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Paoli Model 60M help
Paoli Model 60M help
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Old 2nd January 2018, 05:55 AM   #11
Eli Duttman is offline Eli Duttman  United States
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The 6550B was superseded by the 6550C. Very sadly, the St. Petersburg, Russia, plant that made those tubes is defunct. Be extremely cautious about buying any of the remaining stock of those tubes, as they rate to be problematic from both a performance and cost perspective.

A stock Dyna MK3 runs just fine with KT88s. The "reissue" Gold Lion (GL) KT88 is excellent. The overall quite decent ElectroHarmonix (EH) KT88 is less costly than the GL, but comes up a tad shy in the bass extension dept.
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Old 2nd January 2018, 01:13 PM   #12
theurbanshaman is offline theurbanshaman  United States
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Thanks, Eli, for the heads-up regarding 6550B tubes. The NOS pairs I purchased about a year ago were rebranded with the "Billington Gold" label and had test values penciled in on the box. I do have a quad of EH 6550s that I could swap out from another amp to try. Then there is still the question of bias setting for 6550s in the Dyna Mk III/Paoli 60M.
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Old 2nd January 2018, 05:41 PM   #13
skidave is offline skidave  United States
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Paoli Model 60M help
What was the resolution to the original 4 ohm output problem?
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Old 2nd January 2018, 08:31 PM   #14
theurbanshaman is offline theurbanshaman  United States
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Truth be told, skidave, I shelved the amps for a while, brought them back out to use with 8 ohm speakers, and when I tried the 4 ohm output it magically was working!
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Old 3rd January 2018, 04:52 PM   #15
crispycircuit is offline crispycircuit  United States
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A christmas gift?
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