If this is the amp that uses three 811A tubes it is pretty common for that
type of tube to get a grid/cathode short.
Since your problem goes away after you let the amp cool down and then comes
back when it warms up I would suspect a tube problem. The good news is that
the 811A tubes are still pretty cheap!
GL & 73
Bill - K6WLM
----- Original Message -----
From: "Ron Zond" <k3miy@csonline.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Friday, March 09, 2007 3:44 PM
Subject: Re: [TenTec] Centurion probs
Hi John
I don't have an amp, but it sounds as if you
lost bias ( if the finals require bias) Check the bias circuit.
ron
K3MIY
-----Original Message-----
From: tentec-bounces@contesting.com
[mailto:tentec-bounces@contesting.com]On Behalf Of john
Sent: Friday, March 09, 2007 2:30 PM
To: tentec@contesting.com
Subject: [TenTec] Centurion probs
I've had a recent failure with my Centurion... was operating it about 600
watts out, when I heard a "TICK" noise (sounded mechanical, not
electrical)
and noted that output power dropped. Plate voltage was still normal, but
no
indicated plate current).
I happened to look into the grill on the top and the PA plates were red.
Turned everything off, then back on a day later, at first all was well,
then the same thing happened again ...amp was normal, then output power
dropped to exciter levels, and the plates began getting hot
Ideas?
John K5MO
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