Brian Denley wrote:

WShoots1 wrote:

Brian: The typical tube radios usually had chokes at one end and
trim caps for the other band end and you had to go back and forth as
the poster described.
There is a set for each band. ..

That sounds like the high end receivrs.

The lesser ones I recall had trimmer capacitors for one end of the
frequency range and padder capacitors for the other.

Bill, K5BY

Bill:
You could be right. I was using, my HQ-150 as an example but the SX-28 is
the same as I recall.

The early boatanchors used air core coils (non-adjustable) with padder
cap's for the low end and trimmer caps' on the high end. Newer models
used ferrite core coils (adjustable) which eliminated the padder caps'
and greatly improved the 'Q' (selectivity) of the tuned circuit.


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