Drake SSR-1
Just acquired one of these for no better reasons than it was only twenty quid and I have never had a Wadley loop receiver before.
I looked around the internet before it arrived and there are apparently two versions - one all bipolar and with a slightly odd system for the 1 MHz harmonic generator of an astable multivibrator directly synchronised to a 10 MHz crystal osc. The other version with mosfets in the local oscillators and a rather more sanitary harmonic generator using a 7490 decade counter between the crystal and astable oscs.
Curious to know which type I had, I pulled the cover off as soon as it arrived; neither - yes to bipolar local oscs but a 'kludge' board on the back of the harmonic gen with the 7490 on it!
NHH
__________________
B.Rgds Nick H.
BVWS member
|