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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Filaments and filament bias posted by coin on April 15, 2016 at 00:33:37:
"If I have 50v on one end of the filament and 45v on the other, which end counts as the cathode to plate voltage? How does it know the difference?"
As you can see at the VT25 CF schematic, this simple practice centered the filament.
The CF use negative supply (practicaly direct drive to output tube) and "LND150 CCS bias" to adjust via CF tube the output tube bias.
Distortion a bit high, but if you use appropriate CCS insted of R4, the distortion will decrease one order of magnitude.
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Follow Ups
- RE: Filaments and filament bias - euro21 03:19:01 04/15/16 (2)
- RE: Filaments and filament bias - coin 03:27:49 04/15/16 (1)
- RE: Filaments and filament bias - euro21 03:45:39 04/15/16 (0)
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