1967 Zenith 24NC31Z roundie color tv - Page 3 - Videokarma.org TV - Video

consoleguy67 · #31 10-22-2011, 02:05 AM

Hi Tom,
The two red knobs might work, but the tan ones seem like they may be too short.

Thanks,
Frank

Electronic M · #32 10-22-2011, 02:57 PM

I'll try to dig them out and get better pictures for you this weekend.

consoleguy67 · #33 10-22-2011, 05:34 PM

Thanks Tom.

consoleguy67 · #34 10-26-2011, 04:46 PM

Hi All,

I finally have pictures of this beast working. The cabinet is not the best, and it does not have it's original legs, but it does give a great picture.

mstaton · #35 10-26-2011, 06:12 PM

looks nice!

consoleguy67 · #36 12-09-2011, 03:06 PM

Hi all,
This set has now developed a new problem; the contrast seems to flicker from dark to light, and every once in a while, the picture will break up. I know it's not the signal source. Also, when it is first turned on, it also seems to take a while to lock on to horizontal. Any ideas where to look first?

Thanks,
Frank

DaveWM · #37 12-09-2011, 04:02 PM

could be AGC acting up. does the contrast adj work ok? try wiggling the AGC tubes, move the agc adj pot back and forth a bit.

If it was just a horz issue I would guess the AFC diodes, but if is seems like the pic fade is with the sync lock, the AGC is suspect.

If you have a variable dc source you could try clamping the AGC and see if that settles it down, check the 4uf cap in the AGC circuit.

consoleguy67 · #38 12-20-2011, 08:32 PM

Does anyone have the bulb number for the channel light? The number lights up in the panel above the knob. I know Doug had it in an earlier post.

Jeffhs · #39 12-21-2011, 07:41 PM

Quote:

Originally Posted by consoleguy67

Does anyone have the bulb number for the channel light? The number lights up in the panel above the knob. I know Doug had it in an earlier post.

If the set used what I call a light-through channel selector knob (the kind with little filmstrips around the inside of the knob bearing the channel numbers and UHF, through which the pilot light shone and projected the number onto a small screen in the center of the knob) Zenith sets used in the '60s, I'd guess the correct replacement would be #47, as used in flashlights, but that's only a guess; later sets such as yours, with a channel indicator that lit up translucent numbers on a disk in a panel above the selector knob, may well use a different type of bulb, even in a different base. Use of the incorrect type of bulb may result in premature failures, if the bulb happens to be rated, say, for four volts and the pilot-light supply winding on the power transformer supplies six volts or more. Doug would almost certainly know more about that than I since he has had more experience with Zenith televisions than I ever did, and probably ever will.

compucat · #40 12-24-2011, 07:01 AM

The Zenith sets used the bayonet base bulbs. They are the same type you find in the dial lights of most 1940s table radios