[BC] The ultimate radio?

Gary Peterson kzerocx
Wed Dec 7 07:56:02 CST 2005


>There were 1v acorns- 957, 958 and 959.  Got a few in my collection but no
equipment to use them in.  Do >have a Hallicrafters
>S-36 with the standard acorns, though.
>Scott Todd

Does the S-36 use acorn tubes because it features VHF coverage?  I've parted
out an old radiosonde (sp?) and plan to use the acorn tube for a 40 meter
QRP transmitter.

Speaking of small tubes...when I was in high school, I converted a surplus
URC-4 lifeboat radio to 2 meter AM for bicycle mobile.  The receiver was a
super-regen.  My best DX on 147.6 Mc was about ten miles.  The emergency
radio used sub-miniature tubes that required 1.5V for filaments and 90V for
B+.  My B+ source was a pair of 45V batteries that I fished out of a garbage
can behind the telephone office.  The tubes were about the diameter of a #2
pencil and 1-1/2" long.

The reason that I was so amused by the idea of building a, possibly
regenerative, radio out of a 304TL is the interference potential.  A friend
built a single-stage regen out of an old Cunningham 112-A.  When powered by
batteries and hooked to a 110 ft. wire antenna, it could be heard for over
five miles when it broke into oscillation.

Gary, K?CX



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