OpenTube

Rare Brownface 1962 Fender 6G6A Bassman.....in for a Tune-Up

Uncle Doug

37,145 views

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 Patreon: uncledougsvintageamps or by making a PayPal donation to: dldcam@aol.com. Regardless, thanks for watching :)

20 Comments

@UncleDoug Creator 3 years ago (edited) Pinned

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 ;)

@jonnybeck6723 3 years ago

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 (!)

@bbmade 3 years ago

The world is a much better place thanks to Uncle Doug making videos.

@Kilovolver 2 years ago

Thanks as always UD, this channel is a gem of the internet. We appreciate it.

@soapboxearth2 3 years ago

Out here in youtube land, we are always enthralled to find another offering from our favorite uncle.

@Corporations8MyBaby 3 years ago (edited)

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!!

@knifecollector54 3 years ago

Another great day it’s gonna be when UD uploads. Thanks for the hard work and dedication you put in the videos.

@peroherljevic7323 3 years ago

You are THE teacher Sir! Thank you very much. Amazing as always... hats off to you.

@vintagetubeamplifiers 3 years ago

Another video from my favorite Uncle on my 55th birthday of all days. Today is a great day!

@GregsGarage 3 years ago

I love the hotrod updates! Yes, that yellow does the trick!!!

@y00h0011 3 years ago

You have a fabulous sense of styling. What a beautiful ride, Professor.

@hlfbakedcake6085 3 years ago

That car is beautiful. Great work - I really love the front end

@rb032682 3 years ago

Wow. That SG looks "factory fresh". Amazing condition.

@skullheadwater9839 3 years ago

And greetings to you Uncle Doug.

@PennStacker 3 years ago

That knowledge, that voice. Another great video! Thanks!

@andrewhodgson8895 3 years ago

Keep going, Doug. I understand more and more each time you make a video. 👍

@PrinceWesterburg 3 years ago (edited)

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.