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Originally Posted by jr_tech
Do you have a schematic showing the same tuner with a UHF strip? I believe the design of the strip was quite different, using the extra contact (1) to switch the UHF mixer diode into the circuit for UHF mixing. IIRC, there were also more coils that were used to double or triple the local oscillator frequency, since the 6J6 likely was a poor oscillator in the UHF range.
jr
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Alas I do not. Very little is known about the fleetwood sets from Canada; I was fortunate to have the manual with this one else I would have been up a creek without a paddle restoring it. (full scan here:
http://vintagepc.site50.net/site/fleetwoodtv/service/) It shows a picture of the tuner (P. 5) and that's about it. The only other mention is on P.2 (
http://vintagepc.site50.net/site/fle...e/TV_002.png):
Quote:
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Cascode Tuner - for clean pictures without snow, high sensitivity in fringe areas. Easily adaptable to UHF reception.
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I've tried googling "Cascode tuner" in the past expecting it was a particular design or brand implementation but that was trying to find a grain of sand in a manure pile.
(Edit: whaddaya know- dieseljeep mentioned those in his post on UHF strips by standard coil. Now I'm even more interested in trying to reverse engineer something out of this)
GE's 6J6 datasheet says it can run up to 600 Mhz if configured in PP mode with the two halves tied together... which might be doable with bridging some pins on the strip, and certainly covers _some_ of the UHF range.
There may be some info in the RCC service info, I asked JustRadios but I don't think they had any info on this set.