Myryad MA240 power amp pops when shutting down.

[perrin21]

hi, I have 4x myryad MA240 Amplifiers (running bridged as monoblocs) and one has started to pop when the relay shuts off as its powered down. the other 3 amps don't and this is a new issue for the one that does. Any ideas what is causing it? could it be the relay is worn and needs replacing? or could it be something else? otherwise it works fine.

 

[sgrossklass]

I'd say unbridge the amp and check each output with a voltmeter, watching out for excessive DC (>50 mV or so)
a) during operation
b) during shutdown.

That will tell you whether it's either a general DC offset issue or possibly an issue with a leaky muting transistor. Proceed from there.

 

[perrin21]

I'd say unbridge the amp and check each output with a voltmeter, watching out for excessive DC (>50 mV or so)
a) during operation
b) during shutdown.

That will tell you whether it's either a general DC offset issue or possibly an issue with a leaky muting transistor. Proceed from there.

already tried that. there was no excessive DC on the outputs.

 

[sgrossklass]

But did you find a transient corresponding to the pop then? (An oldschool analog voltmeter may actually be better for this.) If so, where? There has to be something, likely at least a few hundred mV in magnitude.

 

[eeraudio]

Ghae anyone try to diy kv2 amp?

 

[perrin21]

But did you find a transient corresponding to the pop then? (An oldschool analog voltmeter may actually be better for this.) If so, where? There has to be something, likely at least a few hundred mV in magnitude.

what could be the cause? is it possibly the relay needs replacing? they are £4 so it's worth a try. anything else to check?