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Old 16th September 2012, 10:14 PM   #11
VaNarn is offline VaNarn  Australia
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Since the voltage and current ratings for the relay contacts are unknown,the obvious place for the delay switching is between the H.T.winding centre-tap and the connection to ground.
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Old 16th September 2012, 11:58 PM   #12
roline is offline roline  United States
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When I use damper diodes for delayed B+, I use the standard C-L-C filter for the supply hash and then add the diode and cap. This last cap becomes the Max B+ that I use to bias the output transformers. Then R-C for second stade and R-C for first stage like normal.
For the C-L-C filter be sure to use enough of a safety margine for the cap's voltage rating, stack them if you need to.
I've used this method on power amps and pre/headphone amps to prevent turn on noise, and turn on overvoltage.
SO many tubes, SO little time!!!

Last edited by roline; 17th September 2012 at 12:00 AM.
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Old 17th September 2012, 04:16 AM   #13
2wo is offline 2wo  United States
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If you replace the 5U4 with a indirectly heated rectifier, you won't need the delay circuit at all...John
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