Quote:
Originally Posted by maxhifi
I think it's cool how this model is FM stereo, but yet uses a 12AL5 as a detector, and looks like two parallel 35W4s. Does it do AM/FM stereo as well, with AM in one channel and FM in the other? it appears to have two separate tuning dials.
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No, not unless there are two tuning knobs, one for AM, the other for FM -- and I only see one. I believe this radio is true stereo FM, because of the MPX decoder; if this is correct, there would be no need for AM-FM stereo capability. AM-FM stereo was the first and a very crude method of producing stereo FM, using signals from an AM and an FM station broadcasting the right and left channels (or vice-versa), respectively; the system had many shortcomings, and was abandoned when stereo multiplex was developed and introduced in the early 1960s.
Your JVC radio may appear to have two independent tuners, but I don't think it does. The dial drive may be arranged such that the AM and FM tuning capacitors are tuned at the same time when the front panel tuning knob is rotated -- and I'll bet it was a nightmare to repair if the dial cord broke and had to be restrung.
BTW, I wonder why this radio was designed and built with
two 35W4 rectifiers; most AC-DC sets use just one. The only reason I can see for using two rectifiers in this radio is that it may have unusually powerful amplifiers and/or preamplifiers, or was designed to drive (optionally) large external high-fidelity speakers such as are found in stereo hi-fi systems.