John,
Sounds to me like a power supply problem. A leaky capacitor, bad rectifier,
etc. If it's set for a really long tome, suspect the caps.
Will
*********** REPLY SEPARATOR ***********
On 3/6/05 at 2:24 PM john wrote:
>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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