Quote:
Originally Posted by Jeffhs
Not only that, but this one has the permeability-tuned FM tuner. I thought it would after I saw the linear FM tuning scale, so I wasn't surprised when I saw the tuner under the chassis. The other interesting thing (to me, anyway) about this radio is the unique dial drive system, which tunes AM and FM simultaneously. The only thing I don't like about that design is just that, i.e. the AM and FM dials move together when you turn the tuning knob. I have a feeling this might have been a cost-cutting measure by Zenith in the late '60s, so they didn't have to use a separate dial drive and tuning knob for each band. The only FM tuners I ever saw with such a tuning arrangement (separate dial drives for AM and FM) were the ones that were designed for the old AM-FM stereo broadcast standard, which of course was abandoned when multiplexed FM broadcasting became the new standard for stereo FM.
Another cost-cutting feature was the lack of a tweeter speaker, as was used in the early '60s Zenith radios; at least I didn't see a separate tweeter in this one. The large pulley driving the dial cord is in the position where I would have expected to see such a speaker. The only thing I can think of that would have prompted Zenith to design these late '60s radios without tweeters is the solid-state design; the audio output transistor may not have been powerful enough to drive the main speaker and a tweeter as well. The earlier Zeniths with tweeters (K731, C845, et al.) drove them directly from the plate of the audio output tube.
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The electrostatic tweeters needed high voltage to run which the transistor stage may not have been capable of.
Grundig had an non-simulcast system with separate dial strings and a single knob (most european makers used concentric knobs on dual string tuners) with a clutch mechanism linked to the band switch that would swithc which string the knob drove based on the band selected. I had an SO-205-U console with that tuning mech and it was a total cluster f^ck.