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In Reply to: RE: How reliable have your SET or SE tube amps been? posted by RGA on April 13, 2016 at 23:37:05
Yeah, not good at all for a 3000.00+ amp. I think Mike Samra commented that the power trans for many Chinese amps have a 110/220 primary. Since USA voltage is mostly +120 that not only puts a strain on the PT but also the power supply components. So, I am still trying to track down a problem with the unit which now does not pass a signal. It went from a distorted signal to no signal. I would say if you are thinking of getting a Chinese made amp you better be sure it is made to operate at 120vac or be ready to spend about the same amount of money for repair jobs down the line. cheers, Dak
Follow Ups:
Many of the amps you buy on Ebay that are made in China,they almost have an extra wait time because they have to modify the AC input to work in the US market.If it was 240vac,there wouldn't be an issue..What some guys are doing are running their amps on variacs which is a bad idea..They aren't stable over time and there can be fluctuations in voltage by as much as 10% or more.You are better off just getting a tapped isolation trafo or getting transformer with the correct primaries.
A friend you get for nothing,an enemy has to be bought
It seems like there is no real damage done to the amp. It looks like the 845 have worn out and need to be replaced. the tube lineup is 12at7 - 2a3 - 845. If the owner subbed a 12ax7 for the at7 would that drive the amp harder? If the ax7 has more gain would not the signal to the 2a3 be more and thus working the 845 even harder? cheers, Dak
"If the ax7 has more gain would not the signal to the 2a3 be more and thus working the 845 even harder? "
Only if he turns it up. (or, to say it the other way around, only if he didn't turn the volume control down to compensate for the added gain of the 12ax7 vs. the 12at7)
Or to say it yet another way, if he listens at the same level as he always did the 845 would not be "worked" any harder.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Hi Tre, the upshot of the whole problem is that i found the bias pot on one amp was burnt out. So, i replaced both pots with beefier AB units and now the amp plays and sounds good. The bias voltage is controllable and works as it should.
I should have mentioned that I would have been seriously bummed if I was the owner of the amp. I am just trying to get it going again. It is a pair of monoblocks so one I got sorted out ok. But the one that doesn't pass a signal is a head scratcher.
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