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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: if I measure the voltage drop across the cathode bias... posted by Jim McShane on July 29, 2014 at 14:18:49:
thanks, Jim, I took another look under the hood, there is a large 33 ohm resistor connected from pin 6 to joint pins 1 & 8, pin 6 is grounded to the pcb which is also grounded to the ground connection on the separate bias board. The bias board has a wire connected to the joined pin 1 & 8, the bias board has a multi-turn trim pot that is used to set the bias (1.15v) I am a bit confused by this arrangement, rather than a large bias pot, like the Cit II has, there is this little trimpot, probably a 1/2 watt max, to set the bias with, and it appears to be in parallel with the large 33 ohm cathode resistor on joined pin 1 & 8, any idea?
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Follow Ups
- RE: if I measure the voltage drop across the cathode bias... - gkargreen 18:09:06 07/29/14 (7)
- RE: if I measure the voltage drop across the cathode bias... - Jim McShane 09:17:37 07/30/14 (5)
- RE: if I measure the voltage drop across the cathode bias... - gkargreen 10:11:32 07/30/14 (4)
- RE: Measure your voltage on pin 5 - Russ57 08:38:55 07/31/14 (3)
- RE: Measure your voltage on pin 5 - gkargreen 08:50:17 07/31/14 (2)
- RE: -33?????? - Russ57 14:46:28 08/01/14 (1)
- RE: -33?????? - gkargreen 14:55:29 08/01/14 (0)
- RE: bias is set rather differently - Russ57 20:58:30 07/29/14 (0)
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