Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Colas LeGrippa on April 26, 2015, 10:45:23 am

Title: BASSMAN brownface standby loud pop
Post by: Colas LeGrippa on April 26, 2015, 10:45:23 am

Buenos días !

I have recently overhauled a Fender bassman amplifier with new caps all the way. I can't get rid of the standby switch pop,. I've tried putting a .068 / 600V accross the s/b switch, or either sides to gnd, without results.
Would grid stoppers on the power tubes cure the problem ?

Thanks

Colas

Title: Re: BASSMAN brownface standby loud pop
Post by: punkykatt on April 26, 2015, 11:43:54 am

Did you try another switch?

Title: Re: BASSMAN brownface standby loud pop
Post by: Colas LeGrippa on April 26, 2015, 04:05:03 pm

no...!!!!!!!!!! but I will , immediately. 

Colas

Title: Re: BASSMAN brownface standby loud pop
Post by: Colas LeGrippa on April 26, 2015, 04:22:10 pm

even louder with other new switch, but it was a good thing to try !

Colas

Title: Re: BASSMAN brownface standby loud pop
Post by: TIMBO on April 27, 2015, 01:12:24 am

Hi Colas, I have used 150k/3w resistor across the switch, this allows a little voltage to the filter caps and reduces the inrush that causes the pop.

Title: Re: BASSMAN brownface standby loud pop
Post by: Willabe on April 27, 2015, 01:17:43 am

Dumb question, with the amps volume on 0?


                 Brad     :dontknow:

Title: Re: BASSMAN brownface standby loud pop
Post by: kagliostro on April 27, 2015, 01:29:40 am

Ciao Colas

dai un'occhiata qui e vedi se può essere interessante

http://el34world.com/Forum/index.php?topic=14021.msg131848#msg131848 (http://el34world.com/Forum/index.php?topic=14021.msg131848#msg131848)


(http://www.diyitalia.eu/forum/images/smilies/419496_32.gif)


Franco

Title: Re: BASSMAN brownface standby loud pop
Post by: Colas LeGrippa on April 27, 2015, 10:04:30 am

Ciao kagliostro, grazie mille, sei com'un fratello per me !