From: Garey Barrell 
Subject: Re: [drakelist] Advice sought in troubleshooting L7


Garey Barrell  made an utterence to the drakelist gang
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John -

First thing I'd do is verify that the plate voltage is really dropping, 
not just the metering circuit.  I think it's highly unlikely that  THAT  
much voltage is "disappearing," in other than the metering circuit, 
without something smoking!

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
http://hr99.home.mindspring.com/R-4C_Servicez/>



john wrote:

>"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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