Hello, I remember why I like tubes now.. :>)
My tr7 failed one night when I turned it on. It had been performing fine with no apparent problems. I noticed that output power was down (all other functions are ok), then as I continued troubleshooting (checking feedlines etc), it went into oscillation even when unkeyed. We have been tinkering with it, and it appears to start oscillating when we key it (and unkey)after replacing the drivers with a set similar to what was in it. Question: Are these supposed to be a matched set (mrf475)? And, will the pin diodes everyone refers to in the high pass filter cause oscillation? The set (predrivers) that was in it, was not a matched set (not mrf475 or drake stock), and they were not high quality (someone had replaced them before, and done it poorly). The rig did work for quite a while (2 years).. so maybe a matching pair wasn't critical. Looking for thoughts. My service manual doesn't do step by step troubleshooting.. thanks, Craig kc5pgz ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ----------------------------------------------------------------------
