1970s Sears TVs

[dieseljeep]

Originally Posted by centralradio

Thanks for the info guys.My late father had a Sears 25 inch TV from around 1974 that he got alot of time out of it like 12 year before the CRT went on it and he got a Zenith 25 inch Stereo TV in 1986. I got the Sears chassis somewhere here from it.I wish I grab the Zenith before he had the box store cart it away when he got the JVC set in the 1990's.I have a Sears 19 inch hybrid here that I fixed in electronics class in high school.It had a burned out power supp diode and gave it a fresh horizontal output tube . As I remember .I got an A on that for extra credit.As I remember .I think these set were not Japanese made sets as I remember the semiconductors were those idiot USA house numbers and not the common JEDEC 2SA,2SB,2SC and 2SD part numbers.

I think, I have one of those!
It's a Warwick-built set using a slightly different color demod circuit using a 5MK8 and a 12MD8. Also used a 11AF9, video out. Going by memory!
I rather liked those sets.
I bought it from Mark, "Zenithfan" who got it from Doug, so it stayed in the family, so to speak!

[centralradio]

Originally Posted by dieseljeep

I think, I have one of those!
It's a Warwick-built set using a slightly different color demod circuit using a 5MK8 and a 12MD8. Also used a 11AF9, video out. Going by memory!
I rather liked those sets.
I bought it from Mark, "Zenithfan" who got it from Doug, so it stayed in the family, so to speak!

OK thanks.I cant recall what the tube lineup in the hybrid but it looked like a rats nest in there along with the BS house number transistors in them.

[dieseljeep]

Originally Posted by centralradio

OK thanks.I cant recall what the tube lineup in the hybrid but it looked like a rats nest in there along with the BS house number transistors in them.

It's a well-known that they all did it that way!
RCA, Zenith, Motorola and the rest of them, all had their own private numbered semiconductors used. You had to look up the numbers in the ECG or TCG cross reference manuals, or consult the Sams for the replacement.
Some of the firms used selected devices, like Sony. If a generic replacement was used, the repair wouldn't last. Guess who had to make good on the rework.

[centralradio]

Originally Posted by dieseljeep

It's a well-known that they all did it that way!
RCA, Zenith, Motorola and the rest of them, all had their own private numbered semiconductors used. You had to look up the numbers in the ECG or TCG cross reference manuals, or consult the Sams for the replacement.
Some of the firms used selected devices, like Sony. If a generic replacement was used, the repair wouldn't last. Guess who had to make good on the rework.

Yes .I know.I'd dealt with those nightmare repairs back in the 1980's and 90's in the shop.Atlease Zenith,RCA ,Sylvania and Magnavox were alittle better.Not to sound anti American but I rather service a Sony,Panasonic,JVC ETC Japanese set or any other set that uses the JEDEC parts.