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OddAudio
Добавлен 30 мар 2022
Official RUclips channel of OddAudio Canada, offering affordable hifi and electronics repairs in Calgary, Alberta, Canada.
Attenuate output of your preamp/input of amp the right way: voltage divide with input impedance.
The easiest and best way to passively attenuate the output of your preamp or input of your power amp, without messing up the impedance of the circuit! You just need to know the input impedance of your amplifier and use this to create a voltage divider with a single resistor.
Просмотров: 66
Видео
Cary Audio SLA70 tube amplifier - Some thoughts and my recommended mods.
Просмотров 3565 месяцев назад
An overview of the Cary Audio SLA70 tube amplifier and some of my recommended mods. Use film cathode bypass capacitors. Add AC balance variable resistors in series with the 6SL7 driver plate resistors (not necessary on the Mark I which has a balance pot, but recommended on the Mark II which has no balance control). Run solid state rectifiers - NOTE standard diodes will not have the voltage drop...
Transcriptor Vestigial tonearm ... Finicky over engineering at its finest.
Просмотров 282Год назад
The Transcriptor Vestigial tonearm mounted on an Ariston RD11. A bizarre, delicate, and extremely finicky way to design a tonearm.
Inside the Cary Audio CAD-280SA V12R Tube Amplifier... And a major flaw to watch for!
Просмотров 2,8 тыс.Год назад
My personal tube amp, a V12R F1 edition. I've already done some basic tweaks (doubled the B power supply capacitance, installed my preferred coupling caps, installed HiperFred diodes, replaced the ugly blue LEDs with inoffensive red ones) but in the course of doing so I found a shocking number of factory joints that were not soldered! In the end I found around 10 points that had the wire wrappe...
Inside a Nakamichi Dragon Cassette Deck Transport - Not as exotic as you think!
Просмотров 10 тыс.Год назад
Yes, really. It's basically a classic Nakamichi transport with a 4 track head and auto azimuth motor grafted on. Still, don't mess with one if you aren't familiar with Naks, they are easy to screw up! For the record the CR7 is FAR more complicated and daunting to repair, a Dragon far simpler and more analog than that monstrosity.
Tech Tip: Cleaning Sealed Alps/Noble Potentiometers... Stop drilling holes!
Просмотров 3,7 тыс.Год назад
No need for power tools, cleaning the inside of a sealed potentiometer isn't rocket appliances.
Vacuum tube microphonics demonstration.
Просмотров 675Год назад
A visual demonstration of vacuum tube microphonics using the phono stage I just built for my system.
Yamaha C4 preamp intermittent channel... damned fragile PCBs.
Просмотров 760Год назад
TLDW: an invisible hairline crack through the PCB broke several traces and was causing the right channel to cut out. The boards on this era of Yamaha are notoriously fragile and this one was no exception.
Sansui SE-9 Compu-Equalizer in action!
Просмотров 2,8 тыс.Год назад
Room correction and DSP before I was a thing, with the kind of electro mechanical overcomplication that makes me swoon. The magnificent Sansui SE-9 Compu-Equalizer.
Tech Tip: Crackling noises from your speakers - it might be a ground issue!
Просмотров 1,7 тыс.2 года назад
Do you have erratic crackling noises coming from your speakers? Usually it would be a connection issue or noisy carbon resistors, but not always: it could be a noisy ground! Putting a simple resistor capacitor filter into your ground wire is enough to eliminate it if you are experiencing this rare problem. Typical values for a ground lift RC filter: 47-150 ohm 2 watt resistor in parallel with a...
Sharp VZ-3000 Portable Linear Tracking Dual Side Record Player Boombox
Просмотров 1,2 тыс.2 года назад
When the customer said he had a boombox for repair, this was not what I was expecting.
The inner workings of the Sony PS-F9 Flamingo portable record player.
Просмотров 1,8 тыс.2 года назад
One of the coolest portable record players of all time, and one of the most valuable! A rare peek under the hood of the Sony PS-F9.
Nakamichi 730 Receiver in action. Peak 1970s Japanese overengineering.
Просмотров 2,8 тыс.2 года назад
The Nakamichi 730, one of the coolest and most complicated 1970s stereo receivers you'll encounter. The peak of Japanese overcomplication and overengineering.
Tech Tip: determining the outer foil side of a non polar capacitor, courtesy of Mr. Carlson's Lab
Просмотров 28 тыс.2 года назад
The foolproof way to determine the outer foil side of a non polar capacitor, a technique I learned from Mr. Carlson's Lab. always orient the outer foil to the lower impedance side of the circuit: if it's connected to ground, foil to ground, if it's in a signal path, foil to the previous stage (the source of the signal). Think of it like using the foil as a shield to keep noise and interference ...
Technics SU-V "New Class A" system in operation
Просмотров 2,3 тыс.2 года назад
Showing off the startup operation of a Technics SU-V303 amplifier running their New Class A (aka computer controlled class AB) circuit.
I am continuing to work on a Nakamichi Dragon ( serial number 21XXX ). The cam motor continues to run while in play forcing it to the most counter clockwise position. The VR 603 play pot does nothing in play mode. The VR 603 and cam pot are good. When I first received it the 1amp fuse was blown. I found a bad 1000uF 16v cap. I recapped the logic assembly board. It powered up and the display and transport worked. Transistors Q516/616 are good. The IC603 opamp which feeds the bases of those transistors is putting out 10.14v at pin 1. I was thinking maybe there is bad logic chip that is causing the malfunction? The cam motor continues to run when it should stop after performing each transport function. In stop mode it the cam motor does stop and allows the arrow mark to line up with pointer while adjusting VR 604.
من هم یکی از این مدل دارم که با هیچ چیزی ان را عوض نمیکنم و میخواهم تا اخر عمر ان را نگه دارم 🇮🇷
Good afternoon. I have the same one but one of the motors is failing, the spare part no longer exists, could you tell me the characteristics of the same one so I can find an equivalent one?
what are the white coupling caps you used? Believe the stock caps were SCR, not the greatest sounding cap. tks
Cornell 942Cs I was trying out. They are ok. I usually use Jantzen Superior as my reasonably priced go to, VCap ODAM if cost no object.
@@OddAudioCanada OK, thank you for the added info.
thankyou!,good concise and valuable info, made easy enough to grasp the essential application..😇👍
I have a Revox B215, and its mechanics are on a completely different level. One motor for each movement, no belts, no idlers, no plastic parts, and no auto-alignment system with performance that drifts over time. I feel like buying a Dragon just to prove my point about a machine made of a thousand plastic parts that everyone places on a golden pedestal.
if i had that deck i would just disable autoreverse completely.
exotic AF
just asking as complete noob,,, osc. probe is x1 or x10 set ?! Thanks
1x! You want the highest sensitivity, 10x is ... 10x less sensitive (used for high voltage measurements usually).
my SU-V303 shows Newclass A but the Computerdrive sign remains off, what does this mean?
JASON from Calgary. Canada's version of Jordan Pier.
Tip is valuable but should have been filmed to a higher standard
I have an SLA-30, and my lord, what a design direction change.
Correction: the 2 rectifier tubes are run in parallel, not series.
This is the stereo version right? It must be: everything seems to be doubled...
That technique has been used for decades....
Good tip! Thanks for posting this.
I just saw an ad on "fixing your poop" twice while watching this video.😂
how strange, mine is identical but it's called SU V 505. (??)
Sorry to say it but what a lot of nonsense. 12 output tubes?
terrible noodle work
Ya thank you captain obvious............how about the sealed pot to the left of the super easy one you just did ?
7:30 Member if the head is aligned for one side, both sides are aligned 90 degrees. So it means the 4-track head is ALIGNED both sides.
how many capacitors does this amp has,do you have any recommendations for an upgrade to bust the bass?
The most important are 4 0.22uf coupling caps (signal path). 2nd is 4 power filter caps clamped to the sides, these can easily be doubled in capacitance for the same dimensions.
@@OddAudioCanada i was thinking in replacing the capacitors (4) for Mundorf MCap 1000 VDC SUPREME EVO Silver Gold Cap Capacitor .22 0.22 uf
what filter caps do you recommend? thank you for taking the time to answer me.
I wouldn't bother with Mundorf, I am not a fan... I HIGHLY recommend VCap ODAM, they are by far the best coupling caps I've heard. @@jormoria
I used 1200uf/400V Epcos TDK. They were the same size as the stock 560uf, I think they are 35mm diameter IIRC. @@jormoria
Nice … as I’m watching it adjust back to flat I’m think a few moments latter…
Vintage beauty 😍
The thing is now. Alcohol or Caig Fadr cleaner. I have had good luck with both.
Nicely explained
You must have an open ground on your scope probe to get that kind of deflection.
Can u explain how to change the bulbs?
I am getting the exact same reading regardless of which way capacitor is connected. Ive tried three different types of non polar capacitor including one you showed in vodeo I am not getting any difference at all
ended up using the audio amplifier method where you connect it across mic jack then reverse and see what end is loudest when you touch the body of the capacitor. This tells you which side is the foil side. It was very noticeable with volume cranked up while touching capacitor. Maybe I just don't know how to set up the scope properly but it didn't work for me.
How can I get in touch with you? I have a ps-f9 that need the clamp mechanism rebuilt and I have the new gears.
I've never been able to reproduce these results... probably my own fault for not knowing how to use my o-scope.
That's because your scope is working properly... He must have an open ground if he's getting that much vertical deflection with just an inductive hum from his fingers...
When I was a little, our neighbor had one of these... I absolutely loved it... Have been hunting one fir years.
Really nice. I love my Dragon but, as my other decks, I would never service it myself. Too scared 😂. But the sound is awesome even after over 30 years
Hi!
Thought the whole idea with alps sealed pots is that they are dust proof
Can you open a Sony playstation
If this mattered, it would be on spec sheets
If that would be true itd be wonderful😓
For me, since I don’t have the skills, expertise, or Nak testing tools to repair a Dragon, simple 3 head Sony’s are the best option. They make excellent recordings and you can buy a bunch for the same price as one Dragon.
I remember this one... It also has a FM transmitter to listen to the record straight from the Radio
What do you consider exotic? It’s a cassette deck that automatically adjusts its playback heads, has double locked DD capstans that both switch directions for both sides of the tape, two tape counter mechanisms, and an entire circuit board that runs a little motor that controls the alignment of said heads. I’d say it’s a little more exotic than a plunger solenoid slapping against metal and an Single idler tire running the show in most decks.
I changed the little belt on the drive motor thanks to you. Tysm! Couldn't have done it without this great tut.
I thought that the height moves the head front to back and forth. Height term remained from the days of top loading decks.
Close, it's a front to back angle adjustment. If you imagine the head is pivoting down at the bottom, "height" is the swing back and forth at the top. Azimuth being the angle from the other plane. If you looked at the head from the top height would be moving in and out and azimuth would be twisting it.
@@OddAudioCanada so this basically aligns the tracks on the tape with the tracks on the head?
@@stackoverflow8260 Yes, and Nak treats it as the "track alignment" point. You can also think of it like a coarse equivalent to azimuth, with the fine adjustment being the azimuth. You have to go back and forth between the two to dial them both in, one affects the other. Funny thing about tape decks is that the result will be the tracks crossing the heads at a slight angle in 2 planes, it's not straight up and down the heads like you'd think.
You need to set the icq frequency to 400khz using a counter
So how would I solder a tone cap on a guitar once I have this information?
I reckon : one end of the tone capacitor is connected to ground, usually the back/casing of the potentiometer. You find the "shielding leg" of the capacitor.....THIS is connected to GROUND. 😊
@@vacuumelite2065 Thanks!
Helpful video thanks. Finally got a pot on my phono preamp clean that had been driving me nuts for years
Just before you mentioned the hairline crack, I said to myself - 'there'll be a miniscule crack in the tracks'. Like looking for a needle in a haystack! The best systems are modular design, but I guess we have to pay the extra them.
The performance of the Nakamichi is almost unmatched, but at what cost? - it's so complex inside! As much as I love my cassette decks (and I have many), I can see why some folk prefered reel to reel.
Good video. And nice to see someone who works on Naks but doesn’t over glorify them haha