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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: Separate Cathode Rs for PSE posted by Naz on May 28, 2012 at 22:11:18:
Hi Naz - you use PSE a lot I think? The whole issue of fixed bias for me is a difficult one - I tried several types and all of them seemed to degrade the high frequencies. The best I could come up with was Schottky diodes and a couple of CR stages, the last cap being polypropylene. I thought even that was audible in the highs. I didn't go into tube rectification and choke input.
So I remain to be convinced about fixed bias!
With cathode bias, I only use polypropylene caps - electrolytics are horrible.
With small tubes I use filament bias. Seems to be the best solution - small cathode resistor. All the tubes I use are DHTs, and I use Rod Coleman's filament supplies.
andy
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Follow Ups
- RE: Separate Cathode Rs for PSE - andy evans 00:36:14 05/29/12 (1)
- Fixed Bias can be done in so many ways - Naz 01:09:39 05/29/12 (0)
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