Rare Brownface 1962 Fender 6G6A Bassman.....in for a Tune-Up
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- Опубликовано: 4 окт 2024
- In this video we will thoroughly explore a 1962 (or 1963) Brownface Fender 6G6A Bassman amplifier, with emphasis on creation of an adjustable bias pot and in-depth discussion of both NFB circuits and the Fender Presence Control. An audio demo is presented at the end of the repair segment. In addition, we will be visited by some kitties, a 1932 Ford Roadster, and a very special guitar.
If you enjoy our no-ad-revenue videos, please SUBSCRIBE to our channel and consider supporting our work by becoming a Patreon Patron at / uncledougsvintageamps or by making a PayPal donation to: dldcam@aol.com. Regardless, thanks for watching :) 
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NOTES:
1.) The second triode in the Bass channel is a cathode follower, which does not invert the signal, therefore the two channels are out of phase.
2.) The NFB loop connects, not only to the PI cathode, but also to its lower triode grid.
3.) The Bass channel not only did not have more gain that the Normal channel, but its signal tended to have more treble frequencies, at least with guitar input.
4.) At around 17:40 the lower range for he adjustable bias pot should be 22K......not 28K.
5.) The clipping seen in the 3rd audio demo tune was due to an incorrect input-level setting on the digital recorder.....not due to the Presence Control.
6.) For our English viewers: The "Boot" is the trunk and the "Bonnet" is the hood. Sorry ;)
I'm a tech suffering from a mental illness, and I feel like utter shit almost all the time, but your videos always seem to make my day a little better. You're brilliant, and I thank you from the bottom of my heart.
I'm sorry to hear of your suffering, LM......but glad that our videos help. We wish you the best.
Jack is looking so kingly atop his kitty palace. Thanks for showing us your babies
He definitely rules the roost, Austin. The pleasure was all ours :)
The yellow 1932 Ford Coupe is RIGHT ON THE MONEY!
Congrats Uncle Doug.
Your videos never fail to make me laugh. 💪🏻💪🏻
Thanks, Shade. Glad you enjoy them :)
@@UncleDoug
I’m so honored you replied.
I have this 135W amp which u posted quite a while ago.
ruclips.net/video/Q6YJfWCi_uE/видео.htmlsi=pd93uQXQzju00UtI
The reverb is indeed lacking a push and I will try to attempt with your recommendation of a 25uF/25V bypass cap.
Thanks
I remember when you modded that front end. A true master! 🤠🤘
Thanks. I added the finned disc brake covers just recently :)
Out here in youtube land, we are always enthralled to find another offering from our favorite uncle.
We hope to be able to continue video production for many more years, SBE ;)
Thanks as always UD, this channel is a gem of the internet. We appreciate it.
Thanks for your kind words, K.
Lonely Is The Night. Nice! Very nice!
Yes, indeed. Thanks :)
I’m in full agreement. This old key banger would love to jam with Uncle Doug. Maybe Jack can solo on Cat Scratch Fever?
Given sufficient catnip, Jack would solo on Flight of the Bumblebee, Mike :)@@mikegraves6070
I love the sound of the 6g6 circuits. The 6g6b is still my favorite fender sound.
this channel Sure has it for vintage sound doesn't it! I found my dream amp is a 63 vibroverb thanks to Unca Doug!
We can see why, Aaron.
Thanks, Gao :)
I very much enjoyed your video. Nice work. What made me comment was your comment that you hate adverts during videos. Id like to agree with you on that and I have to say that adverts are the one thing that drive me nuts. I actually believe adverts have become counter productive. Nobody likes being hustled into buying something they dont need or want.
Thanks, Shea. I am so disgusted by the barrage of advertising we are overwhelmed with on a daily basis that I make a mental note to refrain from buying any product or service they offer.
It always lifts me up when I hear so much Tom Petty in your final demos. Keep it up Doug!
Glad you enjoy them, Thomas. Will do :)
Uncle Doug, I just hafta say, IMHO your vids provide the most entertainment and
the highest quality of teaching bar none...
and I dunno if it's just me but your teaching technique just keeps gettin' better
dear brother, thanx so much (!)
Thanks, Jonny. That's great to hear :)
A '62 Bassman. I'm drooling.
You have plenty of company, Paul :)
❤️Love your back, keep up the great work. You make me smarter. Caster n camber. I went to car collage in the 80s. Never worked on cars. Took after my dad n worked on pa. Guitar etc. My brother had a 37 Chrysler with a 327 in Chevy big jurnal I hopped up for him. You bring back lots of good memories 🙏❤️
Thanks !! That's good to hear, 300 :)
Uncle Dough, your videos are very therapeutic. THANK YOU.
You're welcome, CM :)
That knowledge, that voice. Another great video! Thanks!
Wow....glad you enjoyed it, PS.
thats great work. im a hot rod guy as well i currently have a 1963 impala 2 door hard top factory 327 car. ive had two 63 chevy2 , a 53 2 door chevy, 72 chevelle, 69 chevelle. my impala got parked about 10 years ago. it was an everyday driver but i had a monster heroin addiction 100 dollars plus a day I couldnt afford the gas so i parked it. ive been clean for 11 or 12 years now thank God for that. so ive recently been cleaning the impala up wanna start her up soon but i got a few things to take care of first because she been sitting for a few yeas without starting. anyways great looking car
Thanks for sharing. Best of luck with your resuscitation of the Impala :)
Wow. That SG looks "factory fresh". Amazing condition.
Thanks. The owner has had it for around 40 years.
Two shockers - that beautiful Ford Coupe, Oh my, don't sell that! and then the '64 SG - you NEVER see them in that condition, my word, you live in Heaven sir!
I surely hope these videos give you as much pleasure as we get from them - you are great educator.
Thanks so much, Prince. Glad you enjoyed it :)
Only correction I would make was the name on the pink slip of that sweet ride . Your awesome Uncle Doug ! Appreciate your ant bite sacrifice and glad to see Jack and Ollie didn't suffer the same threat . ( I don't need no cliff hanger , I'll be here ) God bless .
Thanks :) Likewise on the blessing.
Thank you very much Uncle Doug! That demonstration of the unique and beautiful functioning of the brown face era presence control was a real public service to guitar players everywhere!!
Glad you enjoyed it, C8 ;)
your fail safe design of the negative feedback is very good. not a tube guy but im learning! thank you, professor Doug!
Glad you liked it, MB :)
The sudden cut to the deuce caused a re-direction of blood flow, gorgeous! Thank you for showing the amp too. :)) Whipping out your junior at the end was the piece de resistance.
Apparently you aren't as old as I am, Andrew, or the re-direction would have been minimal ;) Thanks so much :)
Bourbon and a good ole U D vid ...Life is good ...Thx Nice Hot Rod too ...
Amen, some Pappy Van Winkle and a good cigar :) Thanks, Ed.
Even your voice makes me relax : ) ... What a great Channel!!!
Thanks, Alex. Glad you enjoy our videos :)
Jack is living high on the hawg lol. Great video Uncle Doug. Kudos..!
Yes, he is, Fid. Thanks !!
You'd think that as a DEVOUT disciple of UD I would know exactly what he means when he speaks of jumpering the two channels. Alas I do not. Prob not a topic for an entire vid? It has been a long time since we've had an instructional video though...Wonderful, as always. Thanks UD!
It's a common practice among those seeking the ultimate in output power and tone to jumper the two channels together so both are pre-amplifying the input signal, W1.
That was the boot. Great video!!!
Yes, it was, William. Thanks :)
I love uncle doug. I love jack and Ollie. I love fender amps. I love rusty. I love hotrods. I love everything about this channel.
Wow.....Thanks, R400 :)
Sweet looking Ford there, Doug!
Thanks, GL :)
Another video from my favorite Uncle on my 55th birthday of all days. Today is a great day!
Happy Birthday, VTA, and best wishes for many more :)
The world is a much better place thanks to Uncle Doug making videos.
Thanks so much, BB. Having great viewers helps a lot also :)
Looking forward for that Supro. Thanks uncle Doug for this magestics pieces!
You're welcome, Dino. Stay tuned :)
Love the car and work you did so magnificently. Custom cars and custom amps! Great job Uncle Doug!
Thanks, Ralley. Glad you liked it!
Wow...love the Hot Rod......
Thanks, OMW :)
You have a fabulous sense of styling. What a beautiful ride, Professor.
Thanks, Y :)
Greetings Uncle Doug and the Hep Cats! This video gets a four star rating! A classic jewel of an amp, a magnificent hot rod, an amazing rare guitar and the new "Uncle Doug 'Sweet Spot' Bias Circuit." We couldn't ask for more but we also get the patented Uncle Doug humour patter and the adorable kitty-cat shenanigans! Make that six stars! Cheers!
Wow....Thanks so much, IR......six times !!!
Great tune up and diagnosing love your hot rod and Jacks Castle,that SG junior is a beauty,Cheers!and stay cool Daddy-OH!
Thanks thrice, BJG :)
Love the hotrod Mr Doug. Enjoy
Thanks, OG :)
Fantastic video! looking forward to that ride in your hot rod!
Thanks, Ty. See you then :)
Greetings Uncle Doug. I really like the Bassman Amps.
Likewise, Sarge :)
Another great day it’s gonna be when UD uploads. Thanks for the hard work and dedication you put in the videos.
You're welcome, KC. I hope you enjoy our efforts :)
Indeed it is. My other weekly highlights are Workshop Wednesday from the Australian armour and Artillery Museum and Loudspeaker upgrades from Danny Richie at GR-Research.
100%! Great ride a long on first class repair of Brown Fender gold
Thanks Doug!
Our pleasure, Chris :)@@chrishoffman6537
another great video! finally a detailed explanation of the nfb circuit and the presence circuit!! thanks,
Glad you enjoyed it, Michael.
Cheers, Doug.
Likewise, Tony :)
Another "Evening of pure entertainment", courtesy of the GOAT. Thanks, UD!
We hope you enjoyed it, Jeb.
Always dig ur vids uncle Doug...I can wait for the scratch build...I anticipate it's arrival 😮🙏🤘
Thanks, N. We are working on it as we speak.......so stay tuned :)
@@UncleDoug 🤩
Looks like a show winner. I mean amps guitars and cars…all in one video. Who could ask for more. Thanks Uncle Doug.
Glad you enjoyed it, Kim :)
That car is beautiful. Great work - I really love the front end
Thanks, HBC :)
Jacks new palace looks like something Escher would be proud of......
Yes, indeed.....go up the down staircase ;)
I always liked Cragar wheels.
What a great intervention with this amp, a trove of trade secrets were dispensed and assimilated. Thank you!
Glad you enjoyed it, PMD :)
That Ford is SHARP! The Bassman is pretty cool too.
Thanks twice, AE :)
A) Excellent B) ROD - unrool & C) Presence demo - loved it. Thank you sir.
You're thrice welcome, Ray :)
Great video again. Love the ROD and learned new stuff, what's not to like.
Glad you enjoyed it, Pat.
I enjoyed the video section with your car!
I'm glad, Noel :)
Wow Doug, nice ride! Thanks for the video mate!
You're welcome, AJ :)
Again a grate video. We always learn from your videos. We build tubes amp here in India. Under guidance of eletra print (jack elliano) and we make opts and much more. Specially all transformers.
Thanks for sharing.
Thanks for joining us, K :)
I like your custom designed bias supply.
Glad you like it, RB.
Great video Uncle Doug, bravo 👏
Glad you liked it, Peter.
I love the hotrod updates! Yes, that yellow does the trick!!!
Thanks, Greg :)
Fabulous Doug!
Thanks, Mr. SM :)
Double header! Gorgeous ‘32, Classic Bassman. Made my morning. Thanks Jack, U. Doug! Edit: triple header…64SG Jr!
You're welcome, Brian. Glad you enjoyed it :)
Really enjoyed your car!! Looking forward to see the next video!
Thanks, Marcelo :)
Great video Doug , your car is just beautiful Mark
Thanks twice, Mark :)
Gorgeous car as well!
Thanks, Mr. SM
Oh my gosh that 32 Ford is so carefully done. Beauty execution Doug.
Thanks, Brian :)
beautiful hot rod Uncle Doug, oh and the amp is pretty sweet too!
Thanks twice, FM.
Great video Uncle Doug, hope Jack is frisky and feeling good.
Thanks, Scotty. He varies between running wildly from room to room.....and sleeping in the laundry basket :)
Great video as usual thank you uncle Doug
Glad you enjoyed it, James :)
Another great video! Thank you Doug :)
Glad you enjoyed it, Milo :)
Great video as always, thank you Uncle Doug :)
My pleasure, Ard :)
Superb SG Uncle x
Glad you liked it, CL :)
With that yellow hot rod you do such profesional work. I dont like yellow on a car. But it does look good on that hotrod the hood bonnet side covers
Look realy good on it what a job nicely done Uncle doug.
Thanks, Dwight.
You are THE teacher Sir! Thank you very much. Amazing as always... hats off to you.
Thanks so much, Pero.
It was gentle and probably after at least 3 dates 😅 ..and in front of the sticker!
Ok, back to the vid 😂
Thanks Doug
Edit: Stunning ride! So much to love but the chain link shaped front spring mounts are so cool.
Glad you enjoyed the video, P3 :)
I'm sure Jackie loves the wonderful new ease of access to your shelving, should he
experience any kitty kitty boredom or mischievous inclinations...
...and Elvis sez HI!
It's his fortress of solitude, especially when Mitzy is looking for trouble ;)
I was going to break in the house and steal the amp, but I don't think I'll make it past the garage!! Thanks for bringing us along!!
I thought I heard some scratching on the door ;)
Great video--amp, guitar and car !!
Thanks thrice, Mr. CC :)
Hi . U.D.! I was given a 69 Bandmaster Reverb head several years ago. I built a cab for it. Im in the process of learning through your videos how to take care of it and work on it. Thank you so much for sharing your wealth of knowledge!
You're welcome, Ben. That's great to hear. Continued good luck with your education and amp repair projects.
Hey Uncle, was wondering if you and the family were ok as I hadn't seen any videos for a while, then I see 3 in the last few weeks! Me and Hattie (my shop lion) happily watching. Beautiful amp, and the Ford?!?!?! Wow! Stunning. By the way, in England, the 'trunk' is known as the 'boot'. Thanks as ever for your company and wisdom
Thanks for your input and your concern, Nick. We're doing quite well indeed :)
Goodnight Mrs. Calabash wherever you are.
Jimmy !!!
Wow,UD! You’re on a roll ,lately! Those ‘64 SG Jr’s are one of the best guitars for rock n roll ever made. Pure resonance and sustain! Beautiful Bassman as well. I don’t know a lot about cars but I love the color!Can’t wait for the next video!
Thanks for all the nice comments, William. Stay tuned ;)
3:26 it has been molested , but it was gentle and it was probably at least after three dates 🤣 you crack me up Uncle Doug. Great technician/ repairman/ engineer with a wicked sense of humour. Thanks for the great repair. PS throw that death cap at the CA Electrical Safety Boards Chairman will you 💥
Glad you enjoyed our video, Mr. P. Consider it thrown ;)
Hi uncle Doug. Thanks again for posting wonderful information on tube amp repair and mods to help protect xformers and tubes. Awesome hot rod you been working on. And Jack’s Taj Mahal is awesome too! Take care.
Thanks so much, VHM :)
great video - as always
Thanks, Bobby :)
nice car, love the color
Thanks, MC :)
And greetings to you Uncle Doug.
Likewise, SHW :)
You are very deserving of such a wonderful Hot Rod . Enjoy that bad boy. I often wonder how many amp builders would credit you with inspiration and knowledge.. you are the man , Doug
Wow, thanks, SBE :)
Another outstanding video from RUclips's favorite uncle, Uncle Doug. Thank you.
Glad you enjoyed it, ES :)
What a beautiful car! I love the yellow. The Teflon spacers on the leaf spring is a great idea. I took the rear leaf spring apart on my old Triumph Herald and added Teflon tape between the leaves. Quieted things down and a bit smoother. Much better than oiling the spring 😮
Thanks, Y4. Agreed, the Teflon does not attract dirt and grime.
Dear Uncle Doug, the RA stamp on the doghouse is a return authorization. Apparently in 1963 the amp was returned to the fender factory for warranty repair.
Wow.....that's an interesting tidbit, Dan. Thanks !!!
Love your Ford. Very first car I ever rode in was my dad's 1949. I was two years old. Very first vehicle, was about a 1944 Ford truck. Saw one a few years ago on Julington Creek Road and had to hunt it down. Turned out to be a wedding caterer's truck that was COMPLETELY original except for tires (including holes in the THICK fenders. Regards the Blonde Bassman ... I remember those when they were brand new. The Classics' second bassist, Talmadge Branch had a '61 or '62. I remember him climbing up on it and doing the twist as my brother climbed up on his 1960 PRO and the lead guitarist, Walter Eaton, climbed up on top of his brownface Concert. Leo built 'em good. BTW: Not sure what the Presence control does for a bass amp ... seems like that handles the very upper highs ... Not much bass notes climbing up that high! I think they just used the BandMaster framework and beefed up the BASS channel. I have a '62 BandMaster and leave the Presence control all the way down ... but I mostly play Fender guitars. My SG Standard and 355 might enjoy having a bit more ultra high top end ...
Thanks for sharing this with us TT.
G'day Uncle Doug,
Thanks for another great video. I've enjoyed watching your videos, & look forward to new posts.
Your '32 looks great. As a "gent" who's just turned 60, I was pleased to hear that you're enjoying the radical solid roller cam that's been fitted. I've had a few hot cars & bikes, & plan for more in the future. It's good to know that I'm not the only one. LOL
I also liked the SG Jnr. I have a soft spot for single pickup guitars, but only own 1 Epi LP Jnr. It's a 2nd hand, & little dinged up, so I'm not too worried about putting on the back of my bike when I go shopping for pedals. I will to restore it one day, & update it a little.
Anyhow, thanks once again for your video. Keep up the good work.
Andrew
Greetings, Andrew. We're glad you enjoyed the video and wish you the best.
A visually stunning, and educational episode. This amp was well considered to contrast the individual circuits offered by Fender in the 60's. The audio demo gave great levity to the substantiation of the presence affect to the high-mid register. The 32' Ford is something to be proud to own. The restoration exhibits the same care as you approach to electronic repair. That being said, the car is bittersweet for me. My visual impairment has forbade me from driving. I had to retire from being a touring instrument tech in the 80's. I can appreciate the significant aspect to modified motor cars. However, I begin to remember my disability, and how it has left me never knowing the pleasure of driving any car. I did not mean to drag the room down. I hope that 32' brings you many years of pride, and enjoyment. I agree with you on that shade of yellow. Thank you for posting, uncle.
Thanks for all the very nice comments, Alex. We're sorry to hear of your vision issues and wish you the very best.
Great work and demo by the cats on that Baseman. Glad you’ve got a Highboy Deuce lined out and most appropriate for hauling all of that master maintained vintage music gear.
Thanks, Lane. I guess I'll need a trailer :)
An unexpected extra with that Ford hot-rod :)
I'm glad you enjoyed it, T.
Hi Uncle Doug! Another great video to learn me up ! l really like your NFB circuit.Great addition to a vintage amp. The hot rod interlude was a pleasant surprise , looks very nice.
Glad you enjoyed it, Chris :)
Ahh! Another nice Uncle Doug video! Satisfying for the mind like a steak dinner is for the stomach! - with sweets too in the form of a street, err sweet machine! Well done mate! 😃👍💯! The only thing you forgot was showing me the engine & takin it for a drive! But yeah hehe, later huh?
Bassman sounds great of course after you've waved your magic conjerings & special sauce upon it! Your bias mod is well thought out & executed, & did I see texta marks on the pot for postion marking? - good idea. Stephe at Skunkie Designs found sorta 'lockable' pots from somewhere, with a split nut that tightens around the pot shaft itself, to secure the adjustment. A spanner can be used on it, keeping all but the most serious knob twiddlers at bay. Muffin knobs lol! 🤣
Nice, matched New 6L6's for it, so life doesn't get any better than that!
Beaut new feedback switch now used in conjunction with the presence control, for more sound & breakup flexibility. Gotta love that! Sweet old guitar too!
Thanks for showing your 32 Ford, ain't she purdy! Purdy perfect from what I saw mate. Project complete! (Are they ever though?). Lubly louvres! Black soft top is a striking contrast. Exhaustive but beautiful detail work underneath & front suspension sheesh! 🤪
Big boy 9 inch nothing but the bestest ay? The finned punkin cover is breathtaking, & what a perfect match with those front brake inlets! Gorgeous! A show stopper mate!
The only things I'd change is to maybe blacken that lower panel behind the grille, but definitely I'd put the guards back on! Almost entirely cos I'm not as brave as you with those exposed wheels! A bit of a wus I spose, oh well.
But the car would look great too with all the guards on too though wouldn't it? I reckon it would. The 32's probly had the lairy long, curved guards & running boards didn't they?
You've got yourself an absolute gem there uncle Doug, & it's not unreasonable to expect the quarters of the 383 to be no less a knockout! Looking forward to part 2 of the '32!
Thanks for all the very nice comments, Neville. I am considering painting the lower panel behind the grill shell black. As it is, it shows the bugs and is somewhat distracting.
In Sweden it isn’t allowed to sell electronic devices without fuses, so every amp from 50’s and onward have fuses installed, even on 6.3 volt supply. And polarity or ground switch and death cap always removed! It’s nice
That sounds like a good policy to me, K.
Keep going, Doug. I understand more and more each time you make a video. 👍
That's good to hear, Andrew. Will do :)
Very nice job on the amp, cool car and mean little axe! That's all you need right there!
You got that right, AQ. Thanks !!