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In Reply to: RE: This Raphaelite Sinovt SM45 went bad after 1 year posted by DAK on April 16, 2016 at 11:01:28
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
Follow Ups:
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.
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