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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: low 12AX7 filament voltage in my Fisher X-100-A amp posted by microbe on December 2, 2016 at 22:55:38:
I have that situation on my Scott 272 but I'm not getting the DC voltage for the filaments off the output tube cathodes.The voltage was a series string giving me 7.2vdc on pins 4 and 5.
In your case,do what Jim and Eli said with a little torroid.You you can even put the preamp tube filaments on the DC string depending on the size of your filament transformer you get.
Keep in mind that it isn't unusual to find one tube's filament brighter than another even of the same tube brand.Measure the filament resistance of each 12AX7 and get them as close as you can.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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Follow Ups
- RE: low 12AX7 filament voltage in my Fisher X-100-A amp - Michael Samra 18:14:54 12/03/16 (0)
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