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Original Message

Another Snapper owner

Posted by M3 lover on February 16, 2017 at 09:44:05:
Hi fin,

I'm having a different biasing problem with mine - unstable bias. After a brief period the bias in one amp begins to vacillate between about 200 and 450 mV. Manley techs advised 280-320 is the desirable safe range.

I also have 6CA7 outputs. The 12AX7 is the recommended match. Those with EL34 can utilize 12AT7, 12AX7, or 5751.

I took my Snappers to the factory for repair (spending as much on tolls as gas!). They found two other small problems, which they repaired, but no bias issues. Of course as soon as I returned home the problem reappeared. Now I'm waiting for a friend who knows electronics to help with some measurements so I can get back to Manley.

In your case I'd talk with Manley but I'll guess your bias is too high.