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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: Low cathode resistor bias posted by Doug Flynn on July 16, 2005 at 21:47:01:
I've just built a px25 amp using that method with one resistor shared between four valves VA and driver across both channels, passing their filamnet and cathode current, resulting in a bias resistor of 8 ohms. Because the main influence on the voltage pulled across the resistor is the filament current this is vertual fixed bias.My method employs a very old technique of using the same valve at two stages operating at the same quiescent point so a shared resistor can be used, the tchnique of using shared cathode resistor across channels, and finally the technique of passing a greater current through the cathode resistor to reduce it's value.
Only one Caddock or Mills non inductive to buy.
Hooking it up today, I'll let you know if it sounds any good.
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Follow Ups
- Re: Low cathode resistor bias - Paul Barker 07/16/0523:30:27 07/16/05 (9)
- Hot stuff! - Brian C. 10:50:02 07/17/05 (7)
- Re: Hot stuff! - Paul Barker 11:13:59 07/17/05 (6)
- Re: Hot stuff! - Brian C. 13:45:21 07/17/05 (5)
- Re: Hot stuff! - Paul Barker 23:29:37 07/17/05 (4)
- Yes, I remember... - Brian C. 03:04:16 07/18/05 (3)
- Re: Yes, I remember... - Paul Barker 04:14:37 07/18/05 (2)
- Re: Yes, I remember... - dave slagle 18:36:50 07/18/05 (1)
- Re: Yes, I remember... - Paul Barker 22:53:26 07/18/05 (0)
- Re: Low cathode resistor bias - Paul Barker 07:38:58 07/17/05 (0)
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