RCA 21CT55 B8802897 is Alive!

[stromberg6]

Originally Posted by andy

I believe RCA made a chassis in the early 80's with I Q processing. I think it was a CTC13X chassis, but I forget the exact chassis number.

My CTC-136B is wide-band, manufactured in 1986, and has the I-Q chipset. I'll look at the SAMS to see about the single-ended I delay line. I'm getting much from the topic of the "glow" that may be due to grid contamination. I'll see if I can find an hour or more later tonight to fire up my 4, and look for the glow. Thanks for all the info!
Kevin

[JBL_1]

Originally Posted by stromberg6

My CTC-136B is wide-band, manufactured in 1986, and has the I-Q chipset. I'll look at the SAMS to see about the single-ended I delay line. I'm getting much from the topic of the "glow" that may be due to grid contamination. I'll see if I can find an hour or more later tonight to fire up my 4, and look for the glow. Thanks for all the info!
Kevin

Just poking around and saw this thread. I was designing televisions at RCA in Indianapolis when the CTC-136 was made. While the Sanyo IC has I/Q demodulation it did not have the wide I channel that was only used in the CTC-131 and CTC-132. I seem to remember the short lived CTC-133 used the same RCA designed chip but the wide I feature was not incorporated. The CTC-121 was the first 25" in the space of a 19" but did not have the Wide I processing..

In those days RCA designed all the IC's in their receivers. I designed the deflection processor in the CTC-146. RCA in Sommerville was the first source and Hitachi was the second source. I remember having to tweak some resistors in the 32 h input circuit as hitachi's transistors behaved a little
different than RCA's.

The CTC-131 chip set included a wide I demodulator and a kine drive IC with auto kine bias. Those were the days....

The CTC-135/136 was a low end chassis designed by RCA Taiwan and overseen by Indianapolis. It used a Sanyo chip that was modified to meet RCA's specs.

I wish i could remember why the Wide I was removed from the CTC-133. Seems there was some reason.. I may have some of those IC's around if I can find them!

[stromberg6]

JBL-1, my previous post stated that I had a CTC-136B, but it's a 133B. There's a 135 in my daughter's bedroom, and it's not bad for a little Taiwan TV.
I wasn't aware that the I wasn't wide-band in the 133. The color resolution on my set is really good when compared to the narrow band TV's in the house, and it will reproduce small detail in color, oranges and cyans, etc, but a really good picture. Interesting information, and I thank you for it. I'll look for more info on this and similar chassis where ever I can find it.
Kevin