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FYI, most VHF tuners have a dual-gate MOSFET for a mixer and RF amp. I've got a ham buddy that harvests the MOSFETs from VHF manual tuners from the 70's - he uses them in his ham gear repairs - they are apparently useable at all VHF frequencies, and he appreciates the ferrite beads in the tuners as well. I dunno if there are any other uses for the VHF tuners.
I remember when the continuous tune UHF tuners were all the rage - by modifying the plates, the tuners could tune in above 1 GHZ, and still produce a 45-55 MHz IF output. I guess the varactor tuners ended that rage. The varactor tuners from Zenith were sought after for cable descramblers - some Hotel/motel sets had the hardware to do Suppressed Sine decoding. PTS required a hefty dud fee on those, I recall. We serviced some that were used in Navy barracks, but didn't use the SSI decoding, as our cable system used an addressed system.
Cheers,
__________________
Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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