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In Reply to: RE: Soviet 6s3p-ev and EC86 Compatibility posted by erik on January 10, 2021 at 09:31:02
Yes. If pins 6 and/or 8 were connected to the cathode for the 6s3p, then the EC86 should not have worked from the beginning, meaning that 6&8 are unconnected. My understanding is that EC86 oscillates easily and the three connections (2,6&8) for the grid was one measure to suppress that, but two of those connections are now unconnected in your setup when you use EC86, if our assumption is correct for how the socket is wired..
We are just guessing, but one theory is that "hiss" is caused by oscillation due to a connection that previously worked, but became oxidized or "dirty" recently, probably pin 2.
Checkout exactly how the sockets are wired, clean the sockets and pins and let us know if the problem persists with the EC86 (on the one channel only, correct?)
Glad you got the problem fixed.😊 Sorry the problem was apparently in a "black-box" module that you can't access.
They already fix it. The noise-canceling module called Vimala (the ones that have Flohbaum printed on them) was responsible for the left channel malfunction. They have them plenty in stock, which makes me believe this is a common problem, nobody's talking about it because of the resale value. Can't be sure, of course.
Thanks Spantou, at the moment the pre is at Audioadvisor, hopefully they'll do the job right. But when it's back, I'm going to investigate its wiring, I've been in contact with quite a few owners of this unit, and everybody's using ec86 without problems.
The pins and sockets are clean, before I sent it for repair, I cleaned everything and tried a brand new set of the original tubes with no luck. I hope they'll fix it this month.
Will let everybody know about the results.
Attaching a couple of pic for fun
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