[Hallicrafters] SX-28A 1st RF tube replacement

[mac]

Substitution probably done in an attempt to improve performance on 10M.

Dennis D.  W7QHO
Glendale, CA

On Apr 3, 2009, at 1:07 PM, Waldo Magnuson wrote:

> A friend has a SX-28A in which the first RF tube (6AB7) has been
> replaced with a miniature 6AK5 tube.  I seem to recall an article on
> the change and have looked at the archives but nothing jumped out.
> Does anyone recall of the article and can point me in the right
> direction?  Thanks.
> 73,  Skip  W7WGM
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