Six 1940 Philco tv's giveaway

[dtvmcdonald]

I am referring to the coils, both oscillator and signal, in the tuner.

Yes, they really are that stable. Considering the stiffness, its not
surprising. I would not dare try to reset mine to all current channels.
On my TRK-12 only 3 and 4 match current channels. 2, 5, and 6 exist but are
neither 1939 nor postwar channel frequencies. All sweep quite well,
and all work perfectly if fed the proper signal (made by downconverting
a signal on a cable-only channel 34-40 MHz higher). But getting them
all to tune EXACTLY right was a chore ... I had to add a piece of
copper strip to one of the "loop" inductors. (There was a sticker with the
frequencies.) I put the 1939 channel
labels on when the set was being refinished.

The TT-5 was spot on as I got it.

To say it once again, the IF strips are marvels of good design and stability!
NOT CHEAP!

I would dispute anyone who says a 630 has a better picture than my TRK12,
at least with a good signal. Modern solid state B&W monitors, with some sort
of table-lookup gamma correction are the only way to get better.

[init4fun]

Originally Posted by Electronic M

I disagree with your point. One example I can give is intercarrier audio IF. It was a WWII invention that reduced the tube count greatly, and stabilized relative fine tuning of sound and picture...So they would drift together and in the same direction as the set warmed up.

Originally Posted by David Roper

Intercarrier sound has definite advantages as well as arguable disadvantages, but it didn't affect a set's tube count. Period.

David , I'm curious as to why you think eliminating the sound IF strip and running the sound through the video IFs didn't reduce tube count ?

[Electronic M]

Originally Posted by init4fun

David , I'm curious as to why you think eliminating the sound IF strip and running the sound through the video IFs didn't reduce tube count ?

By all rights it should reduce tube count. The average split sound set had 4 video IF tubes and ~4 audio IF tubes for a total of 8. Contrast that with an intercarrier sound set that had 4 video IF tubes (that doubled as sound IF amps) and one 'sound IF' tube, for a total of 5. That is three tubes saved...Nearly a %10 reduction in a ~40 tube TV.

Perhaps David was in need of coffee, or feeling contrarian when he posted...

[David Roper]

Originally Posted by Electronic M

The average split sound set had 4 video IF tubes and ~4 audio IF tubes for a total of 8.

Average? I've never seen one. Show me.

Motorola's VK 106 is an intercarrier set with four video IF amps and three audios IF amps. Andrea's prewar 1-F-5 is a split sound set with two video IF amps and one audio IF amp. Substantially different designs, but each one's tube count appears to be wholly unaffected by the scheme of the audio stage.

Perhaps David was in need of coffee, or feeling contrarian when he posted...

Unsupported declarations bring out the contrarian in me.