UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Radio (domestic)

Notices

Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only.

Reply
 
Thread Tools
Old 9th Oct 2019, 11:57 am   #1
cathoderay57
Heptode
 
Join Date: Oct 2017
Location: Bristol, UK.
Posts: 631
Default Graetz Sinfonia 3262 Odd Fault

Hello folks, my Graetz Sinfonia developed a fault on FM. After about 5-10 minutes the sound reduced dramatically (the received station was still just about audible), a background hum appeared and deflection on the EM34 magic eye went to zero. After some prodding I discovered that by tapping the EABC80 normal reception was restored. I checked the valve base connections, cleaned pins and valve socket receptacles, checked the skeleton preset pot on one of the diode anodes but the fault returned. Putting the valve on the VCM 163 mostly shows serviceable but on one occasion I was able to reproduce the fault which was that a'd and a'''d went open circuit then started conducting again when the valve was tapped. Not seen this before. A replacement EABC80 was fitted and the radio has (so far) behaved itself. Cheers, Jerry
cathoderay57 is offline   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 5:27 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright ©2002 - 2019, Paul Stenning.