Troubleshoot And Repair This ADCOM GFP-1A Stereo Preamp - Part 2 

Thanks! yes I fixed some of the jumper wires too, looked rather sloppy and some were almost shorting together.

Glad to know you enjoyed the video, I appreciate the nice comments, thanks for watching!

Thanks for watching and I am glad you like the details I cover. No relation to the tech or location you mention.

Thanks for subscribing and watching! Glad to know you enjoyed the video. Hope you have a nice Christmas season. I have had a lifelong interest in electronics, it's part of my work starting with my first job and studied in college with a degree. I've always enjoyed talking and sharing electronics knowledge and I thought the videos would be a chance to try teaching in a different format and perhaps help others with similar interests especially in troubleshooting and repairs. I have seen some of the fantastic work that Paul Carlson does and drool over the endless cool equipment he has. However I do not know him personally.

@@EriksElectronicsWorkbench Thanks for replying Erik, Many RU-vidrs don't bother.

My videos and repairs are just a hobby, not an Adcom repair center. I'm glad you enjoyed the videos! Capacitors in general age from both use and time. Some types like very old wax paper and foil age terribly with time as the paper becomes acidic and the capacitor becomes more like a resistor. Electrolytic capacitors can dry out or leak as they age. Electrolytics that remain in use can have a better life span but if that use involves high temperatures, high ripple currents, then it is counter productive and the life may be in the low 1000's of hours. Switching power supplies are very hard on electrolytic types. You may hear the term "reforming" the capacitors in very old equipment by bringing up the operating voltage slowly. This can help but often replacement is the best choice.

Jochen, thanks for watching. I found the potentiometer on eBay. However I do not think the seller has them now... www.ebay.com/sch/i.html?_ssn=rivervalleylandscapingservice2012&store_name=vermontelectronicsplus&_oac=1&_trksid=p4429486.m3561.l170197 however you might also consider this part ... www.ebay.com/itm/155141896870

@@EriksElectronicsWorkbench Thanks, Erik! I was able to fix it. Also major issue were the 1000µF and 470µF caps. leaking and short circuited inside :-)

I agree the component placement was sloppy. I have worked on several other Adcom devices and they did not have this build issue. Not sure what happened in this case.

Hi, please contact by email to discuss. If you go to the channel home page and click on the text below the channel title it will bring up an "about this channel" and a link for email.