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

David Robbins k1ttt at verizon.net
Mon Aug 27 09:37:15 EDT 2018

Look for a blown fuse on the b- side of the hv supply... usually 2a and may
be on control or bias circuit board.  could also be bias circuit fault.  

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373

-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Herbert
Sent: Sunday, August 26, 2018 20:31
To: Amps group
Subject: [Amps] Ameritron Al-1500 excessived grid current & shut down

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.


Herb, KV4FZ
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