Hello Stan,
If you can "monitor" the following problem (i.e. the needles of both
meters showing the same values and moving exactly the same way),
it is just a matter of grid current readout (the tube is fine).
Replace the 1N4007 (300-0266) in the filter board (check it out before
to be sure it's dead !), and your AL-1500 will work fine again ! It's
very usual that this diode burns when a flashover occurs in an AL1500.
Hope that helps.
Vy 73
Herve F5HRY
www.win-test.com
www.fy5ke.org
----- Original Message -----
From: <k5go@cox.net>
To: <amps@contesting.com>
Sent: Sunday, August 14, 2005 3:16 AM
Subject: [Amps] AL-1500
> I'm sick after using one of my AL-1500 amplifiers to check an unknown
8877. High voltage came up fine but when I closed the relay with about 5
watts drive, it immediately blew both mains fuses. I replaced the defective
tube with the original, and it does not blow fuses but the grid current
shows higher than it should with very little drive and does not decrease
with heavier loading. I knew something was wrong and stopped at about 400
watts before applying more drive. Any input before I start diaassembling the
thing would be appreciated.
>
> Stan, K5GO
>
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>
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