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Topic: A different Fender, different pop |
Lane Gray
From:
Topeka, KS
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Posted 4 Sep 2013 4:49 pm |
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65 RI Twin, pops like a Peavey everytime I take it out of standby. It has done it the entire time I have had it. Is this something I need to worry about? I do not recall seeing it from other tube amps.
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2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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Tim Marcus
From:
San Francisco, CA
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Posted 4 Sep 2013 9:01 pm
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Can be anything from a dirty switch contact to poor lead dress
Tough one to track down without getting hands on the amp
A diode across the standby switch makes for a silent switch but makes the reverb hum. Great mod for a non reverb amp - but in your case you need to futz with snubber caps and wire dress to get it quiet.
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Milkmansound.com |
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Ken Fox
From:
Nashville GA USA
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Posted 5 Sep 2013 5:18 am
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"A diode across the standby switch makes for a silent switch but makes the reverb hum."
A reversed biased diode (anode to ground) from the amp side of the standby switch to chassis ground could act as a snubber. The max PIV voltage of the diode would need to be greater than the B+ operating voltage of the amp's power supply. Something like a 1N4009. We used to use these in Fire Alarm Systems to suppress the kick back voltage from DC relay coils and DC magnetic door holders. These coils on a 24 VDC system could generate hundreds of volts of EMF when the coil voltage was removed.
Might help there, never tried it in this application. |
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Tim Marcus
From:
San Francisco, CA
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Posted 9 Sep 2013 8:39 am
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this is what I tried - perfect for an amp with no reverb 
for your reissue, you might have to just live with it. You can try tacking a .05 1KV cap across the switch to snub
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Milkmansound.com |
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Ken Fox
From:
Nashville GA USA
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Posted 9 Sep 2013 8:42 am
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| Perfect, Tim! that is exactly what we did on relay coils. Putting it on the choke is a great idea for cathing the spike pruduced by the choke when the magnetic field around the choke collapses. |
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