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Princeton reverb ?microphonic sound
Posted: Mon Mar 09, 2015 7:08 pm
by StrummersOfThunder
Getting an annoying sound from my amp.
Runs quiet but if I play anything above a whisper I'm hearing a brittle hissing sound with the notes. Like someone shaking round the broken filament in s light bulb.
Microphonic tube! If so which one? How to tell?
Any other causes of that sound?
Re: Princeton reverb ?microphonic sound
Posted: Mon Mar 09, 2015 7:21 pm
by StrummersOfThunder
Re: Princeton reverb ?microphonic sound
Posted: Mon Mar 09, 2015 7:37 pm
by Jay
I quite like that sound.
..... but the reverb hum at the end was horrible!
Re: Princeton reverb ?microphonic sound
Posted: Mon Mar 09, 2015 7:43 pm
by GrantB
Tap each tube gently and see/listen for which one makes the most noise
Re: Princeton reverb ?microphonic sound
Posted: Mon Mar 09, 2015 7:43 pm
by GrantB
Might not be microphones though...just rattling like heck
Re: Princeton reverb ?microphonic sound
Posted: Mon Mar 09, 2015 7:45 pm
by Slowy
jvpp wrote:I quite like that sound.
..... but the reverb hum at the end was horrible!
Was thinking the same thing; great tone!
Strummers, lightly tap each tube with a pencil while the amp's running. Should point you in the right direction.
Re: Princeton reverb ?microphonic sound
Posted: Mon Mar 09, 2015 8:08 pm
by StrummersOfThunder
Yep. Got it. Power tube 2.
Thanks!
Guess I need a new one.
Re: Princeton reverb ?microphonic sound
Posted: Mon Mar 09, 2015 8:22 pm
by GrantB
Or two....
Re: Princeton reverb ?microphonic sound
Posted: Mon Mar 09, 2015 8:35 pm
by StrummersOfThunder
Indeed