Hi Martin,
I don't know which type of tubes this amp is using, but either it's
oscillation or it's DC drift due to unstable grid/screen voltage(s).
73's, Evert PA2KW
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Martin Kratoska
Sent: Sunday, May 18, 2008 14:09
To: amps@contesting.com
Subject: [Amps] Excessive grid current - AL811HXCE
A friend of mine has an AL811HXCE which started to behave wild. After
switching on, the amp works like a champ but after a warm up period the
grid current goes from normal 100-150 mA to that level which can't be
measured, the meter needle bumps to its stop. When switching off and
leaving a minute, the grid current returns back to normal (after a warm
up period it goes to wild values again).
I never seen this amp but collecting ideas what to do because I plan to
go there and help to repair it.
73,
Martin, OK1RR
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|