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Re: [Amps] Ameritron Al-1500 excessive grid current & shut down

To: "'w8hw'" <>, "'Herbert Schoenbohm'" <>, "'Amps group'" <>
Subject: Re: [Amps] Ameritron Al-1500 excessive grid current & shut down
From: "Doug Renwick" <>
Date: Mon, 27 Aug 2018 14:40:02 -0600
List-post: <>
It's Diode D16 a 1N4007 on the filter capacitor board. It's easy to replace.


"Political correctness is a weapon used to silence people who tell the
truth" - Ayaan Hirsi Ali 

-----Original Message-----
From: Amps [] On Behalf Of w8hw
Sent: August-27-18 7:40 AM
To: Herbert Schoenbohm; Amps group
Subject: Re: [Amps] Ameritron Al-1500 excessived grid current & shut down

90% of the time it is a diode on the hv board that is near the edge. If 
I were home, I could give you the exact one, but won't be home in 
Florida for a week (Sept 3). I repair amps and have worked on that 
problem on that exact amp many times, and only once was it the tube. 
Hope that helps. 73, Bruce, W8HW

On 8/26/2018 4:30 PM, Herbert Schoenbohm 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
> 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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