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b+ Delay Arrangement for Power Amp
b+ Delay Arrangement for Power Amp
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Old 29th June 2012, 11:12 PM   #11
Chris Hornbeck is offline Chris Hornbeck  United States
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Originally Posted by commstech View Post
20 seconds later, the AC input to the primary of the HV transformer will be turned on by means of a delay relay and thus giving the HV.
Will there be any potential problems with this kind of arrangement? Eg. any noise or pops when the maximum HV dc hits the tubes?
The delay relay needs to be a snap action, and not an Amperite bi-metal switch type. The latter has too much arcing in its final second at practical load currents, but could run a separate higher rated snap relay.

You may want to consider including a hysteresis to enforce the same startup routine in case of a short power interruption, if not already included.

All good fortune,
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Old 30th June 2012, 12:12 AM   #12
PlasticIsGood is offline PlasticIsGood  United Kingdom
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Originally Posted by garbage View Post
i did not manage to solve the problem. the pop occurs at the speaker with the mono that is already turned on. i think it is because the b+ in rush on the 2nd mono caused some spike in the electrical outlet. both monos are connected to the same electrical circuit.

the circuit to my audio room is a dedicated ring that comes from my main circuit breaker.

i guess the only way to really solve this is to build a soft start circuit like the one at ESP, or implement some muting at the output transformer secondary (but i was told that output transformers should ideally not be unloaded for too long).
Does it still pop if the input to the amp is shorted, assuming there is a series cap before the first grid? You would need a relatively big disturbance on the mains supply to make a pop, but only a small one on ground or signal input. Whatever, it could be worth finding out where it's coming from, and how it's getting in. Muting will be logically tricky, surely? How will one amp know when the other has finished switching on? i.e where will the un-mute signal come from?

Maybe series resistors before the first PS caps would make a difference by slowing down the inrush. Worth an experiment if you have low value, high power resistors handy. If they work they will help preserve the caps too.

Perhaps you could switch both amps on with a single timing ciruit?
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