[TenTec] Ig drift on amps

Ron Castro ronc at sonic.net
Sat Feb 7 19:29:13 EST 2009


I never actually burned up a cap in mine, but I did let some 'magic smoke' 
out on at least one occasion, which prompted me to replace most of the caps 
with surplus Russian military doorknob units.  Here is my article on it:


I the last picture, you can see some minor smoke damage on the chassis.  The 
conversion works super, and I can run my ACOM 2000A on 160 into a bent 
sloper with no problem.

BTW...it was good seeing you at the REDXA meeting last month!

         Ron  N6IE

----- Original Message ----- 
From: "Jim Brown K9YC" <k9yc at audiosystemsgroup.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Saturday, February 07, 2009 2:49 PM
Subject: Re: [TenTec] Ig drift on amps

> On Sat, 7 Feb 2009 16:09:07 -0600, Duane Calvin wrote:
>>Yes, Ron, I've experienced the same symptoms in my 238B
> Ten Tec uses N1500 caps in the 229 and 238 tuners. Some matching
> conditions cause these caps to carry a lot of current, enough to
> cause them to change value by a fair amount. There are also matching
> conditions that cause them to burn up. I run 229s and 238s with my
> Titan during contests at the 1.2 kw level. I own six of these
> tuners, and I've fried at least one cap in all but one of them.
> On the oldest of my tuners, a 229B, I had enough heating around the
> front end of the rotary inductor to toast the spring that holds the
> traveling tap in contact with the inductor. I managed to repair it
> with a replacement spring that I found in a surplus house.
> 73,
> Jim K9YC
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