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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: Switching from fixed to cathode bias posted by Eli Duttman on March 30, 2014 at 17:53:12:
Eli says it well. You may be able to get that taller B+ easily.
For example, if you are using a L-Critical choke input filter, you could reduce the choke's inductance to non-critical, with a L1/C1/L2/C2 and get the "taller" B+ you need.
PSUD 2 in a Triad C-56U with a 2 A. current rating, 35 mHY and 0.8 Ohms DCR as L1. Useful piece. L2 could be an EDCOR "XC" series, either 1.5 HY at 17 Ohms or 2 HY. at 21 Ohms. C1 is 20 uF WIMA DC Link flat plate film and C2 is 50 uF WIMA, same type.
Execute the Rk with closely matched and doubled-up Mills MRA series Rk resistors, and employ as short a return to ground as possible, and it will be more dynamic-sounding than using any single resistor.
Have fun.
Jeff Medwin
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Follow Ups
- RE: Switching from fixed to cathode bias - drlowmu 19:10:02 03/30/14 (1)
- RE: Switching from fixed to cathode bias - DAK 10:51:21 03/31/14 (0)
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