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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: Current source filaments posted by Triode_Kingdom on May 1, 2007 at 05:49:08:
my preference in all this is a voltage regulator (voltage source) with a current limiter, not merely a simple current regulator. I believe tubes are spec'd and designed for a specific filament voltage, and that the filament current listed for most is only an approximation provided for use in determining supply requirements. Regulating the tube to that current is unlikely to be what the manufacturer intended.I used to think that, I even wrote an article in AudioEXpress on the topic.
After adding series chokes to my battery supplied filaments I'm thinking the current reg has benefits above and beyond lighting the things correctly. It looks as though extra impedance in the supply line is beneficial - whether it blocks hash getting in or out I can't say, but it seems to do something.
BTW you can get around the issue with current v voltage by making the current reg adjustable and setting it so that the voltage drop across the filament is correct.
Mark Kelly
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Follow Ups
- I used to think that - Mark Kelly 14:35:27 05/01/07 (5)
- Re: I used to think that - dave slagle 17:47:52 05/01/07 (4)
- By "suck it and see" - Mark Kelly 19:13:56 05/01/07 (3)
- Re: By "suck it and see" - Triode_Kingdom 20:42:05 05/01/07 (2)
- I moved away from SS devices - Mark Kelly 21:18:27 05/01/07 (1)
- Re: I moved away from SS devices - arend-jan 04:43:02 05/04/07 (0)
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