Note that the Lafayette AM transistor set below is tuned to
Here's a wav file of the WABC Chime!
jingle. And another wav file
of Dan Ingram goofing
on Donna Summer's "Love to Love you". More radio station
jingles click here.
The above left AM transistor is Lafayette #17-0102L, next to it is an
AM/FM set Lafayette #99-3524. AKA 99-35248L.
The above Lafayette looks just like this above Koyo 10 transistor.
got the Lafayette new, model FS-129L, mid 60's.
Lafayette model 17-0107, also my brother's
Truetone sold a virtually identical radio to the above:
A 6 volt tube car radio: powered
by a PC supply.
More tube radios
The Motorola radio on the right has 7 tubes
and a 3 gang tuning capacitor. Date on circuit board:
"1960". Uses normally a 12BA6 RF,
12BE6 converter, normally a 12BA6 for the IF,
12AV6 detector and first audio, another 12AV6 for
a phase splitter to drive a pair of 35C5's for
push-pull audio output, and a
selenium rectifier. I substituted a 12BZ6
in the IF stage for more gain. The 12BZ6 has about
twice the transconductance of the 12BA6, and about the
same plate resistance, which would
yield about 6dB more gain (assuming no AVC action).
The pinout of these tubes are slightly different, the
cathode and supressor (G3) grid pins are swapped. I didn't
rewire the socket, things worked fine with the orginal
wiring (circuit boards are hard to change anyway).
The bias from the AVC line is sufficient to operate this tube.
No problems with unstabilities, this radio uses tube shields,
which helps. The 12BZ6 in the RF stage was unstable, so
I used a 19HR6 instead. The 19HR6 has the same pinout as the
12BA6 and twice the gain (again, assuming no AVC action).
The 19HR6 is stable in this
Makes for a good DX set.
I used 6AQ6's in place of the 12AV6's to keep the
heater string voltages from adding up past 125V.
Motorola AM/FM -----»
digital clock radio, analog tuned
A Canadian radio:
It's ready for the extended AM band