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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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In Reply to: RE: Question About 4P1L Kit Filament Bias PSU Circuit posted by KevinC on April 2, 2016 at 16:16:33:
Thanks, Kevin.//The fil bias pad isn't used for a directly heated filament.//
Ok, makes sense.
What is C2 doing?
//The filament is the cathode, so the value of the cathode resistor and the B+ voltage determine the cathode voltage (and the cathode current). I haven't read that particular document, so I don't know specifically what Rod is referring to, but with the values of B+ and cathode resistor I have used, I get a cathode voltage of about 8V-9V, positive relative to ground.//
Which is exactly what Rod shows in his diagram in that document. Similar cathode resistor values too... But the -9V bias he mentions is confusing. It's just for my intellectual understanding since I'm building away happily anyway...
Edits: 04/02/16
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- RE: Question About 4P1L Kit Filament Bias PSU Circuit - Cappy 16:33:39 04/02/16 (0)
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