Jim:
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:
http://n6ie.com/Ten_Tec_238.html
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
www.N6IE.com
----- Original Message -----
From: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
To: "Discussion of Ten-Tec Equipment" <tentec@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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