Jim: The 229/238 will run at legal limit for quite a while on almost all
bands. The problemrears it's head on 160 meters where you might run into some
weird mis-matches. At lowpower it seems to work OK but at hight power, the .01
disc caps just cannot handle the
current. I found some Russian caps for around $30 to replace the stock caps.
Now my229A remains quite cool. I believe this thing will tune the proverbial
wet noodle in a copperbox! I have had several match boxes over the years and I
will not part with this one.
If you do not use 160 meters, then this mod is un-needed.
73 Clayton N4EV
From: Jim Brown <k9yc@audiosystemsgroup.com>
To: tentec@contesting.com
Sent: Wednesday, February 17, 2016 6:14 PM
Subject: Re: [TenTec] Ten-Tec 229A Tuner Value
On Wed,2/17/2016 9:46 AM, Gary H. Harmon, Jr. wrote:
> Is there a written mod somewhere about replacing the caps and which ones?
I've seen recommendations to replace all of the fixed caps with
doorknobs. That's a bit of overkill. :)
I ran my Ten Tec 229 and 238 tuners at legal limit, and there were
several caps that eventually blew. I don't remember exactly which ones,
but I do remember one that was at the rear of the bandswitch. I'm using
surplus HV caps with relatively low temperature coefficients (N750 or
N330), low ESR (equiv series resistance) and high current handling. The
caps I use came from browsing the aisles at this surplus house. It's
unlikely that you can do any good online.
http://www.halted.com/
73, Jim K9YC
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