[Collins] re problem with preselector not tracking on kwm-2a

[Dr. Gerald N. Johnson]

On Mon, 2009-05-11 at 20:24 -0600, Fern wrote:
> What vintage would a kwm-2a with serial number #37K be?  Thanks from Fern
> 
Impossible to tell by the SN since they were issued in random order.

Look for date codes on crystals, tubes, and electrolytics. Check the
balanced mixer circuit. Look in the latest down loadable manual for
circuit changes. There is an extensive list in the beginning of chapter
7.
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer