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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>
>
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