switch po

[danotron]

Whenever I'm playing my express and someone turns on or off an apliance I get a pop Any ideas why this might be? and how to fix it?

[UR12]

Whenever I'm playing my express and someone turns on or off an apliance I get a pop Any ideas why this might be? and how to fix it?

Where did you get your express? Did you build it. It sounds to me like there is no varistor installed across the power switch. You are picking up noise spikes on your power line. Or maybe you have a bad ground on your power receptical on the wall.

[Dr-Joned]

Could be a grounding issue, such as an inferior house ground. A simple solution would be to use a Corcom EMI/RF filter. They are made in many different forms and shapes. They even make one that will replace the standard IEC connector on the back of the amp. MAKE SURE you have enough clearance before installing one. I have used many of them on professional sound systems where we had issues with air handlers and such.

[danotron]

I made the express and I didn't install the varistor....I gues putting it in will solve the problem

I also just found out that the cordless phone induces noise. Would putting a resistor on the first stage grid fix that?

[UR12]

I made the express and I didn't install the varistor....I gues putting it in will solve the problem

I also just found out that the cordless phone induces noise. Would putting a resistor on the first stage grid fix that?

Congrats on the build! It depends if you have a grounding issue on the outlet but the varistor should help. It will also protect your amp from these spikes doing an damage to your amp.

As far as the phone goes, did you install a bottom plate to cover the bottom of the chassis?