[Amps] Ameritron Al-1500 excessived grid current & shut down

MU 4CX250B 4cx250b at miamioh.edu
Mon Aug 27 09:17:20 EDT 2018

Herb, that's usually a sign of no plate voltage on the tube.
Jim w8zr

Sent from my iPhone

> On Aug 26, 2018, at 2:30 PM, Herbert Schoenbohm <herbert.schoenbohm at gmail.com> wrote:
> Today I turned on the Al-1500and immediately notice that the grid current
> went all the way over to the right and the amp grid protection circuit kick
> in.  Even with only 5 watts of drive, the grid current is about 175 ma.  I
> also notice that I don't see any HV indication.  I hope this is not a bad
> 8877 final tube. Any suggestion to confirm this would be appreciated.
> Thanks,
> Herb, KV4FZ
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