How to fix a dead Vintage Gibson BR-3 Tube type guitar amp No sound yet lights up, Test & repair
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- Опубликовано: 24 июл 2024
- Another all time classic hits the bench of D-lab electronics. This one comes from a fellow in Wyoming. He has sent me quite a few fun projects over the years. We attempted repairing this one over e-mail, but didn't work out. Turned out to be a shorted filter cap. Took out the High voltage to the preamp section. After a partial restoration, the amp sprang back to life. These Gibsons are a joy to work on, plenty of room inside. Lucky the realist ate allowed for installation of a custom capacitor turret board. The BR-3 is ready for many new years of service. Fun project!
Хобби
Hoping for a Christmas miracle that you'll post a ham radio repair.
From Leo: I think I am going to make every old amp customer listen to the last 2 minutes of your video. You are 100% right. The "original mojo" was never 50-75 year old defective, out of spec parts. The original mojo was all new, quality parts. No magic in defective components.
Your friend was lucky not to burn out the transformer, which is common when one or more capacitors short-circuit.
Interesting the 2 resistors of 50k connected in the coupling transformer, aiming to soften the natural resonance of the transformer.
Thanks Terry for sharing your knowledge.
A box of "technician lubricant" is always appreciated! Well done Carlos! Merry Christmas Terry, Marcia, Shortwave Girl Emi, and the entire family!
Very interesting circuit. It just cracks me up when I see some of these older amps that use transformers and chokes because it was cheaper than tubes and resistors and capacitors back then. It boggles my mind.
I wish you were in the UK, because then I could send my Crate Stealth 50 to be firmly sorted out.
Thanks for sharing as always Terry. Merry Christmas to you, your lovely wife and Tony Tone!
A little vintage tube amp knowledge and wine of course always wins the day. I like how you replaced the original can, and a component (or two where needed) with electrolytic capacitors on a board that fits in the chassis perfectly.
The topside looks original and untouched when finished.
Yes Sir, That was my intension. Great little amp!
Analog man in a digital world - I love it and I am with you on that one man! Thanks for what you do. Merry Christmas to all of you, stay safe but not necessarily sober!
Thanks Terry. Love your videos. Merry Christmas!
As an 1980's trained EET I can identify as a "Analog man in a digital world".
Excellent fix as always Terry. Good thing that Cap didn't take out the transformer... great demo and fix my friend.
Terry, you giving us what you can is a lot. Thanks. Merry Christmas.
I've never seen such a high-value B+ resistor ever (1 MEG!)
Nice work, T!
Awesome job elegantly fixed!
Merry Christmas!!
Thanks Terry, happy holidays to you and your family.
That's a sweet little board... very handy. I like the idea of interstage transformer, don't see that all to often in guitar amps. Good job!
Merry Christmas D-Lab hope you and your Fam have a nice Holiday. Thanks for all your videos.
Cool amp Terry...Great info, and information and instruction..Top video as usual...Go Terry Go..Ed..UK..😀
Fantastic Terry! I did notice it looks like the white wire from the 120 volt AC line is attached to the fuse instead of going directly to the primary of the power transformer? I know I always nit-pick because the subject of this repair is to get the amp running and usable, which as per usual you did a great job! Those new D-Lab boards are really gonna change how you do things. I just felt like it is a safety issue. You probably get annoyed with me about little things like this, I don’t blame you! Maybe I saw it wrong? You have a lots of customers and friends all over the country and world! Love you and am ALWAYS excited when you post a tube amp video. Happy Holidays to all especially to Marsha &Terry. Love from cold and snowy NW Colorado. Thanxz
Nice job
Awesome seeing this. Your knowledge is priceless! I love seeing this because there is now way in hell I’d be doing this… lol. It’s just super interesting
Aloha : Pretty Simple Circuit .. Thanks for the Share " Peace "
Big Hugs!!
Man if i were to live in the us i would be your apprentice
What an ODD tube layout! That output tubes are practically rubbing up against each other!
Personal note to self: never drink bourbon while working on tube amps.
nice t-shirt
Super Repair! Don't know why, but it seems like it has to be pointed out over and over, Get rid of these old leaky caps. For the people who like the interstage transformer, remember the sound of the amp is only as good as the transformer, and while it's response is probably good in the guitar range, over all it is probably poor. Tubes are cheaper and have a much better frequency response.
Nice job Terry. What material do you use for the board holding the filter caps? Thanks.
They are US Military made by ArJay
Another interesting video, Terry. The only problem I have is that hum at 12:45. Do guitarists accept that hum along with their music?
they did 50 years ago.
What's with those green crayons?
An output transformer screwed on the speaker? To me, it's rather very unusual. That bias resistor is too high, at 63.7 mA for a pair a 6V6s it will run the power tubes too hot.
I'm in favor of taking the old caps out entirely.
Delayed notifications...wot th"
Geez Terry, I thought it was transformers. What a letdown. If you think you're going to repair amps plastered after drinking that hootch, think again. I think we all should get your wife involved 😏, and not to help open those bottles. haha-lol🤣🤣😂
Is that all you can do on a guitar. Ah G cord. Goofy sun of ah gun Terry ur OK. in my book.
Dwight. Allenpark,Mi. Under Detroit.
I can't remember the last time you had a useful video. Maybe it makes clicks but not from me. It's had to have been better then a year. Sorry but unsubscribe. Maybe I'll catch something interesting from you in my suggestions but no longer from my subscriptions
really