1951 rca kcs-47

[TUD1]

Thanks. I printed it out on my mother's printer, but right when I got to the schematic parts, the ink ran out.

[walterbeers]

For a 1951, the chassis looks clean and rust free. That's a plus for sure. Except for the top, it looks like it's a good candidate to restore and re-cap. Some scratch polish or some stain should take care of that. I don't see why it wouldn't be as good as any set of that era. I don't think any CRT set with magnetic focus looks as bright and sharp as those using the "newer" electro-static focus. Looks to be an easy set to work on and re-cap. Orange drops are good capacitors and I understand the yellow ones work well also. However orange drop caps are on the more expensive side. I use capacitors from capacitorworld dot net and have had very good luck using them. BTW they are brownish/red in color not yellow. I wouldn't worry a whole lot about the variance in the readings on the B&K CRT tester. The tester is probably working fine. The tube should "wake up" fine once you are able to get the set recapped and going again.

[TUD1]

I took the chassis out of the set so I can begin work on it tomorrow. Holy moly at all those caps...

[miniman82]

I had a chassis from around the same period, but it had a 19" metal CRT in it. No matter what I did it was just unstable on the horizontal oscillator, seemed like crappy build quality anyway.

[cluelessgame]

I'm pretty sure that's the same model TV that was in Doc's living room that started playing Howdy Doody in Back to the Future Part II

[TUD1]

We made a little bit of progress on my RCA KCS-47 today at the radio club. I meticulously checked each individual tube with a military tube tester, and after two hours, replaced all the weak ones. Amazingly, the 6BG6 tested perfect. We also replaced a 180 pF capacitor in the horizontal circuit with a silver mica. My friend who knows these things won't be there to help me next weekend, so I'm just going to change the lytics out.

[TUD1]

The KCS-47 has now been 100% recapped. It's been that way since New Years, but I haven't been able to work on the set at all because of all the junk everywhere. I put the chassis back in, got a converter box, and this is the image I saw. It also has intermittent video, where sometimes, it won't diplay an image at all. Just a grey screen with retrace lines.

[Kamakiri]

We tried to tell you

Good effort so far though!

[TUD1]

Originally Posted by Kamakiri

We tried to tell you

Good effort so far though!

If that's the image a KCS-47 produces, what's the point of buying it in 1951?

[Jeffhs]

Originally Posted by TUD1

If that's the image a KCS-47 produces, what's the point of buying it in 1951?

That image was probably taken from a set which was far from being in peak operating condition, with leaky or open capacitors and such; however, some people will watch their TVs with absolutely terrible pictures (oversaturated colors, too bright, shrunken ...), and won't mind it a bit, as long as they can see their favorite shows. (I knew a family some years ago who was like that.) Don't forget, television was still a novelty in the early 1950s. The state of the art was nowhere near as advanced in 1951 as it is today; everyone had to make do with what was available at the time. This means that even when the set was in perfect (!) working order, it still did not produce that great a picture by today's standards; however, given the state of the TV art in the 1950s, the picture may have been regarded as very good.

The KCS-47 chassis can produce excellent pictures (given a decent signal), and it probably did when it was new. I used to watch one years ago (long before DTV); it had a great picture on all three (at the time, 1970s) Cleveland VHF television stations and using rabbit ears as an antenna.

Remember that VHF television stations in the 1950s did not have much power (this was long before the age of super-power UHF stations with signals in the megawatt range). Most folks used outdoor antennas to get the signals, although if you were close to the towers (within twenty miles or so), you could probably get by with rabbit ears. I had an aunt who lived in Independence, Ohio, which is quite close to Cleveland's TV towers; she could get every Cleveland station in color just by using a short length of wire on one of the antenna terminals. My grandmother, who lived in the city of Cleveland near the suburb of Shaker Heights, got excellent reception of all three network stations on her '51 GE 16" console, using only rabbit ears, in the 1950s until she got a color set in 1969. Even then, she was getting excellent color reception, even on the PBS affiliate (then NET), with just an indoor antenna.

Of course, these days, with almost all TV being on cable and/or streaming video, the reception issue is fast becoming a moot point. As I read in an issue of TV Technology a few minutes ago, before starting to write this, the FCC wants to eliminate broadcast TV altogether, since so many folks are watching TV via the Internet and other platforms which do not rely on RF signals.

The day may come when there will no longer be any such thing as over-the-air television. I think that day may come sooner rather than later, given the popularity of streaming video over the Internet. I personally do not watch OTA TV anymore, since getting a Roku player over a year ago (I upgraded mine late last year, and still have my first one). I hooked up the little box to my 19" flat screen and did not look back. The only reason I have a cable account with Spectrum (formerly Time Warner) at all these days is so the Roku Spectrum TV app will receive local channels. No cable account (the cable need not, however, be physically connected to the television), no local TV. That's just the way it is and has always been with this cable operator. I think (in fact, I am almost certain) they are doing it this way to be able to pay for the privilege of carrying local TV signals (in any area served by Spectrum, not just northeast Ohio) through the Spectrum app. They could never get away with it otherwise.

[Electronic M]

Originally Posted by Kamakiri

We tried to tell you

Good effort so far though!

Someone on ARF (Bill Cahill?) had something like a 15 page thread on their repairs on one...Every time they had it working decent something new would blow or burn...I don't think you could give me one of those sets.

[SwizzyMan]

It seems like RCA's sets from about 1949 to 51 or 52 were pretty crappy build quality and not well designed. The KCS-49 being a great example of this. Things started picking up though when RCA got into color sets I believe.

[kvflyer]

Originally Posted by Electronic M

Someone on ARF (Bill Cahill?) had something like a 15 page thread on their repairs on one...Every time they had it working decent something new would blow or burn...I don't think you could give me one of those sets.

This one?

http://antiqueradios.com/forums/view...p?f=3&t=73266&

[jr_tech]

How about a KCS45... same garbage??

Years ago, I packed home a 2T51 12 inch set in a bakelite cabinet, and repaired it by replacing a few tubes and a few caps. It was never very stable, so it became a "shelf queen", with the thought that sometime I would perhaps give it a full recap/rebuild.

Now 20+ years later, I am considering working on the set again, but from the above comments about the KCS47, l am wondering if that might just be a waste of time.

Cute little set, however:

http://www.tvhistory.tv/1950-RCA-2T51-12in.jpg

What say the experts?

jr

[Kevin Kuehn]

I also have one of those 2T51 that I've never restored. I can't imagine it would be too difficult to revert some of the circuitry to an earlier more stable design. Apparently the sync circuit is a weak link? I guess I'll get mine operational as a video monitor first and proceed from there.