diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Pass Labs (http://www.diyaudio.com/forums/pass-labs/)
-   -   Broken CAS2 Amp (http://www.diyaudio.com/forums/pass-labs/229479-broken-cas2-amp.html)

Dale-thehtguy 6th February 2013 06:22 PM

Broken CAS2 Amp
 
Hello all,

I collect old solid-state amplifiers and recently rented will problem with my CAS 2. I have only owned it for two months, and it worked great until today. While demonstrating it for friend of mine, I suddenly smelled the odor of burning carbon resistors. This was preceded by a little bit of distortion which I presumed was in the 50-year-old recording I was listening to.

Upon opening up the cover, I found that one channel had about six burnt carbon resistors on the board. To actually got hot enough to melt the solder a drop off the pad. As this had become one of my favorite amps very quickly, I would really like to fix it.

I am looking for any suggestions on what to look at, and perhaps a better schematic that has been loaded on this form previously.

Any help or suggestions would greatly appreciated.


Thanks,
Dale

JamesBrennan4 19th February 2013 02:34 AM

CAS2 differs from CAS1 by having more output transistors. Input and VAS are pretty much the same. There are not six resistors that could all burn at the same time. Can you identify exactly which resistors, by resistance (color codes if readable) and wattage and by location on pcb. How about a picture showing which resistors.

I have two CAS1 and a CAS2, all of which I have repaired in the last few years.


All times are GMT. The time now is 07:01 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2