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March 22, 2023, 10:05:49 PM

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Failed install of snubber circuit to kill popping during shutoff Marshall 5010

Started by aaron, November 11, 2022, 06:09:20 AM

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Hi everyone, I went to this page Same problem as mine w/ a solution, and installed this.

All it did was act as a bypass to the on/off switch, now it's always on. >:(

So, does anyone have a solution to popping noise when shutting down a SS amp?

Here's the schematic:


Does your amp switch both sides of the line like the schematic you linked ? If so, did you install the network on both sides ?

Is your cap(s) X2 rated ?


It's not possible for that mod to make your amp 'always on', so somehow you have made a mistake.
Pictures of how you did it will help.


I have another idea to suppress the pop, using an H3Y-2 10S time relay and a high-power resistor, preferrably an 25-watt 16-ohm one. The relay's supply voltage should be the same as your local mains voltage.
Wire pin 13 of the relay to the neutral, and pin 14 to the live wire controlled by the power switch. Cut both wires leading to the speaker, connect the pair coming from amp circuitry to pin 9 and pin 12, and connect the pair coming from speaker to pin 5 and pin 8. Finally, connect the resistor between pin 1 and pin 4, and adjust the time knob between 5 and 10 seconds.
The relay won't activate in the first several seconds after powering up and will deactivate immediately when a power loss occur, whether it's caused by turning off the switch or pulling out the plug directly from the receptacle. Thus, the speaker is always disconnected from the amplification circuitry when the "pop" current occurs, and simultaneously the power resistor cuts in as a dummy load to prevent any damage to amplifier due to running without load.
Hope it will work!