[Amps] Centurion problems....

[Robert Bonner]

Whoops I'm not paying attention, 

Hello John,

The metallic tink noise could have been the glass envelopes getting very
hot. Or the bias relay clicking.

I used to own a centurion, My front panel switches were a little wacky but
it didn't do exactly what yours is doing.

What it sounds like is the B- lead is going to ground.  That will make the
plate meter read ZERO (B- metering) and it will draw NON-Biased resting
plate current.  Total ZERO BIAS like 300-350 mils.

Suspect the BREAKIN KEYING MODULE and the selector switch.  Ten-Tec switches
are crap and if you had a short in the Breakin module and it decided to
select breakin keying, it could do something like this.

I don't have a schematic laying around here for it anymore...  But I could
look through one if I had it.

The AMPLIFIER is straight forward ham stuff except for the breakin module...
SO suspect it first, HAHAHAHA

BOB DD



-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Mike McCarthy, W1NR
Sent: Friday, March 09, 2007 1:47 PM
To: john
Cc: Amps at contesting.com
Subject: Re: [Amps] Centurion problems....

What is the grid current?  Maybe a grid-cathode short?  Maybe a weak 
output relay?

Mike, W1NR

john wrote:
> 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 as 
> before.  I've looked beneath the sockets, and nothing seems to have gotten

> too hot here (or anywhere else)
>
> 	Ideas?
>
> 	John K5MO 
>
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