Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: jjasilli on March 30, 2011, 09:41:52 am

Title: Univox U-42 on the Bench - Trem repair
Post by: jjasilli on March 30, 2011, 09:41:52 am

Some photo's.  In the trem circuit:  the resistor off the speed pot wiper had surged in value; the 3X .02 caps were replaced

http://www.facebook.com/album.php?aid=107302&id=1129726131&l=293db6a9e6

EDIT:  Whoops I originally posted this on the wrong board; so I dleted that & moved the topic here.  There was 1 repsonse by Loosechange, wwhich I'll post below as a reply

Title: Re: Univox U-42 on the Bench - Trem repair
Post by: jjasilli on March 30, 2011, 09:43:41 am

This post was by Loosechange; but I moved this thread, so here's his post in reply:

Loosechange:  Just worked on a U45B. I changed every cap... It really easy with access to the back of the board. Works really great now.

Title: Re: Univox U-42 on the Bench - Trem repair
Post by: jjasilli on March 30, 2011, 09:49:06 am

Yes, BUT:  I found it to be a pain to trace the circuit, even for that small a board.  Give me a Hoffman layout anyday!  Also, the amp is pretty noisy.  One reason may be:  The "chassis" is merely an open frame.  It is easy to access the bottom of the circuit board; but there's no shielding to quiet ambient noise.