Sitting in Columbus, Indiana watching a video about a locally made radio. Can't beat it. Very surreal. My coworker just advised me that he worked at the 17th St Arvin plant (he was making auto parts for Cummins, also local) in the 1990's and while cleaning parts racks during the summer shutdown he found an office behind one of the massive shelving units. The door was sealed-shut from years of paint ...but not locked. The office was full of examples of the car parts, pumps, televisions and radios that were built there. He was afraid his boss would order everything removed and thrown away like all the other "old Arvin stuff" so he closed the door and replaced the big parts rack. The building still stands. Not sure about that room.
My grandmother got my grandfather this Radio from Montgomery Wards in about 1958-1960 I cut the lawn for them in summer and I was aloud to listen to the single rock station KQEO at that time. I can hear Booby Vinson now. Amazing Radio.Thanks.
I have the same radio, the smaller one on the right at the beginning; barely works though. That's a good diagnosis and demonstration on the AVC, thanks for sharing that. KNX is awesome in it's over-poweredness. I'm in Northern California, near the Oregon boarder and many years ago in the evening I'd pick up KNX and listen to the KNX Drama Hour. They were dependable as could be; a decade could go by and you could tune in at 9PM and it was still on. Then they got a new program director and he give the Drama Hour the axe. :o/
Oh, believe me, we would miss many of you...just not Holly Weird. When I was in high school, a friend gave me one of those. He got rid of it because it ate batteries real bad. I looked it over internally, then poked around with a VTVM...ooops, just dated myself there...Dang! I coulda swore I shut this thing off. I checked the switch again. It was off...but that solder bridge shorted right across it. It had to have left the factory that way. Anyway, I used that radio for years...then sold it to a friend who just had to have it. Think he still has it. Great vid, BTW. Thanks for limberin' up my nostalgia bone(8-). I was thinkin' of adding a resistor there...with a switch and mark it "distant" when the switch unhooks the resistor...and "local" when the switch is made. Got a decade box? Park right under that tower and pick a value(8-).
Love those boonies shots, takes me back to Arizona, where we used to head when the snows o winter threatened us. Sadly now this is our second year of staying up in South Dakota to care for mom who turned 93 back in March. We will be taking her out of the home tomorrow so she can enjoy the turkey dinner my good wife is preparing as I type. While outside our picture window, winter threaten with cold,snow and wind. It's a coming that is for sure, just a matter of when and how much.
I have two of these also. One has been owned by me since receiving it as a gift in 1963. I have done nothing to it, it still is as hot as the day I got it. The other one was given to me by a friend about two years ago. It has the distortion you speak of. I suspect it is the first IF transistor that is sensitive to overload from the converter. These are pretty hard to work on, but possible.
The local/DX switch is usually a circuit that allows you to select either a narrow or wide bandwidth in the IF circuit. When you narrow the bandwidth, you may lose some fidelity, but you will make the receiver more selective, allowing it to reject strong adjacent signals. It won't really help attenuate an over-powerful station but it will help the receiver to be able to reject that station in favor of weaker adjacent stations. Hope this helps.
It's just a super hot high gain radio. Used to have one a few years ago, and found that it was very close to as sensitive as a GE Superadio and SR2....that's really saying something. Yes, it will overload, but oddly enough a really strong signal won't "swamp" the dial. There's a couple of "Sears"/"Silvertone" radios that use that same circuit.
That's a quasi-complementary-symmetry output stage. The transformer develops out of phase drive to the series connected transistors which operate in class B. Only one conducts at a time through the speaker. Using a "center tapped" connection on the battery is a way of avoiding having both positive and negative power supplies, which is the way this circuit is usually used. All that weirdness to avoid using an output transformer! The driver transformer could also be eliminated by using complementary drivers, IE: one PNP and one NPN.
I am from the UK and I live about 5 miles from two very Hi Power AM transmitters covering the London area. So I know all about overload on old sets and that distortion. Some sets cope better than others I suppose.
Restored Arvin model 87R79 (4 band AM-SW1-SW2-FM) radio. Has mediocre performance though it works now. A challenging restoration. All bad caps in audio section. AM and FM local oscillators were non-functional and had unusal problems. AM osc. had a shorted trimmer. FM osc. had defective front-end transistor. Benefited from your videos and used Russian replacement for the front-end transistor. Thanks for your videos.
Love watching your radio fixes. As far as all this political stuff goes...I cut my cable TV long ago. Now I'm free of listening to all the hate! Why pay $80 a month for lousy cable anyway. I just come to youtube and watch stuff that sparks my interest, like you and others fixing vintage electronics, the stuff that actually lasts a long time. Incidently, I live in a very red state where we just love to tell big government to stay out of our lives. That is, of course, when we're hit with a major disaster, like flooding a few years back. Then the state was BEGGING for the government to step in to PAY. We don't need the government until matters of money come up. I spend more time dusting my TV then watching the thing!
Indeed, when we were nomadic in our RV a few years back, we were down in the South West where over the air TV was the way to go. Our RV had 2 flat screen TV's, one in the living area, the other in the bedroom it had a good digital rooftop antenna and we could get 18 channels. The one we watched most of the time was METV now that those days are gone forever, gone with my wife who passed away last year, I pay for cable and still about all I watch is METV and a local station for the weather report. I never turn it one unless there is some emergency untill 4:00 PM to watch Adam 12 (I am an x cop so they are training film material from my early days on the PD)
The audio circuitry is similar to that used in '60s solid state stereo amplifiers. These used the dual secondary driver transformer and direct coupled output. An example would be the Knight Kit KG870 stereo amplifier.
The Guitologist - California is happy to come & live or join with us here in Australia. LOL I would be much closer to Shango then to do my repairs on stuff. =)
Not really, we lost too many people in the last civil war, let's not start another. If the libs hate America they can just leave, and leave our country alone.
ShysterLawyer, let me translate Mister Hat's comment for you. You're white, educated, believe in the constitution and rule of law. You have no place in the new Communist Amerika
dictare Exactly. That's why the Founding Fathers gave us the Second Amendment. They knew the corruption would slink back in to government. It always does eventually.
We have out 2m and 70cm repeaters on a hot AM tower they are passed through what’s called an isocoupler it’s basically two close tuned loops that couple and pass the signal. Everything beyond the coupler is bonded to the tower and everything on the other side is bonded to ground. In our case it’s just one of the phasing towers so it’s only directly coupled to the AM transmitter at night. So when doing tower work we use a hot stick with a ground wire to ground the tower then clamp a ground on and do work at the isocoupler. Even with the tower not connected to the transmitter it’s got allot of voltage on it you can easily draw a 3” arc and listen to the station!
One of my friends picked up one of these Arvin 9 transistor radios at an antique shop years ago. It looked like the one that you had on the left at the beginning of this video. It was fairly sensitive. However, I did not realize that the only RF tuning is on the antenna. The transformer between the RF amplifier and the converter is just a broadband transformer.
Now that I have watched your video all of the way to the end, I should mention that my friend and I lived in Rochester, NY, and his Arvin radio did a very good job of receiving 740 out of Toronto (it was CBC at the time). In my recollection, some of the strongest local stations, such as WHAM did sound a bit distorted. Perhaps, this radio was meant for fringe area reception, as you suggest. One thing that really surprises me about the voice/music switch on your radio is that the "music" position appears to roll off the highs. That makes no sense to me. The wide IF does not surprise me much. I have an early 1960s transistor radio on which adjacent carrier whistles can faintly be heard at night. When these radios were new, many people were using them to listen to music, and radio stations weren't using the NRSC treble boost EQ that exists today.
If the 80 microfarad on the audio driver transistor's emitter resistor bypass capacitor (almost said cathode resistor, lol) goes open, you will also get really weird "gritty" audio. I think it is because the emitter voltage starts floating around on top of the resistor relative to the base and causing weird feedback. The capacitor is designed to hold that voltage constant. The same thing happens on tube equipment, but they use small value caps that really never go bad. Earlier designs used resistor networks & the filter choke right off the rectifier to generate negative grid bias relative to a grounded cathode.
It would be interesting if you could take some other transistor radios and maybe even some tube radios (battery tube radios, or maybe take an inverter with you in your car) to document how well their AGC/AVC is able to cope with a very strong signal. Are tubes or transistors better in this regard? I heard that altering the bias on transistors does not significatly alter their gain the way it does on tubes. Is that true?
As a South Dakotan who used to winter in Arizona, I can tell you, if California separated, I would stand on the bridge of the Colorado River and wave goodbye with a cold beer in my hand to celebrate!
I had a similar radio like that one .. It FE overloaded on the strong stations .. some had a distance (RF gain) switch, that you could turn off/down for strong stations …
I think the middle can was intentionally tuned off a little bit, from factory, to reduce distortion. (This is a common thing, primarily the factory tunes the cans for minimum distortion). The other Arvin radios shown probably still have the middle can tuned off a little bit. Because you have peaked it, it will perform better for DX than the other two.
This begs the question...why didn't manufacturers put an AGC loop control on these to manually adjust sensitivity when moving from urban to rural areas?
Shango, I bet adding a “tuner gain” pot on the radio would make it really awesome. Having it accessible to the user through the case would make that a killer radio. Why not do a mod video on how to do this. Love your videos.
Bipolar transistors don't really intrinsically AGC much, so this radio may be close to normal. The better ones use an extra AGC diode to conduct and swamp out some signal.
I would try to change DC bias (by R2 or R3/R4) of RF transistor to change RF gain. Even if the signal is not distorted on RF stage output, it can be high enough to cause clipping in next stage - converter. You can check whole IF part without AGC loop if you put 455kHz with AM modulation to converter and measure AF output on detector. Output signal (and so the gain) must be similar for all 3 radios .
Finished the vid finally. Try changing that cap to ground on the AGC feedback loop? Looks to me like if that cap is leaking to ground it could throw things off.
You know theirs a technique used in Radio to suppress excessively strong radio signals using full wave diode clamping on the antenna, so that extremely strong signals do not over saturate the IF first stage, but the clamp does not effect the weaker signals at all. 2hf low capacitance diodes will do the job it is a simple fix, and saves sacrificing a good high gain radio.
Might be understanding if you would compare one of these days 1 of those radios like that to put in Germany and transistors assure that it versus the nitchie Khan and see how much more sensitive and receptive would be and which way would be better
What it does when batteries are unevenly discharged? The side with higher voltage will draw more current, mainly the idle bias, so even the voltages out...
There is no provision in the U.S. Constitution for a state to secede from the Union. Even if California *did* break off, they would have to renegotiate their water rights from the Colorado River. There would be dire consequences for agriculture in the Imperial Valley, as well as the Colorado River Aqueduct.Then there would be import and export duty fees and tariffs for merchandise that crosses the new international boundary. Then, there is the issue of federal lands, U.S. military bases and other federal assets.
Gregory Malchuk - Shango & Chris are welcome to evacuate to here in Australia if they want, I don’t mind! Least I would be closer to Shango & he can repair/restore my radio. LOL
I also own both of these radios - the 63R58 will have far improved DX performance - it is a 3 gang TRF set with 9 transistor, the 61R58 is just a 2 gang radio, with a RF amplifier - with eight transistors. Both otherwise are near identical 2 IF stages, etc blah blah etc . Hence the difference in performance noted. Both of mine more or less perform like yours do , they are great radios.
I wonder why only Ten-Tec uses the Quadrature Sampling Detector for converting the RF down to 455khz or what ever frequency they are going to use where the local oscillator is 4x the required frequency?
They will not last a month if they leave. When the eastern states shut off the water, gas and power, shut off transportation, flight, freight in and out and the US pulls all it's military out, They will be sitting ducks for even the DPRK to attack..
Shango i had a radio similar to this here in the UK cant remember what make it was it had a very high quality rubber surround 4" oval speaker and i tell you what, it sounded better than my hifi no joke! it was incredible, so good in fact i used to plug my synthesizers in to its 5 pin din line input, the sound was bassy as hell and very crisp, my grandad gave it me dont know what the hell happened to it, was in pristine condition as well. but are you supposed to put AC audio through polarized capacitors?
"Yes, California" - A don't know if California would be better off on their own but the other 49 states would be better off if California was on its own. 😮
I don’t know if Norther California would want to leave the USA, But Southern California would be no big loss, I think it would save the rest of the USA a lot of money!
What is the HP model number of the signal generator that you used in this video? I just happened to catch that it goes up to 990MHZ? briefly. ---------------- John A Bellas ---------------------- KC2UVN
They are drying over I know crying my black and lashful I love Barbara Casey Moore's oyster salima puffer Circle, blind all that apply for FAFSA landfill
Long Island has been thinking about breaking off from NY state....do you know how much cheaper the tax's would be if that happened?????? You might me able to get a 1 room apartment for less than 1300$ a MONTH.
I just this week(7.12.19) fixed my copy....and guess what..after 4 hours or more....and after recapping ...and it not working...all of a sudden I find that SOMEONE..else..had the end of the battery tube(the black end) BACKWARDS...and why in the he...............did they make it go both ways is beyond me..but it does..Arvin should have at least made it so it cant be reversed...And how in the world it did NOT burn up the transistors is beyond me.
What is the difference in Voice & Music? We wouldn't care if Cali broke off with the Ignorant Anti-Gun Loons in your leadership! That's my biggest gripe. Our 2nd Amendment is precious!
Jango do you know Texas has the only state in the union other in California that has the right sense to see from the union it was put in there whenever they were in the competition because they ask for the right to at some point if something didn't go their way that they could as well
Wouldn’t it be funny if California broke away from the USA & attaches itself to Australia or near here! Shango you would be much closer to me & you could fix my old radio for me. Hahahaha........As if that would ever happen (California attaching itself to us)!!! But you never know as centuries ago, Tasmania use to be joined to the bottom of Australia & broke off & is still a state of Australia.
before repairs that smaller one was twerko squirkulating ear death via headphones oh mah god! local oscillator just doing whatever. That was worse than moby's tweaker's delight on vinyl and that is also very high pitch and painful, but fixed it's awesome, great japanese little set with good sound and very sensitive. But before oh my god it scratched my brain and I listen to youtube with old school stanton dynaphase 60 broadcast headphones and a proper headphone amp that was yikes lol.
I live in Arizona, and I sometimes work in California. I like the state personally, but I know many who don't. I laugh at my hard leftist business acquaintances who have always lived there that just 'have to discuss politics' with me. They're hard leftist by my standards but insist they're centrists. Forever we've been hearing that the San Andreas fault will eventually cause California to break off and slide into the ocean so I think the rest of the country are used to the idea of California going away, but the politics ensures this 'hope', and the gentrification of places in states to the east of CA that are getting the people from the exodus probably feel the sooner the better. They're tired of the inflation that Californians bring with them, and also the dumb politics that they support and try to elect in their new home states that drove them out of the CA to begin with. Thus the assumption of low IQ. I know most Californians think they're smarter than everyone else in the country but frankly we feel the opposite about that.
Oh, I often wondered about that, a massive country made up of 50 states are they all happy ? have any considered going it alone ? what be the reaction of the other states if one did wanna break away ?....I'm from a United Kingdom thats on shaky ground and thats only bloody four of us !!!....cheers.
Speaking from middle America, yes we would be happy to see California leave and take all the celebrities with it. Some of the dumbest laws and regulations we have originated in/for California.
Sitting in Columbus, Indiana watching a video about a locally made radio. Can't beat it. Very surreal. My coworker just advised me that he worked at the 17th St Arvin plant (he was making auto parts for Cummins, also local) in the 1990's and while cleaning parts racks during the summer shutdown he found an office behind one of the massive shelving units. The door was sealed-shut from years of paint ...but not locked. The office was full of examples of the car parts, pumps, televisions and radios that were built there. He was afraid his boss would order everything removed and thrown away like all the other "old Arvin stuff" so he closed the door and replaced the big parts rack. The building still stands. Not sure about that room.
@5:03 Gotta love the cute little CONELRAD symbols, 640 on the top of the tuning scale and 1240 on the bottom.
My grandmother got my grandfather this Radio from Montgomery Wards in about 1958-1960 I cut the lawn for them in summer and I was aloud to listen to the single rock station KQEO at that time. I can hear Booby Vinson now. Amazing Radio.Thanks.
These radios sound great! Especially that first one.
Viewer tip: If you listen with headphones you can hear everything much better. ;-)
If you don't mind bloody ear drums...
I have the same radio, the smaller one on the right at the beginning; barely works though.
That's a good diagnosis and demonstration on the AVC, thanks for sharing that.
KNX is awesome in it's over-poweredness. I'm in Northern California, near the Oregon boarder and many years ago in the evening I'd pick up KNX and listen to the KNX Drama Hour. They were dependable as could be; a decade could go by and you could tune in at 9PM and it was still on.
Then they got a new program director and he give the Drama Hour the axe. :o/
Oh, believe me, we would miss many of you...just not Holly Weird. When I was in high school, a friend gave me
one of those. He got rid of it because it ate batteries real bad. I looked it over internally, then poked around with
a VTVM...ooops, just dated myself there...Dang! I coulda swore I shut this thing off. I checked the switch again.
It was off...but that solder bridge shorted right across it. It had to have left the factory that way. Anyway, I used
that radio for years...then sold it to a friend who just had to have it. Think he still has it. Great vid, BTW. Thanks
for limberin' up my nostalgia bone(8-).
I was thinkin' of adding a resistor there...with a switch and mark it "distant" when the switch unhooks the
resistor...and "local" when the switch is made. Got a decade box? Park right under that tower and pick a value(8-).
Nice repair. Those Arvin radios do have nice sound.
You are right, I wouldn't doubt that vote does go through in California. Crazy.
Those are my favorite transistor radios.
I have a couple for sale and several small ones
Love those boonies shots, takes me back to Arizona, where we used to head when the snows o winter threatened us. Sadly now this is our second year of staying up in South Dakota to care for mom who turned 93 back in March. We will be taking her out of the home tomorrow so she can enjoy the turkey dinner my good wife is preparing as I type. While outside our picture window, winter threaten with cold,snow and wind. It's a coming that is for sure, just a matter of when and how much.
long life to AM! :) love its sound
I have two of these also. One has been owned by me since receiving it as a gift in 1963. I have done nothing to it, it still is as hot as the day I got it. The other one was given to me by a friend about two years ago. It has the distortion you speak of. I suspect it is the first IF transistor that is sensitive to overload from the converter. These are pretty hard to work on, but possible.
This video is a good example of why some radios have a local/DX switch!
xraytonyb I'm confused. Isn't the AGC supposed to prevent this overloading on strong stations? what does the DX switch do?
The local/DX switch is usually a circuit that allows you to select either a narrow or wide bandwidth in the IF circuit. When you narrow the bandwidth, you may lose some fidelity, but you will make the receiver more selective, allowing it to reject strong adjacent signals. It won't really help attenuate an over-powerful station but it will help the receiver to be able to reject that station in favor of weaker adjacent stations. Hope this helps.
It's just a super hot high gain radio. Used to have one a few years ago, and found that it was very close to as sensitive as a GE Superadio and SR2....that's really saying something.
Yes, it will overload, but oddly enough a really strong signal won't "swamp" the dial.
There's a couple of "Sears"/"Silvertone" radios that use that same circuit.
That's a quasi-complementary-symmetry output stage. The transformer develops out of phase drive to the series connected transistors which operate in class B. Only one conducts at a time through the speaker. Using a "center tapped" connection on the battery is a way of avoiding having both positive and negative power supplies, which is the way this circuit is usually used. All that weirdness to avoid using an output transformer! The driver transformer could also be eliminated by using complementary drivers, IE: one PNP and one NPN.
shango, no truer words ever spoken about Californication.
I am from the UK and I live about 5 miles from two very Hi Power AM transmitters covering the London area. So I know all about overload on old sets and that distortion. Some sets cope better than others I suppose.
I knew some people that worked in that Columbus Arvin plant a long time ago. That town used to have manufacturing galore.
My sister was into these punch card deals, many of them gave away Arvin AM and AM/FM Radio's as the prize.
You are brilliant, your RUclips channel is very informative, thanks you
Restored Arvin model 87R79 (4 band AM-SW1-SW2-FM) radio. Has mediocre performance though it works now. A challenging restoration. All bad caps in audio section. AM and FM local oscillators were non-functional and had unusal problems. AM osc. had a shorted trimmer. FM osc. had defective front-end transistor. Benefited from your videos and used Russian replacement for the front-end transistor. Thanks for your videos.
Love watching your radio fixes. As far as all this political stuff goes...I cut my cable TV long ago. Now I'm free of listening to all the hate! Why pay $80 a month for lousy cable anyway. I just come to youtube and watch stuff that sparks my interest, like you and others fixing vintage electronics, the stuff that actually lasts a long time. Incidently, I live in a very red state where we just love to tell big government to stay out of our lives. That is, of course, when we're hit with a major disaster, like flooding a few years back. Then the state was BEGGING for the government to step in to PAY. We don't need the government until matters of money come up. I spend more time dusting my TV then watching the thing!
Indeed, when we were nomadic in our RV a few years back, we were down in the South West where over the air TV was the way to go. Our RV had 2 flat screen TV's, one in the living area, the other in the bedroom it had a good digital rooftop antenna and we could get 18 channels. The one we watched most of the time was METV now that those days are gone forever, gone with my wife who passed away last year, I pay for cable and still about all I watch is METV and a local station for the weather report. I never turn it one unless there is some emergency untill 4:00 PM to watch Adam 12 (I am an x cop so they are training film material from my early days on the PD)
Brilliant it's a double feature Monday
Alltop Notch - YAY
I own one! Just a really nice radio, well built with nice audio.
Oh Hell go ahead and have a political rant, refreshing to hear a Californian who isn't a Disney Character.
There are plenty of us out here. Don’t let the media mislead you.
Never seen an output like that very interesting.
The audio circuitry is similar to that used in '60s solid state stereo amplifiers. These used the dual secondary driver transformer and direct coupled output. An example would be the Knight Kit KG870 stereo amplifier.
I hope California votes to leave. It would be the best thing to ever happen to the rest of us. Nice diagnosis, by the way.
The Guitologist - California is happy to come & live or join with us here in Australia. LOL
I would be much closer to Shango then to do my repairs on stuff. =)
Not really, we lost too many people in the last civil war, let's not start another. If the libs hate America they can just leave, and leave our country alone.
That makes zero sense.
ShysterLawyer, let me translate Mister Hat's comment for you. You're white, educated, believe in the constitution and rule of law. You have no place in the new Communist Amerika
dictare
Exactly. That's why the Founding Fathers gave us the
Second Amendment. They knew the corruption would slink back in to government. It always does eventually.
We have out 2m and 70cm repeaters on a hot AM tower they are passed through what’s called an isocoupler it’s basically two close tuned loops that couple and pass the signal. Everything beyond the coupler is bonded to the tower and everything on the other side is bonded to ground. In our case it’s just one of the phasing towers so it’s only directly coupled to the AM transmitter at night. So when doing tower work we use a hot stick with a ground wire to ground the tower then clamp a ground on and do work at the isocoupler. Even with the tower not connected to the transmitter it’s got allot of voltage on it you can easily draw a 3” arc and listen to the station!
One of my friends picked up one of these Arvin 9 transistor radios at an antique shop years ago. It looked like the one that you had on the left at the beginning of this video. It was fairly sensitive. However, I did not realize that the only RF tuning is on the antenna. The transformer between the RF amplifier and the converter is just a broadband transformer.
Now that I have watched your video all of the way to the end, I should mention that my friend and I lived in Rochester, NY, and his Arvin radio did a very good job of receiving 740 out of Toronto (it was CBC at the time). In my recollection, some of the strongest local stations, such as WHAM did sound a bit distorted. Perhaps, this radio was meant for fringe area reception, as you suggest.
One thing that really surprises me about the voice/music switch on your radio is that the "music" position appears to roll off the highs. That makes no sense to me.
The wide IF does not surprise me much. I have an early 1960s transistor radio on which adjacent carrier whistles can faintly be heard at night. When these radios were new, many people were using them to listen to music, and radio stations weren't using the NRSC treble boost EQ that exists today.
740 is listenable frequently here northeast coast. Evenings and overnight. Usually fades away midnight or after.
I miss Rochester. Upstate New York is beautiful beautiful!
I don't blame the cat. My ears were loosing it.
If the 80 microfarad on the audio driver transistor's emitter resistor bypass capacitor (almost said cathode resistor, lol) goes open, you will also get really weird "gritty" audio. I think it is because the emitter voltage starts floating around on top of the resistor relative to the base and causing weird feedback. The capacitor is designed to hold that voltage constant. The same thing happens on tube equipment, but they use small value caps that really never go bad. Earlier designs used resistor networks & the filter choke right off the rectifier to generate negative grid bias relative to a grounded cathode.
It would be interesting if you could take some other transistor radios and maybe even some tube radios (battery tube radios, or maybe take an inverter with you in your car) to document how well their AGC/AVC is able to cope with a very strong signal. Are tubes or transistors better in this regard? I heard that altering the bias on transistors does not significatly alter their gain the way it does on tubes. Is that true?
Remember the 6 transistor radios? Wow!
As a South Dakotan who used to winter in Arizona, I can tell you, if California separated, I would stand on the bridge of the Colorado River and wave goodbye with a cold beer in my hand to celebrate!
long time ago I heard tell of an actual switch on a radio , called it DX-local or something weird like that
Been wanting one of these!
I think you should restore the desert find 1955 RCA TV set.
you're right. we wouldn't mind
I had a similar radio like that one .. It FE overloaded on the strong stations .. some had a distance (RF gain) switch, that you could turn off/down for strong stations …
I think the middle can was intentionally tuned off a little bit, from factory, to reduce distortion. (This is a common thing, primarily the factory tunes the cans for minimum distortion). The other Arvin radios shown probably still have the middle can tuned off a little bit. Because you have peaked it, it will perform better for DX than the other two.
Very cool videos thank you sir!
This begs the question...why didn't manufacturers put an AGC loop control on these to manually adjust sensitivity when moving from urban to rural areas?
Arvin insdusteries was based out Columbus Indiana . I remember we once had a Arvin tv yrs ago & a radio
Shango, I bet adding a “tuner gain” pot on the radio would make it really awesome. Having it accessible to the user through the case would make that a killer radio. Why not do a mod video on how to do this. Love your videos.
How about adding an audio in cable, or sticking a bluetooth receiver in there and calling it "arvin"
You have gained 5000 new subscribers in a years time.
7:20 . . . Dogs started barking all over the neighborhood.
"I ain't superstitious, but a black cat crossed my trail...."
Sonic Servant!
jsciarri - That’s right! & don’t you forget that either. Hahahaha
Bipolar transistors don't really intrinsically AGC much, so this radio may be close to normal. The better ones use an extra AGC diode to conduct and swamp out some signal.
Escape from LA... the prequel!
I live in the town that made these
The Engineers who designed that Arvin should have put a wider swing on the AGC. It would have made it perform with excellence in all locations.
I assume the HP Sig Gen uses a OCXO? They are super stable even after years of service.
I would try to change DC bias (by R2 or R3/R4) of RF transistor to change RF gain. Even if the signal is not distorted on RF stage output, it can be high enough to cause clipping in next stage - converter. You can check whole IF part without AGC loop if you put 455kHz with AM modulation to converter and measure AF output on detector. Output signal (and so the gain) must be similar for all 3 radios .
Finished the vid finally. Try changing that cap to ground on the AGC feedback loop? Looks to me like if that cap is leaking to ground it could throw things off.
You know theirs a technique used in Radio to suppress excessively strong radio signals using full wave diode clamping on the antenna, so that extremely strong signals do not over saturate the IF first stage, but the clamp does not effect the weaker signals at all. 2hf low capacitance diodes will do the job it is a simple fix, and saves sacrificing a good high gain radio.
I think you can use this only for FM. For AM you get distorted signal on strong local stations.
Good point !
Might be understanding if you would compare one of these days 1 of those radios like that to put in Germany and transistors assure that it versus the nitchie Khan and see how much more sensitive and receptive would be and which way would be better
Good stuff here, shango.
What it does when batteries are unevenly discharged? The side with higher voltage will draw more current, mainly the idle bias, so even the voltages out...
Allegro biz.com/bus sir Gregor Global blue hope sign or die my mom I'm a lemur Miami
There is no provision in the U.S. Constitution for a state to secede from the Union. Even if California *did* break off, they would have to renegotiate their water rights from the Colorado River. There would be dire consequences for agriculture in the Imperial Valley, as well as the Colorado River Aqueduct.Then there would be import and export duty fees and tariffs for merchandise that crosses the new international boundary. Then, there is the issue of federal lands, U.S. military bases and other federal assets.
Chet Pomeroy it will be a mess, actually they pay more in federal taxes than they take in.
The cancer has to be amputated. Hopefully we can evacuate Shango and Chris east when the secession goes through.
Count me as joining the California revolution until dumpo is thrown out.
Gregory Malchuk - Shango & Chris are welcome to evacuate to here in Australia if they want, I don’t mind! Least I would be closer to Shango & he can repair/restore my radio. LOL
Nobody wants a repeat of what happened between 1861-65. Besides, it would be a complete disaster for the Democrat Party in the other 49 states.
10mf bypass would make a great remix
I also own both of these radios - the 63R58 will have far improved DX performance - it is a 3 gang TRF set with 9 transistor, the 61R58 is just a 2 gang radio, with a RF amplifier - with eight transistors. Both otherwise are near identical 2 IF stages, etc blah blah etc . Hence the difference in performance noted. Both of mine more or less perform like yours do , they are great radios.
Good video, thank you!
I wonder why only Ten-Tec uses the Quadrature Sampling Detector for converting the RF down to 455khz or what ever frequency they are going to use where the local oscillator is 4x the required frequency?
sounds good, nice video
I used to have one with that same squeal and thought it was interference. If I had known how to do that easy fix.
You could probably get WBZ 1030 Boston at night on that one! Must have good DX capabilities.........
you are very sharp kid keep it up ok you are like me
calexit good riddance
They will not last a month if they leave. When the eastern states shut off the water, gas and power, shut off transportation, flight, freight in and out and the US pulls all it's military out, They will be sitting ducks for even the DPRK to attack..
Tom Kelly - Wouldn't have to change the national flag either if PR ratification is ready. :)
Which capacitor(value also) could I change to get more treble out of this radio...using the center music setting?
Shango i had a radio similar to this here in the UK cant remember what make it was it had a very high quality rubber surround 4" oval speaker and i tell you what, it sounded better than my hifi no joke! it was incredible, so good in fact i used to plug my synthesizers in to its 5 pin din line input, the sound was bassy as hell and very crisp, my grandad gave it me dont know what the hell happened to it, was in pristine condition as well. but are you supposed to put AC audio through polarized capacitors?
"Yes, California" - A don't know if California would be better off on their own but the other 49 states would be better off if California was on its own. 😮
Hope you are safe from the fires.. how about filming some of that for us?
Shango: “I can’t be bothered to align the IF” . . . spends 4 hours aligning the IF . . .
Aside from the aircraft noise, how's the air down there today. Will you have to evacuate?
Cool Radios has for the other thing with your state.........
Take care Shango.
That squealing may be interference from your computer/phone/camcorder.
I don’t know if Norther California would want to leave the USA, But Southern California would be no big loss, I think it would save the rest of the USA a lot of money!
Ask Uncle Doug about spots of white paint sometime! :) (54:33)
cannot find the interview a localtv made to you, 1ts video, was it deleted?
What is the HP model number of the signal generator that you used in this video? I just happened to catch that it goes up to 990MHZ? briefly. ---------------- John A Bellas ---------------------- KC2UVN
I think it#s the 8656b
What does he do with all the radios and TV's he fixes? Is it just for fun?
They are drying over I know crying my black and lashful I love Barbara Casey Moore's oyster salima puffer Circle, blind all that apply for FAFSA landfill
@ 26:50, “Team” by Iggy Azalea. LOL funny hearing that on AM. 🤣
Long Island has been thinking about breaking off from NY state....do you know how much cheaper the tax's would be if that happened?????? You might me able to get a 1 room apartment for less than 1300$ a MONTH.
I just this week(7.12.19) fixed my copy....and guess what..after 4 hours or more....and after recapping ...and it not working...all of a sudden I find that SOMEONE..else..had the end of the battery tube(the black end) BACKWARDS...and why in the he...............did they make it go both ways is beyond me..but it does..Arvin should have at least made it so it cant be reversed...And how in the world it did NOT burn up the transistors is beyond me.
What is the difference in Voice & Music? We wouldn't care if Cali broke off with the Ignorant Anti-Gun Loons in your leadership! That's my biggest gripe. Our 2nd Amendment is precious!
Agreed.
We'd need Shango066 however!
7:15 LOL! Tea's ready! 6:50 a.m.
One question though shango, WHERE ARE THE TVS
Synthematix - Good one. Hahahaha
I would love to buy those Arvin radios ? For sale ?
Jango do you know Texas has the only state in the union other in California that has the right sense to see from the union it was put in there whenever they were in the competition because they ask for the right to at some point if something didn't go their way that they could as well
But RUclips can I identify that I'm content ID of the hyper squeal always That's the only good thing about it
Wouldn’t it be funny if California broke away from the USA & attaches itself to Australia or near here! Shango you would be much closer to me & you could fix my old radio for me. Hahahaha........As if that would ever happen (California attaching itself to us)!!! But you never know as centuries ago, Tasmania use to be joined to the bottom of Australia & broke off & is still a state of Australia.
It's cool by you can listen to the fake news and the real news lol I hear you I have several radios I would like to sell
before repairs that smaller one was twerko squirkulating ear death via headphones oh mah god! local oscillator just doing whatever. That was worse than moby's tweaker's delight on vinyl and that is also very high pitch and painful, but fixed it's awesome, great japanese little set with good sound and very sensitive. But before oh my god it scratched my brain and I listen to youtube with old school stanton dynaphase 60 broadcast headphones and a proper headphone amp that was yikes lol.
I live in Arizona, and I sometimes work in California. I like the state personally, but I know many who don't. I laugh at my hard leftist business acquaintances who have always lived there that just 'have to discuss politics' with me. They're hard leftist by my standards but insist they're centrists.
Forever we've been hearing that the San Andreas fault will eventually cause California to break off and slide into the ocean so I think the rest of the country are used to the idea of California going away, but the politics ensures this 'hope', and the gentrification of places in states to the east of CA that are getting the people from the exodus probably feel the sooner the better. They're tired of the inflation that Californians bring with them, and also the dumb politics that they support and try to elect in their new home states that drove them out of the CA to begin with. Thus the assumption of low IQ. I know most Californians think they're smarter than everyone else in the country but frankly we feel the opposite about that.
Oh, I often wondered about that, a massive country made up of 50 states are they all happy ? have any considered going it alone ? what be the reaction of the other states if one did wanna break away ?....I'm from a United Kingdom thats on shaky ground and thats only bloody four of us !!!....cheers.
Speaking from middle America, yes we would be happy to see California leave and take all the celebrities with it. Some of the dumbest laws and regulations we have originated in/for California.
If you are a mile from a 50Kw transmitter I would not be surprised to find that you pick up KNX with the fillings in your teeth.
Lets see if Canada will let California become a forth Territory.
You can get KNX in your teeth fillings in the South Bay.