[TenTec] Care and Feeding of Centurions
Mike Pagel, K9UW
k9uw at wi-net.com
Sun Feb 2 15:50:18 EST 2014
QST published an article called "Amplifier Care and Maintenance" in
September of 2003 and it is available (as a PDF) to members on their web
site. The article includes a flow chart for diagnosing problems.
My Centurion is ~1992 vintage and I bought it used. To date, I've replaced
several components. The tubes were first (after dropping one of them while
unpacking the amp the day it arrived!). The original fan became noisy so it
was replaced. A couple of years ago, operator error resulted in a damaged
variable capacitor (Tuning), which I replaced with guidance from Jim Rogers
at TenTec. Jim provided superb support to this appliance operator, and I
was able to handle the job without shipping the amp back to TenTec for
For some reason, Bob, I had assumed those fans were not to be lubricated.
Guess I'd better get in there.....
73, de Mike, K9UW
From: Bob McGraw - K4TAX
Sent: Sunday, February 02, 2014 2:03 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Care and Feeding of Centurions
First, disconnect the power. The voltage in this unit will KILL YOU!
Once a year, remove the case and covers. Be sure the HV shorting strap/bar
is in tact and does short the HV supply. This is when the unit is being
serviced and out of the case.
Clean the fan blades, add one drop of 3 IN 1 oil to the shaft bearings.
Take care not to bend any of the fan blades. Clean any dust from inside
the case using one of the "computer type" compressed dusters. Look for any
discolored connections, discolored areas on the PC boards and, specially at
the base of the tube sockets. If any exists, replacement or repair is
Put everything back in place and do install ALL of the screws. The amp is
ready for another year of working DX.
Proper tuning and loading and proper drive is the key to success for long
amp and tube life.
More information about the TenTec