Brownface Fender Princeton and Silverface Champ "Double-Header"

In this video two amps will be inspected, repaired, and tested: a mint 1961 Brownface Fender Princeton and an equally nice Silverface Champ. Several different problems are encountered, including the all-too-common scorching hot bias of the Champ's 6V6 and a weak tremolo in the Princeton. Hopefully, the repair methods will be instructive.
Working on old, classic amps like these always presents an ethical dilemma: do we preserve originality at the expense of safety, proper function, and reliability......or do safety and functionality justify the replacement of original components? I guess it all boils down to whether you want a pristine display piece......or an amplifier that functions like new, for a reasonably long time. Only the owner can decide.
If you enjoy advertising-free videos like these featuring classic vintage tube amps, then please subscribe to our channel and consider becoming a Patreon patron at: / uncledougsvintageamps or making a PayPal contribution to [e-mail]. Thanks !!
If you are interested in obtaining a custom amp cover, please contact Joel Thomas: [e-mail]

[@UncleDoug]

NOTES: 1.) Because of their low PC and imbalance, the GE 6V6's were replaced with a matched pair of EH's. The GE biasing was retained in the video for instructional purposes. 2.) The Champ video was abbreviated due to time constraints. More work was done. 3.) Although the Princeton schematic show 30/30/30uf filter caps, the circuit actually contained 20/20/20uf.

[@NotMarkKnopfler]

You re-coned the cat? Your amp addiction is getting out of control!

[@wegert1]

I have a quite a few miles on me as well. And, as I've aged, I've noticed that I've ceased to be able to emit electrons at the same rate that I once could...

[@wilson4180]

I love the irony of a Brownface amp serial number starting with P00.

[@michaelmerritt1722]

I enjoy that you stick with repairing amps. Others get too political. You have great humor and I enjoy your pets, Jack and Ollie, plus drone flights as an added bonus. Keep up the great work Uncle Doug!

[@soloridertv]

I call those protective collars that cats get to wear when they have had surgery the "Cone of Silence". She walked off saying, "How could you show me on your video wearing this stupid thing?"

[@bluesingmusic3443]

That amp is absolutely PRISTINE. I don't remember amps looking that good back in the early 70s. Wow. What a treat. I'm amazed at that amp.

[@williambock1821]

Back when K.C. was still dealing with the “Cone of Sadness” :-( She’s happy NOW tho!! 🕺🕺🕺😺😺😺😺😺🕺🕺🕺🕺

[@HeliBenj]

A new video from Unc' Doug, the day just got a whole lot better

[@ThePreyMantas]

LOL :) Jack & Olly remind me of Wilson on Tool Time, but never see these guys. Come to think of it we never see you either! LOL

[@DeadKoby]

8:00

[@JoelzombieThomas]

Thanks for the plug on my amp cover at

[@boboala1]

Uncle Doug...I think you're funny! Uncle Doug...I think I love you for educating me and having compassion for stray beasts - Hi Casey! Uncle Doug...I think you been in the woodshed...was that ZZ 'Have Mercy' at

[@boctok55]

UD, you are truly fortunate for getting to work on such fine historical specimens of the tube amp world. Thanks for allowing us to experience it vicariously!

[@chaimatepimolviriyachart1560]

Great work and very details! Thank you so much for sharing Uncle Doug!

[@Andy_Yates]

KC with the cone of shame. Loving the progress she is making and always appreciative of your fun and educational content!

[@thomasburnett4712]

Wow! A double header with 2 of my favorite potential build projects! Thanks Uncle Doug!

[@buzzawuzza3743]

Really glad to see the owner of that beautiful Princeton taking such good care of it, Uncle Doug.

[@sam127001]

Thank you for sharing your knowledge , techniques and experience with us !

[@pbrom99]

Uncle Doug, I started playing guitar in the early sixties and played through many of the classic Fender amps when they were fairly new. I have tried just about every amp on the market over the years and to my ears nothing beats the old Fenders from the late 50s thru early 60s. Thank you so much for sharing your knowledge with us. It is incredibly interesting to to see you walk through the circuits and explain how they work. Please keep the videos coming.