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Re: [TenTec] Corsair II realignment: DIY?

To: tentec@contesting.com
Subject: Re: [TenTec] Corsair II realignment: DIY?
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Reply-to: geraldj@weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 01 Jan 2011 13:41:07 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Miniature electrolytics are ripe for replacement due to old age. Go for 
low ESR high temperature rated for the best performance and long life. 
Don't forget those on the display board. I doubt Tentec would consider 
shotgun replacement of electrolytics to be practical at their costs of 

As for alignment, if it hears antenna noise louder than its noise on all 
bands and puts out rated power everywhere, I don't think it needs 
alignment. I've never found alignment a better procedure than proper 
signal tracing for troubleshooting and problems. Indeed alignment can 
introduce more problems from adjusting parts that didn't need adjusting 
but were frozen with age. Split cores come to mind, NEVER use a metal 
allen wrench on a core of a coil. It gets a thousand times harder to 
turn after its split by the metal wrench. Use only plastic alignment 
tools that fit the cores. Alignment was needed more in tube radios where 
tube replacement was commonly required and the tube capacitances were a 
significant portion of the resonann circuit tuning C. Then a different 
tube with 1 pf different C required alignment. We aren't swapping 
transistors that much, though when a transistor is replaced and its 
connected to tuned circuits, alignment of that stage is most appropriate.

73, Jerry, K0CQ

On 1/1/2011 12:21 PM, Andrew Moore wrote:
> I've got the Corsair II on the bench for a PTO cleaning or possible rebuild.
> While I'm at it, I'm considering
> a) complete realignment
> b) replace any components that may go out of spec due to age
>    (would electrolytic caps fall into that category?)
> I realize there's also a "don't fix it if it ain't broke" angle but I'm
> leaning towards realignment/replacement.
> Seeking opinions on a) and b) above.
> I don't have a scope, but do have a multimeter, wideband noise generator,
> and test oscillator for 20/40/80 meters.  Better off sending it to Ten-Tec
> (if they still do this), or do it myself?
> Who's "been there done that?"
> Thanks,
> --Andrew, NV1B
> ..
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