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In Reply to: RE: Bias on Manley Snappers posted by fin1bxn@msn.com on February 16, 2017 at 06:42:10
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.
"The piano ain't got no wrong notes." Thelonious Monk
Follow Ups:
I had a local guy fix them after I fell on one and poped some tubes and puff of smoke. I live in NJ so shipping to manley would be $100's just for shipping let alone the time in transit and repair time. The guy did a good job within 2 weeks no shipping and repaired them, I had some old tubes that I had him put in. Sounded great when I got the amps back I then ordered new tubes so I didn't check the bias before inserting the new tubes.
So tonight I'll switch back to the old ones he used to see if its the new tubes
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