Unsolder one of the HV AC leads to the PC board and try it.
Keep isolating things one step at a time and with the tubes removed.
Carl
KM1H
----- Original Message -----
From: "Tom Osborne" <w7why@frontier.com>
To: "Amps" <amps@contesting.com>
Sent: Saturday, January 18, 2014 5:44 PM
Subject: [Amps] 811H pops fuses
HI All
I have an AL-811H that I've had for about a month. It has been working OK
until last night.
I was making a contact and all of a sudden, it started chattering and blew
a
fuse. This morning I took the cover off and pulled the tubes. I turned
it
on and it started chattering again and blew another fuse. It blows the
one
closest to the side of the amp (left side fuse if looking at it from the
back).
I checked the meter diode and it's OK. Checked all 4 tubes and the grids
are grounded directly to ground.
I checked the diodes in the HV string and they seem OK.
Any suggestions where to go next? Thanks and 73
Yom W7WHY
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