switch-on, switch-off sequence for preamp/amp

cbutterworth · 2nd March 2007, 05:34 AM

I am now trying to design some idiot-proofing into my Aikido tube preamp / solid-state power amp system. So far, so good. I have been remembering to switch the power amp on last, and to switch it off first. However, at some point, I am likely to forget to follow this seqence.

Does the order of switch-on-off actually matter? My guess is that switch-off is less important than switch-on.

How difficult would it be to build a sequential power distribution circuit. It would need to have around 60 secs delay on make for the solid-state amp, and maybe 10 seconds delay on break for the preamp.

The Adcom ACE 515 does has a 10 second delay for the power-amp. I don't know if this can be changed by swapping out a relay.

Any ideas?

Charlie

Tom Bavis · 2nd March 2007, 01:41 PM

Preamp on first, off last. If you add a output muting relay, you can forget about that... it needs to mute (short) output until it's warmed up, and likewise mute on power-down..

2nd March 2007, 05:34 AM	#1
cbutterworth diyAudio Member Join Date: Oct 2006	switch-on, switch-off sequence for preamp/amp I am now trying to design some idiot-proofing into my Aikido tube preamp / solid-state power amp system. So far, so good. I have been remembering to switch the power amp on last, and to switch it off first. However, at some point, I am likely to forget to follow this seqence. Does the order of switch-on-off actually matter? My guess is that switch-off is less important than switch-on. How difficult would it be to build a sequential power distribution circuit. It would need to have around 60 secs delay on make for the solid-state amp, and maybe 10 seconds delay on break for the preamp. The Adcom ACE 515 does has a 10 second delay for the power-amp. I don't know if this can be changed by swapping out a relay. Any ideas? Charlie

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2nd March 2007, 01:41 PM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Preamp on first, off last. If you add a output muting relay, you can forget about that... it needs to mute (short) output until it's warmed up, and likewise mute on power-down..

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