Rare Brownface 1962 Fender 6G6A Bassman.....in for a Tune-Up
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- Опубліковано 18 вер 2023
- 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 :)
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.
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 :)
Thanks as always UD, this channel is a gem of the internet. We appreciate it.
Thanks for your kind words, K.
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 ;)
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 ;)
Wow. That SG looks "factory fresh". Amazing condition.
Thanks. The owner has had it for around 40 years.
Uncle Dough, your videos are very therapeutic. THANK YOU.
You're welcome, CM :)
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 :)
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 :)
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
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.
ua-cam.com/video/Q6YJfWCi_uE/v-deo.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
That knowledge, that voice. Another great video! Thanks!
Wow....glad you enjoyed it, PS.
You have a fabulous sense of styling. What a beautiful ride, Professor.
Thanks, Y :)
❤️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 :)
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 !!!
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 :)
Even your voice makes me relax : ) ... What a great Channel!!!
Thanks, Alex. Glad you enjoy our videos :)
That car is beautiful. Great work - I really love the front end
Thanks, HBC :)
Goodnight Mrs. Calabash wherever you are.
Jimmy !!!
Love the car and work you did so magnificently. Custom cars and custom amps! Great job Uncle Doug!
Thanks, Ralley. Glad you liked it!
The world is a much better place thanks to Uncle Doug making videos.
Thanks so much, BB. Having great viewers helps a lot also :)
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.
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 :)
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
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 :)
Looking forward for that Supro. Thanks uncle Doug for this magestics pieces!
You're welcome, Dino. Stay tuned :)
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 🤩
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 :)
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 :)
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 :)
Jacks new palace looks like something Escher would be proud of......
Yes, indeed.....go up the down staircase ;)
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.
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 :)
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.
A '62 Bassman. I'm drooling.
You have plenty of company, Paul :)
Great video Doug , your car is just beautiful Mark
Thanks twice, Mark :)
A) Excellent B) ROD - unrool & C) Presence demo - loved it. Thank you sir.
You're thrice welcome, Ray :)
another great video! finally a detailed explanation of the nfb circuit and the presence circuit!! thanks,
Glad you enjoyed it, Michael.
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 :)
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 ;)
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 :)
This is going to be a tremendous benefit to my day (or night). Thanks for continuing to make these!
Our pleasure, Sean :)
Oh my gosh that 32 Ford is so carefully done. Beauty execution Doug.
Thanks, Brian :)
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 :)
I love the hotrod updates! Yes, that yellow does the trick!!!
Thanks, Greg :)
You are THE teacher Sir! Thank you very much. Amazing as always... hats off to you.
Thanks so much, Pero.
Great video again. Love the ROD and learned new stuff, what's not to like.
Glad you enjoyed it, Pat.
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 :)
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 :)
Wow Doug, nice ride! Thanks for the video mate!
You're welcome, AJ :)
Great video Uncle Doug, bravo 👏
Glad you liked it, Peter.
That Ford is SHARP! The Bassman is pretty cool too.
Thanks twice, AE :)
Great video; I learned a lot. Thank you for taking the time to make the video and to give explanations with rationales for your work!
Thanks. You're welcome, Mike :)
Sweet looking Ford there, Doug!
Thanks, GL :)
Another outstanding video from UA-cam's favorite uncle, Uncle Doug. Thank you.
Glad you enjoyed it, ES :)
Another fabulous repair. You are a real master at your work Uncle Doug. What a beautiful car enjoy it.😊
Thanks, User. Will do :)
Another "Evening of pure entertainment", courtesy of the GOAT. Thanks, UD!
We hope you enjoyed it, Jeb.
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.
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 :)
Great video as always, thank you Uncle Doug :)
My pleasure, Ard :)
Keep going, Doug. I understand more and more each time you make a video. 👍
That's good to hear, Andrew. Will do :)
Wow Doug! Perfection personified! Great sounding amp with thoughtful upgrades, a fast hotrod race car with a built motor and a wraptail SG/Junior without the damned string anchor block! Love the Jack Condo! Always good to see your videos!
Glad you enjoyed the video, Willy :)
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 :)
Another very cool video UD - - loved all of the work that you put into the amp, loved the sound demo and I especially enjoyed the timeout to check out your latest hot rod work of art - absolutely beautiful in every single way - certainly enjoyed you pointing out some of the various mods you pulled off too, including the paint job - for sure, I'll be looking forward to going along for a ride - and, goes without saying that I personally enjoy every moment you share of your cats too. Uncle Doug, between you, me and the gate post, in my not so humble opinion, you've got this stuff down - you never disappoint, I always find myself soaking up every word and moment, sometimes going back to insure "I got it". Thank you my friend.
Thanks so much for all your very nice comments, Skip. We really appreciate your kind input.
Jack is living high on the hawg lol. Great video Uncle Doug. Kudos..!
Yes, he is, Fid. Thanks !!
Great video as usual thank you uncle Doug
Glad you enjoyed it, James :)
Great amp tune up and a great car presentation, as always! That car is lovely...wonderful work. Looking forward to the upcoming "auto demonstration" 😎
Glad you enjoyed it, S. Stay tuned :)
Greetings Uncle Doug. I really like the Bassman Amps.
Likewise, Sarge :)
That is a real jewel of Fender Bassman Amps ... I can only imagine what it sounds like through 2 12" JBL speakers that this rare amp came with ...
The Hot Rod & SG Junior are pretty special too ! 🐸
Thanks, Martin. Agreed.....two JBL's would make a huge difference.
Beautiful job on the car Doug, it's stunning!!
Thanks so much, Don :)
Love the hotrod Mr Doug. Enjoy
Thanks, OG :)
Once more excellent video. Very nice car too. This time playing demo has excellent sound quality as well. Perfection.
Thanks thrice, 9W :)
You did a fabulous job on the 32 Ford Doug. Can't wait to see you take it out for a ride. That's probably the cleanest vintage SG Juniors I've ever seen. Congrats on both!!
Thanks twice, Bert :)
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 !!!
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.
That was the boot. Great video!!!
Yes, it was, William. Thanks :)
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 :)
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 enjoyed and learned from this video Uncle Doug. Now I've got the NFB loop down, and I really liked your explanation of adding the bias adj. pot. and thanks for the notes. Your '32 Ford makes me green with envy. My father sold Fords in the '50s and '60s so they're in my blood. Can't wait to take a test drive!
Thanks so much, Tim. Glad you enjoyed the video :)
Fantastic video! looking forward to that ride in your hot rod!
Thanks, Ty. See you then :)
Well presented and well explained! Thanks, Uncle Doug. Oh, and the car is a masterpiece.
Glad you liked the video and the car, Ken:)
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 :)
Cheers, Doug.
Likewise, Tony :)
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 :)
Nice to see some hot rod content back in the vid! Great work as always. I'm particularly fond of the 6G6B Bassmans.
Thanks for your input, GL :)
And greetings to you Uncle Doug.
Likewise, SHW :)
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.
Another great video! Thank you Doug :)
Glad you enjoyed it, Milo :)
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.
I've been using those Redbase 6L6's in my '65 Bandmaster for several years and they're just fantastic... funny thing,I got some Psvane 5881's (Psvane makes the Redbase tubes for TAD) a while back and they appear to be the same tube as that TAD 6L6 lol... don't matter to me,they sound great... always nice to see another vid,Doug!
Thanks for sharing, Rick. So far, they've been a great replacement tube.
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.
Yet another great job! That amp and that guitar were made for each other....really sweet sounding. Thank you and Kudos! Ps..Ollie and Jack have really improved...must be woodshedding a lot when your not around 😉😉
Thanks so much, F-H. Yes, they try to keep an edge on their repertoire :)
So happy to hear you sounding hail and hearty Uncle Doug! What a pleasure to rest my aging bones after a long slog at work with another of your outstanding videos!(and a couple of ales!) Jack's new Taj Mahal looks fabulous and I'm sure he appreciates you putting together his online shopping :P My limited means mean its taking awhile to get the tools I need to start building and repairing circuits(a distortion pedal is my first build, then will pull the DRRI chassis) but the adjustable bias you built sure seems to work great, and I continue to learn and be enriched by your kind instruction! Hey I love cars and guitars too that's one cherry Ford 'Rod you built! --and wow I was drooling looking at Mitzi's mint SG jr..wow what an axe! I'm looking forward to seeing under the hood and test drive of the hot rod and the "scratch build" electronics next time! stay well Uncle Doug!
Thanks for watching and sharing your observations, Gao :)
Fabulous Doug!
Thanks, Mr. SM :)
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 !!
Really enjoyed your car!! Looking forward to see the next video!
Thanks, Marcelo :)
Wow...love the Hot Rod......
Thanks, OMW :)
Thank you so much for all the new content Uncle Doug. Nobody else can do it like you do. That naughty Jackie really has great taste in ordering up his new kingdom behind your back! It's so fantastic that you have given those feral kitties such a great home. My 2 feral kitties are my limit due to my small home an limited funds for all the vet care, food etc, but they are worth every penny an more. Between your expertise on electronics an over the top hot rods you are the best channel there will ever be on UA-cam.
I've had cats and dogs living together in our house before, but my current 3 dog menagerie (sometimes 4 dpgs because we occasionally foster as well) unfortunately won't tolerate cats. I miss the cats I used to have, they were strays that adopted us and they used to sleep with our dogs on the same beds. At the moment our temporary foster dog is a 150 pound St Bernard!
Wow....thanks so much SC :) Regards to your kitties.