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RE: Soviet 6s3p-ev and EC86 Compatibility

Posted by Spantou on January 10, 2021 at 11:58:46:

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?)