Nearly finished with this RCA 21D7487

[Eric H]

This set is from 1957.

I took the chassis out for a preliminary examination, to remove it you also have to unbolt the tuner from the side of the cabinet and remove that along with the chassis, a cumbersome situation to say the least.

Knowing the RCA often put a mounting location on their color sets for the convergence board to sit while servicing the chassis I started looking for something similar on this, it only took a minute since the length of the wires limited the options.

Two screw holes on the side of the chassis with a slight convex bump to them, spaced exactly right to line up with the holes on the tuner bracket!

There were no screws present so perhaps they were removed or never supplied by RCA but they are threaded the same as the chassis screws so a couple screws and washers and I was in business.

Sams doesn't mention this but I'd bet it's in the RCA factory service literature?

This set also has the worst case of yoke rot I've seen, the cover on the back of the yoke holding the centering ring (only one) is completely crumbled to dust, even the yoke itself is distorted somewhat. I have a couple Triad replacement yokes but they don't come with the cover, they too are starting to distort some but are much better than the original so I'm going to swap one of them in.

[bandersen]

Nice looking set. According to the Riders index, it's known as "The Ramstead" and covered in volume 19-89.

[Username1]

2 AM and 7 of us can't sleep......

Nice set.... I'm goin back to bed.....

good luck.........

You have that back together by morning....

[Eric H]

Originally Posted by Username1

2 AM and 7 of us can't sleep......



You have that back together by morning....

No problem

Actually I brought it up on the Variac with a test CRT and got a raster!
When i tried it a few months ago I just got an electrolytic getting hot, must have reformed the filter somewhat, it still get's warm at 90 volts but at least it runs.

[Tubejunke]

Originally Posted by Eric H

No problem

Actually I brought it up on the Variac with a test CRT and got a raster!
When i tried it a few months ago I just got an electrolytic getting hot, must have reformed the filter somewhat, it still get's warm at 90 volts but at least it runs.

IF it gets warm, replace it quickly..

Edit: Sorry Eric, I didn't even look at who was posting. I know that you know this. I was thinking it may have been someone newer to electronics.

[Kevin Kuehn]

I like it!

Your chassis looks very similar to my 21-D-7177. It's somewhat challenging to replace the caps on the PC boards. I ended up sneaking in through the back holes in the chassis with the soldering iron. I also had the crumbling yoke cover and had to make a wooden replacement for mine.

[wa2ise]

Originally Posted by Tubejunke

IF it gets warm, replace it quickly..
.

The fact that the TV sorta works indicates to me that it's worthwhile to do a full recap, as the important unobtanium parts are functional (flyback, power transformer, CRT, yoke).

[kvflyer]

Originally Posted by wa2ise

The fact that the TV sorta works indicates to me that it's worthwhile to do a full recap, as the important unobtanium parts are functional (flyback, power transformer, CRT, yoke).

"Truer words were never spoken". That is always a plus.

[walterbeers]

Nice set, but don't even try to reform the capacitors especially the one that that gets hot. I brought a TV up once that an electrolytic popped and blew out a bunch on smoke. Great set to restore though, as the raster means at least the flyback, yoke,and power transformer is good. Hope the CRT has good emission. Good luck with your project!

[hi_volt]

Very nice looking set and great 50's styling. Definitely worth restoring. Love the swivel base.

[DavGoodlin]

Nice set. It will be helpful to see how you un-solder the capacitors. Otherwise RCA's are such a treat to work on.
I have a 1956 and a 1959 with the same obstacle. Those channel windows were so cool and it seems only RCA had them.
What is that funky white cheesy-smelling stuff on the knobs? I get that sometimes and the only cure is to toss em in the dishwasher.

In the era of mahogany or limed oak, is that finish a dark blonde with highlights?

[Eric H]

Originally Posted by DavGoodlin

In the era of mahogany or limed oak, is that finish a dark blonde with highlights?

The dark areas seem to be Walnut Veneer, the front is a Yellow/Blond, probably some type of painted finish but it seems to be real wood underneath.

Cabinet is good, it just needs to be wiped down with a little stain to fill in some small scratches here and there, the yellow is in great shape.

The knobs are okay, they just need polished up, the flash made them look whitish, the cogged belt driving the channel number dial is broken, I'll probably just fix it in place on channel three since it doesn't really have to function any more.

It didn't have a back when I got it but someone over at the Antique Radio Forum sent me one.

[dieseljeep]

Originally Posted by DavGoodlin

Nice set. It will be helpful to see how you un-solder the capacitors. Otherwise RCA's are such a treat to work on.
I have a 1956 and a 1959 with the same obstacle. Those channel windows were so cool and it seems only RCA had them.
What is that funky white cheesy-smelling stuff on the knobs? I get that sometimes and the only cure is to toss em in the dishwasher.

In the era of mahogany or limed oak, is that finish a dark blonde with highlights?

I used to unsolder the entire board when replacing caps on the vertical board. there was just too many of them, that needed replacement.
The .01/600V cap in the horizontal wave form circuit, I used to unsolder, though the access holes. I even replaced it in the home. I carried orange drop caps in the caddy, for that.
I pulled the chassis and set it on top of the tube caddy, so I didn't have to disturb the tuner and that lousy belt, as the leads were long enough.
On the '57 model, the tuner unplugged and you could remove the volume, contrast control, without removing the TMA.

[Tubejunke]

I have found that a sets age and how long it has gone in dormancy dictate the need for full recap jobs. To be specific, my oldest set is a 1947 model, an RCA. I have a 1950 RCA as well and both sets required complete recaps; no way around it. However, many later 50s and almost all 60s sets will do fine with the original electrolytics. Just get rid of everything else non polarized except ceramic discs.

Funny how as much as this topic comes up and we talk about "full" recaps, I venture to say that most of us don't go through the ceramic discs, so really it's not a full restoration. Not saying it is wrong, because they have proven to be ultra reliable and it would be a waste of time and money to swap them out for what these days may just end up being an inferior part. Like the old TVs and radios, they just don't make them with the quality that they used to in many cases.

[Electronic M]

Orange drops also often are still good, but there are exceptions to that.