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Author Topic: Speaker Pop When Switching to or from Standby on a Peavey Classic 50  (Read 5649 times)

awdman

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I am working on a Peavey Classic 50 and need to know if it is normal for a tube amp to have a speaker POP when coming in or going out of standby with the volume up to about 4? Is there a capacitor I could add to eliminate this?


Thanks,
Anthony

J M Fahey

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Re: Speaker Pop When Switching to or from Standby on a Peavey Classic 50
« Reply #1 on: October 24, 2009, 07:18:46 PM »
Does it pop when volume/tone/master/reverb are off (*all* pots in "0")?

awdman

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Re: Speaker Pop When Switching to or from Standby on a Peavey Classic 50
« Reply #2 on: October 24, 2009, 08:13:33 PM »
No if I turn the volume down it does not pop, it does not matter where the reverb is and will do it on clean, or dirty channel. The Classic 50 has a Bypass where you could enter your own effects which bypass all tone controls and  volume. there it does not pop when I do this. Also with everything set at zero except the main volume it still pops.
I could possibly do a sould byte of this.

Anthony
« Last Edit: October 24, 2009, 08:23:34 PM by awdman »

J M Fahey

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Re: Speaker Pop When Switching to or from Standby on a Peavey Classic 50
« Reply #3 on: October 24, 2009, 09:50:10 PM »
Then you don't have a problem, it's normal.
Non-standby tube amps don't pop because they have a "slow turn-on" built-in, the heater delay of about 30 seconds, but you are pre-heating it and turning it on "suddenly", which is all right.
Most SS amps pop or thump, because they are instant-on, so new chipamps often have some delay built in.
In a nutshell: don't worry, just turn your amp on and off with volume down.

Steve Dalllman

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Re: Speaker Pop When Switching to or from Standby on a Peavey Classic 50
« Reply #4 on: December 12, 2010, 12:32:23 PM »
In Fender amps, when the switch gets dirty, the pop gets loud. Cleaning does not help.

The fix in a Fender (and I'm assuming the PV is similar) is to replace the switch, and then solder a cap across the switch. .01uf is fine, at least 630v (1k or 2kv even better).

Enzo

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Re: Speaker Pop When Switching to or from Standby on a Peavey Classic 50
« Reply #5 on: December 13, 2010, 10:48:04 PM »
A cap might help, might not.  As Juan said, it really is not a problem.  Many many amps pop, and it hurts nothing.  It is not a sign of impending amp failure.

The momentary spike when the switch opens is being picked up by the preamp, and amplified by the circuit as the powr fades away

 

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