Bottlehead Forum

Bottlehead Kits => BeePre => Topic started by: rockpassion on May 26, 2015, 01:52:37 PM

Title: Occassional Static sound [resolved]
Post by: rockpassion on May 26, 2015, 01:52:37 PM

Hello all,

I look at this as an opportunity to learn so bear with me.  I just bought a pair of Quicksilver V4's, they are about 5 years old with new JJ KT88 tubes plus new 12FG7 input and 12BH7 driver tubes.  I plugged them in and found them to really be great sounding amps (they replace Dynaco MKIII full Curcio Mods).  I just noticed over the last couple of days, I have only had them for 5 days, what sounds like a static discharge (scratchy, popping sound) coming from my right speaker.  I changed the output on my BeePre preamp and now the noice is coming from the left speaker.   I did not have this issue with my Dynaco's hooked up but am wondering if a connections is lose and discharging in some manner since making the change.

I have not swapped the tubes on the preamp  right to left.  Any thoughts on what to do next.  Once before I resoldered most of the connections which got rid of a bothersome buzz/hum should I do this again. 

Thanks for your thoughts before hand. 

Regards

Richard

Title: Re: Occassional Static sound
Post by: Paul Birkeland on May 27, 2015, 06:51:22 AM

I think your instincts may prove to be correct.  With everything plugged in, what is the DC resistance between the BeePre chassis plate and one of the Quicksilver chassis plates?

Title: Re: Occassional Static sound
Post by: rockpassion on May 27, 2015, 11:59:46 AM

Paul,

Maybe a stupid question but how do I use a DVM to measure this?

Thanks for the reply

Richard

Title: Re: Occassional Static sound
Post by: Paul Birkeland on May 27, 2015, 12:18:05 PM

Set it to Ohms (lowest scale), touch one probe to the metal BeePre plate, touch the other probe to the metal on the Quicksilver chassis (maybe a screw head so you don't scratch that lovely chrome)

Title: Re: Occassional Static sound
Post by: rockpassion on June 04, 2015, 08:12:52 PM

I beleive I found the problem.  I changed the EL84's and the static sound followed the change.  I took them both out cleaned the pins and placed them back.  Static is gone.  I am not sure if the cleaning did it or just reseating the tube in the socket which resulted in better contact.  Whatever it is the static is gone. 

Richard