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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: referencing DC heater to B+ posted by jarthel on March 27, 2007 at 05:36:14:
Jarthel
It doesnt say whether its an amp or preamp but I will assume a preamp.Is this a circuit you have in your preamp or whatever or is it one you want to build? The reason I ask is,its silly to source filament voltage to the B+ just to save using a filament transformer and a couple diodes and caps as some designs do.It is ok to source the above ground dc voltage for the filament for a hum solution but it seems this design is sourcing the dc filment voltage as a cost or space move.
The big reason Im saying this is the filament voltage should be stable and not vary IMHO..The eico hf87 for instance had its filament voltage for the 12ax7 sourced from the cathode of one of the el34s. I had built the amp doing away with circuit and had gone to a fixed bias.
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Follow Ups
- Re: referencing DC heater to B+ - Michael Samra 07:56:12 03/27/07 (1)
- the 12V PSU box in the image represents... - jarthel 14:25:25 03/27/07 (0)
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