Looking thru a friend's Feb 2009 QST, saw an article on the W6TC "HBR"
double conversion homebrew radio. Which my father may have built a copy
of. I no longer have that radio, but looking at the pictures of teh sets
in the QST article, it looks very similar to what my father built. I do
remember that he used a 1.8MHz crystal for what might have been the 1st IF
to 2nd IF conversion mixer. I also remember, in the mid 60's (I was in
grammar school) getting this crystal for my father as an Xmas gift (well, I
gave him money that he used to order the crystal, I would not have been old
enough to know how to mail order stuff myself yet).

Anyway, did the HBR use a crystal of a frequency like this as a conversion
local osc mixer? Or maybe the crystal wasn't in an oscillator circuit, but
maybe as a bandpass filter?