Howard, Hmmm. Give the loud pop and subsequent drop of output power, I'm wondering if you had a brief internal arc within one of your final tubes. A violent arc that involves the cathode could easily destroy a region of the cathode coating and thus reduce peak emission, yet allow the tube to continue to operate.
But maybe you lost one of the tubes completely? Is your resting plate current normal? Dennis AE6C On Sun, Feb 21, 2010 at 3:58 PM, Howard Traxler <[email protected]>wrote: > Hi all, don't know that this question went out on the list: > > Friday I was tuning up my T-4XC on 80M. Heard a very loud POP came from > somewhere behind the front panel. No smell of smoke or oazone. > > Never tune for more than 4 or 5 seconds at a time and never off-resonance > more than 1 or 2 seconds. Before this incident, the xmtr tuned up to 120 > to > 140 watts (according to my TW-1 talking watt meter); after, it now peaks at > > about 80W. I had a QSO afterwords, so I know it's working some. Antenna > match is about 1.3/1. > > Do you think I did something real bad or maybe it's just a tube or a plate > choke or something? Where should I start to diagnose? > > Thanks, anybody. > > 73, Howard, WA9RYF > > _______________________________________________ > Drakelist mailing list > [email protected] > http://mailman.zerobeat.net/mailman/listinfo/drakelist > >
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