[TenTec] Centurion problem

[k0bx at arrl.net]

I think only the very early Centurions had the vacuum relay.
Mine and later models have relays.  Replacing it is not too hard.
BTW I had a similar problem with mine and TT had me put a jumper across a diode 
to solve the problem.

Joe K0BX

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________________________________
From: Jim Brown <k9yc at audiosystemsgroup.com>
To: tentec at contesting.com
Sent: Sun, January 6, 2013 5:56:05 PM
Subject: Re: [TenTec] Centurion problem

On 1/4/2013 2:08 PM, Doyle wrote:
> I have been having problem with my receive not returning after transmitting.  
>This also happens using either a TS-590 or Omni VI.
> 
>      Is it possible to clean the relay contacts in the amp?  Where is the relay 
>located?located.

It sounds like a vacuum relay going bad. Contacts are not accessible. You 
replace the relay.  Ten Tec is VERY expensive as a source of parts, and as a 
reapir station.  If you have reasonable soldering skills, you can replace the 
relay in an hour or two. You'll need to figure out the manufacturer's part 
number.  Ten Tec used two over the years, KiloVac and Jennings. They are very 
different physically, so you need to figure out which you have. The Jennings is 
an RJ1A, and sort of looks like a stack of nickels with leads on top. The 
KiloVac is long and skinny, with leads along the body.

You also need to know the coil voltage. I don't know the Centurion, but Titans 
use 28Vdc, and the Hercuules II uses 12Vdc.  Look at the schematic to figure out 
what the voltage is for the low voltage power supply.

These relays are widely available in the $75 range, both as "pulls": from 
mdiecal electronics, and new from a company called GigaVac. Alpha now uses 
GigaVac, and I've been using them for about five years.  GigaVac will sell them 
direct to hams at a discount, about $75, and you can also buy them from a 
dealer, Max Gain Systems.

73, Jim K9YC
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