I have a Trio preselector identified in my inventory
as an SM-1 but the booklet for it seems to have
disappeared from my files. These were offered in
kit form or "factory wired"... mine is factory wired
and in near mint condition. My rf amplifier tubes
are both 6BA6. It says "Signamax" on the tuning
dial. VE7AFN.


"K3HVG" wrote in message
. ..
I just picked up what appears to be a Trio (Kenwood?) model SM-1
tube-type HF preselector. I can dope it out for the connections to fil
and B+ but can anyone provide type of tubes used? They are both 7-pin
miniature and the fils are pins 3 and 4. Could be 6BA6 or 6BZ6, maybe?
Its a 2-stage device and may be a converter instead of a preselector?
Two sets(decks) of coils and compression trimmers. The vintage is said
to be in the 50's but can't confirm. The size is about like a Heath
VF-1 VFO and typical of early Trio/Kenwood gear. Logo says Trio but
unlike any Trio logo I've seen on their early ham gear. There is a
picture and reference to it being a preselector on a JA's website but no
joy on anything else. Any info would be appreciated. de K3HVG