From: "john" 
Subject: [drakelist] Advice sought in troubleshooting L7


"john"  made an utterence to the drakelist gang
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I'm just firing up a long dormant (and nearly new ) L7 for the first 
time.  I purchased it from the original owner who said it was used 
only 6 hours before his condo neighbors complained about the TVI 
and he put it in the box, which is where it was when I bought it a few 
months ago.

I formed all the caps in the supply (most were quite good yet), and 
installed the tubes in the sockets. I had the unit in CW mode, per 
the manual, and fired it up for the first time. I can hear the fan and 
there was no smoke, but the plate voltage sits at only 1500V and 
begins to drop after about 5 seconds.  I've turned it OFF again, after 
no longer than about 10 seconds, as the reading (no load, not in 
transmit) seems way low. There does not appear to be any plate 
current flowing during this time.

How to proceed in trouble shooting?

Restart, without tubes in sockets?

I'm afraid to leave it on longer, for fear it'll toast something.
There's no unusual smells, noises, etc.

All hints appreciated.
John K5MO 


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