Hallicrafters model 600

[stusnyder]

Anybody on here own one of these? I have a chance to get one. Just wondering how common they are.

[dieseljeep]

Originally Posted by stusnyder

Anybody on here own one of these? I have a chance to get one. Just wondering how ommon they are.

I don't think too many of them survived. The last one I worked on was 40+ years ago. Most of them had a continuous tuner. They used that same chassis in models all the way up to 19" round. They even made them for Sears and others.

[Jeffhs]

Originally Posted by dieseljeep

I don't think too many of them survived. The last one I worked on was 40+ years ago. Most of them had a continuous tuner. They used that same chassis in models all the way up to 19" round. They even made them for Sears and others.

One learns something new every day.

I didn't know until now that Hallicrafters TVs had mostly continuous tuners (including FM between channels 6 and 7). I've seen photos of some Hallicrafters TVs from the late 1940s (table models with a very small picture -- couldn't have been more than 5 inches diagonal) with the push-button channel selector, which included channel 1, and a separate small fine-tuning control located next to the button for channel 13. Never saw a Hallicrafters television, however, with knob tuning -- continuous or otherwise. The set you worked on in the early '70s or late '60s must have been one of the knob-tuned models.

I did not realize, either, that Hallicrafters made the chassis for TVs sold under the Sears brand name, let alone other house brands. Always thought Hallicrafters televisions were made decades before anyone ever heard of rebadging home entertainment gear.

[dieseljeep]

I don't remember those sets getting FM between the channels of 6&7 like the Dumonts. The tuner was a 3 tube job. The later Halli's had a turret tuner with printed circuit strips. Two tubes. They claimed, they made it themselves. The small seven inch e'stats were built for Wards and Delco.

[Reece]

Rebadging home entertainment gear was done from the beginning of radio. Sears and Wards and others sold sets in the twenties with their names on them, made by others.

[Jeffhs]

Originally Posted by dieseljeep

I don't remember those sets getting FM between the channels of 6&7 like the Dumonts.

That's strange. I would think any TV tuner built for continuous tuning would have to tune from 88 to 108 MHz, and then some (as did the DuMont Inputuner continuous tuner), since the FM broadcast band (and also the old, now obsolete 152-174 MHz police band, not to mention the 108-136 MHz aircraft band and whatever was between 136 and 152 MHz) are right in between channels 6 and 7. How did Hallicrafters design their continuous tuners to skip over the FM broadcast band when tuning from channel 6 to 7? scratch2: The only thing I can come up with is that the tuners had a high/low band switch, on the set or a switch on the back of the tuner, activated by the tuning knob on the TV itself, that switched the tuner directly to channel 7 from 6, thereby completely skipping the frequencies in between. That or else the TV had two separate tuners with separate tuning knobs on the front of the set, one for channels 2-6, the other for 7 to 13.

[jr_tech]

Originally Posted by Jeffhs

The only thing I can come up with is that the tuners had a high/low band switch, on the set or a switch on the back of the tuner, activated by the tuning knob on the TV itself, that switched the tuner directly to channel 7 from 6, thereby completely skipping the frequencies in between.

The tuner had 2 sets of antenna, oscillator and mixer coils. A 6 pole double throw switch, activated by the tuning knob switched from the low band to high band coil sets.

jr

[wa2ise]

Originally Posted by Jeffhs

That's strange. I would think any TV tuner built for continuous tuning would have to tune from 88 to 108 MHz, ...and whatever was between 136 and 152 MHz)

That includes the 2 meter ham radio band, 144 to 148MHz. Mostly narrow band FM comms.

If the TV set used intercarrier for the sound, you wouldn't be able to tune in FM radio stations all that well. Oh, if two stations were 4.5MHz apart, you'd get some garbled mix of the two stations.

If the tuner was truely continious between 6 and 7, today it would be "cable ready"

[Einar72]

Betcha it has split IF's

[jr_tech]

Nope! The 600 is intercarrier; 3 video IF stages followed by a detector with the sound taken off at second video amp, into 1 sound IF, ratio detector then amp to speaker. It does not tune the FM band, as it uses Hi band/Low band switching.

jr