POP when switching on / off

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petetexas
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POP when switching on / off

Post by petetexas » Sat Feb 10, 2024 3:20 am

Hi All ,

Been a while since coming on here , but now have a problem with my T Max Twin Channel Bass Head ( old school Solid State ) this is the place !

When switching on/off , I get a loud POP through the speaker .

Have change the mains switch for a brand new , correct spec switch , no difference .

Any suggestions ?

Pete

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j0nsnell
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Re: POP when switching on / off

Post by j0nsnell » Sat Feb 10, 2024 12:37 pm

Fit a 100nF Class X capacitor across each switched contact and a 100nF Class Y from the output of the switch to neutral. That will block mains borne interference.
Class X goes between J7 & J8. Class Y between J8 & J14

petetexas
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Re: POP when switching on / off

Post by petetexas » Sat Feb 10, 2024 3:44 pm

Thank you very much kind sir

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dak
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Re: POP when switching on / off

Post by dak » Sat Feb 10, 2024 5:42 pm

That's more against switchoff bangs than pops and doesn't help with switch-on noises (unless we are talking about switching on immediately after switching off). Would need to look at the circuit diagram to see whether there is a good remedy.

LarmanKhemka
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Re: POP when switching on / off

Post by LarmanKhemka » Mon Feb 12, 2024 11:17 pm

Hi! A loud pop when switching your amp on/off can be concerning but isn't necessarily catastrophic. Here are some possible causes and suggestions:

Capacitor discharge: Old amps often have capacitors that discharge when powered off, causing a pop. This might not be harmful, but if it bothers you, consider having a tech check the capacitors for wear.
Grounding issue: Faulty grounding can cause pops. Check all cable connections for tightness and proper orientation.
Internal component issue: Less likely, but possible. If the above solutions don't work, consult a qualified amp technician for diagnosis and repair.
Remember, tinkering with electronics can be dangerous. If you're unsure, seek professional help.

petetexas
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Joined: Mon Jan 05, 2015 8:29 am

Re: POP when switching on / off

Post by petetexas » Fri Feb 16, 2024 11:57 am

Hi ,
Have put a contact suppressor across the mains switch ( 0.1mF 100R ) sometimes there is still a pop , but quieter when switching on , but when switching off all you hear is the click of the switch .
Pete

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