Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: BobbyS on February 12, 2013, 01:11:08 am

Title: Brown Princeton Trem making thumping sound
Post by: BobbyS on February 12, 2013, 01:11:08 am

Hello,


I am new here posting, but have gotten great info from lurking. I am having an issue with a Brown Princeton 6G2 that I built up. The amp is working great, except when I increase the trem intensity I get a thumping sound that is the same as the speed of the trem. If anyone can help I would greatly appreciate it.

Thanks
BobbyS

Title: Re: Brown Princeton Trem making thumping sound
Post by: sluckey on February 12, 2013, 06:42:52 am

A diode across the Intensity pot will probably help.

(http://www.el34world.com/Forum/index.php?action=dlattach;topic=15087.0;attach=35232;image)

Title: Re: Brown Princeton Trem making thumping sound
Post by: Tom_Hull on February 12, 2013, 08:16:03 am

hi bobbyS

first post ,welcome.

my amp developed that thumping on the intensity pot at high volumes.

it did not have it before.working on that thumping  as well .

can the power grid resistors showing on the schematic be the problem .??
i do believe there are not matched ,.????same value but did not read the same before installing them ..


tom

Title: Re: Brown Princeton Trem making thumping sound
Post by: Ed_Chambley on February 12, 2013, 08:54:42 am

Welcome Bobby.  Great place with some very knowledgable folks.

Title: Re: Brown Princeton Trem making thumping sound
Post by: BobbyS on February 13, 2013, 01:06:23 am

Thanks everyone.

I will give the diode a try sluckey.