V76 gives pfwiieeeeeeeet sound at startup :)

[andre tchmil]

Hi, one of my V76 preamps gives a Pfwiieeeeeeeet sound for about a second, 30 sec after startup :green:
after that the preamp performs just as excellent as my other one ( so comparison is easy ) for the rest of the day.
what component could causes that ??

 

[tony dB]

i would suspect a dodgy capacitor or bad solderjoint, most likely caps.

Your V76 will never get over this, send it to me, you've got my address :grin:

does it changes when you manually touch the components? uim, i mean low voltages here!
good luck hunting the problem,

Tony

 

[toby]

does kinda sound like a dodgy cap charging up if its a constant time the the noise occurs. doesn't v76 have built in psu? check the big caps in the psu.

 

[andre tchmil]

I replaced all the caps recently with high spec. ones.
Maybe I overlooked something, will look at it again.

Tony, thanks for the kind words,
If I ever cosider to let them go .........

 

[tony dB]

who doesn't try never wins André

 

[Svart]

does it do it with or without a mic attached? some of my pres do this with certain mics hooked up as the phantom charges.

 

[clintrubber]

does it do it with or without a mic attached? some of my pres do this with certain mics hooked up as the phantom charges.

This rings a bell - even with the specific channels muted I hear that sound when turning phantom off. The channels I'm talking about are not exactly V76-like, but anyway, yes, so, perhaps - something phantom related are your side ?

 

[andre tchmil]

It does with or without a microphone connected.
It sounds like an old Star Wars shooter. from 1khz down to around 80hz for about 4 secs.
Good to start the day with cleaned ears , I must say
:green: