Selmer TruVoice TV15 (Circa 1950) Guitar Amp. Service and Test
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- เผยแพร่เมื่อ 17 ต.ค. 2024
- Selmer Truvoice TV15. Guitar Amp. Service and Test.
Made about 1950
Fix 2 manufacturing faults !!
Explanation of dangerous non isolated input socket.
The sound was poor due to the manufacturing faults.
But after fixing them, it now sounds alive (in more ways than one), loud and with great tone.
Wonderful lineup of 5 old audio valves (tubes).
U31, KT33C, KTZ63
No isolating transformer. The mains comes straight in.KT33
Explanation of circuit including the Barretter.
Interesting amplifier 👍
Is that "Goodman" speaker original to the amplifier?
Nice looking construction.
About 60 years ago when I was a kid, a TV engineer came round to fix our telly. It was, I now realise, using a similar method of non-earthing and a one of those big dropping resistors. He kindly let me rewire the plug whilst I was watching him work. He didn't half jump when he put his hand on something inside the set when he turned it on. After he recovered he rewired the plug to the correct polarity. I just didn't know and I didn't get blamed. I can still picture his surprise though.
Hi Chris. Good story. Glad it wasn't you who jumped after he had gone.
This took me back to the days when you would hear about musicians and roadies being electrocuted on stage.
I remember when TV's used dropper resistors and engineers would simply tap on a new resistor to make up a broken section.
People were always advised to never open the back due to the possibility of electrocution. Big warning stickers saying live mains wires can cause possible death do not open, but only on consumer electronics.
Love your video. Thank you for posting this. Is there any way to obtain a copy of your schematic.....perhaps a picture of it or copy in some other form? Thinking about my next tube amp project and something like this looks interesting. Could open the door for a battery powered valve guitar amp. Thank you!
Hi. Yes, just email me directly.
I may have forgot to mention that these were made at the time when DC mains supply was common, so it could not use a transformer.
nick@demonproducts.co.uk
The Really Is No SUBSTITUTE For Those Lovely Old Goodmans Speakers, Every Time I Look In My Old Hacker Radios And See Their 8x5 Size I Know Why They Sound So Nice...Lovely Job On The Selmer Truvoice TV15 Guitar Amp Nick, You Really Know Your Stuff When It Comes To Repairing These Old Beauties Regards mike.
Hi Nick, I have a 55 tv15 complete with all the original documents! I'm the second owner but its not working... it is actually a consecutive serial number to one that is documented on a website..
Would it be something you would be interested in looking at for me please? Thanks for the great videos!
Hi, yes, I will have a look at it. Contact me directly: nick@demonproducts.co.uk
amazing how the safety is different
Back in the day did Selmer produce and ship a safer modified version to the States.
Hi Paul
That must be a rare beast to find now. I forgot to mention in the video that one reason for no isolating transformer, is so it could be used with DC supplies, which were still common in the 50's.
I doubt they did.And why would America want one of our amps when it had Fenders,Gretsch,Gibson,Epiphone,National,Kay,Ampeg etc!