video uploads by Brian Comnes
Update:
"It's all analog for sure , from 1938!! Don Buchla was 1 year old at the time. Bob Moog was 4 !! Daphne Oram was only 13. It uses two heterodyned tubes oscillating around 80k hz and uses a monster variable capacitor to generate the differential frequency much akin to that used in a tube based theremin, and then to an internal tube amplifier
Best part of this device is it sweeps continuously from 40k hz to about 9k. Most bench oscillators have stepped narrower ranges Here's some vids. "
via this auction
"Used Clough Brengle Beat Frequency Oscillator Model 79C
Estimated from 1937 in good working order. see videos
This an all tube analog oscillator capable of sweeping form 30 hz to 9k hz CONTINUOUSLY .
All orIginal to my knowledge. MassiVe transformers, this thing weighs in at 20 pounds (which will make shipping a bit pricey) Has new grounded power cord
Includes one connector cable."
