Amp Crackle When Turned On



Hello everyone! I have a simple question that I thought I would ask here before I bother the nice guys at Bogner. Anyways I have an Ecstacy 101b and whenever I turn it on I hear a dirty crackle for a about 5 seconds, then it goes away, and the amp plays fine. The amp is fairly new about 6 months, and it did not do it at first but I hadn't played it for about 4 months. Is this somewhat normal - does the amp just need to be played again for a little bit and it will go away. Or do ya'll think I need to call the Bogner team. Any advice is greatly appreciated, thank you all so much.



I can't imagine the filter caps going at only 6 months, but you never know! I'd guess a preamp tube might be microphonic.

Definitely call Bogner and ask Sean what is up.

I usually test for a microphonic tube with the old "pencil test"; tap each pre tube very lightly with a pencil, with the amp on and nothing plugged in (keep the cab plugged in, of course).

If a tube is microphonic when you tap it, you often hear the tapping amplified (hence the term, microphonic). Replace that tube.

Note that the tube in the first position will sometimes sound a little bit noisier than others when you tap it, but when you find a microphonic tube, you hear a big difference.

Jon Silberman

10Q Jerry & Dickey
Silver Supporting Member
But Les, is a microphonic tube consistent with just 5 seconds of crackling, only right after you hit the standby switch and send it the voltage?

Unquiet, where are you when we need you?! ;)


Thanks for the reply's everyone, and thanks for the link. Hopefully this unquiet fella will see this and post his reply. I gather he's pretty knowledgable? Anyway I guess if all else fails I'll give Sean a call. I think that's who I spoke with before when I was deciding on the amp - nice guy.



Gold Supporting Member
You might try, with the amp off, flicking the standby switch a number of times. You might have a dirty contact in the switch.


I also have the same Issue with my Atma. Makes the same crackle when first turned on. Then goes away. Amps sounds great. Does not affect the sound nor the output. Did you ever find out what it was? Made this crackle since it was new.

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