Nasty pop when I power down

[Captn Dave]

I have an old HK 6v6 pp receiver that has a nasty pop when I power it down. I put a .01uf cermaic cap across the power switch and that seemd to take care of it.

My question: I see in schematics that the cap is variously placed either 1) across the switch, or 2) across the AC line in or 3) across the PT primaries. What is the proper or best way to apply the cap?

Thanks

 

[kevinkr]

I have an old HK 6v6 pp receiver that has a nasty pop when I power it down. I put a .01uf cermaic cap across the power switch and that seemd to take care of it.

My question: I see in schematics that the cap is variously placed either 1) across the switch, or 2) across the AC line in or 3) across the PT primaries. What is the proper or best way to apply the cap?

Thanks

Depends on exactly what you are trying to accomplish, in this case since the switch probably arcs as the power is removed placing a capacitor across the switch is probably the best place. Placing one across the primary will generally also help with the emf as the transformer's magnetic field collapses which may prevent the arc from occurring.