rca projection set

[radio nut]

I just got a rca 9 pc 41 projection tv. Will post pics when cell phone is in an area with better signal!
The crt is a General electric so I believe it to be a replacement. It is a 5tp4 that tested SUPER strong! the cabinet is fair but the important screen is nice. I am not sure but I think it may have come from a bar or club. The reason I am saying this is because there is a really long cord with a box that has a couple of controls on it. Maybe early Type remote?

If someone could look up the Sam's for this set I will be grateful!

[hi_volt]

The long cord with the box at the end is a rare remote control for this set. Excellent score. I think the remote control has a channel select and a brightness control. Looking forward to seeing pix, particularly of the remote.

[Kevin Kuehn]

Schematic is in Sams 90-9. It's scanned and available on the ETF website.

http://www.earlytelevision.org/pdf/R...-Sams-90-9.pdf

[radio nut]

Hopefully these pics from my phone load ok.

[radio nut]

Is this set rare and valuable?

[ChuckA]

Originally Posted by radio nut

I just got a rca 9 pc 41 projection tv. Will post pics when cell phone is in an area with better signal!
The crt is a General electric so I believe it to be a replacement. It is a 5tp4 that tested SUPER strong! the cabinet is fair but the important screen is nice. I am not sure but I think it may have come from a bar or club. The reason I am saying this is because there is a really long cord with a box that has a couple of controls on it. Maybe early Type remote?

If someone could look up the Sam's for this set I will be grateful!

The "remote control" is for brightness and contrast. The HV regulation is not very good on these sets, so in 1949 they added the remote so you could adjust when the picture went out of focus due to a bright/high contrast scene.

The 8PCS41 (1948) and 9PC41 are the most common projection sets found, not rare and sorry to say not that valuable.

The most important part of the optical system is the spherical mirror located in the optic barrel.

Chuck

[earlyfilm]

Originally Posted by radio nut

Is this set rare and valuable?

The usual problem with 5TP4's is they quickly turn brown. I knew GE made some CRT's but I've never seen one.

The remote control changes only brightness and contrast! This odd combination is so you can lessen picture blooming without getting off your chair. This was due to uneven signals in the early days and the poor HV regulation in the set's HV tippler.

Did you ever wonder why RCA made both 1B3's and 1B3/1G3's during the 1950's? The reason is the RCA projection sets. The 1G3 worked with higher voltage, and so it had a higher internal resistance, but it could not handle as high current as the 1B3. Only use either a 8016 or a 1B3 to lessen the HV regulation issues in these sets.

Just a little warning: The schematic and illustrations in Sam's are from the 1947 model and yours is the 1949 model. The biggest change is your set uses a completely different light barrel and it was pre-wired for the remote.

As to the value restored: Less than it will cost to restore.

As to the usual cost of a 1949 model in the condition as seen in your pictures, $20 to $250 as they are hard to sell due to their size, but they look great when working. Shipping these 247 pound monsters, plus packing, costs a fortune.

These sets came in Walnut, Mahogany and Toasted Mahogany (a dirty blond).

Use keyword searches (9PC41, 8PCS41, 648PTK, 648PV and 741PCS) in this Forum and you will find several notes on restoration of these sets.

You also can use the same searches on this site:

http://antiqueradios.com/forums/viewforum.php?f=3

You may be used to working on most sets without shields on HV and CRT, but this set runs between 25,000 and 27,000 volts, and I'd not advising being close to the parts without the X-Ray shielding in place.

When removing the parts from the cabinet, remove the HV chassis first and follow the HV lead down and unsolder it. Take care not to bend it sharply.
If your HV cable is shot, you can take a modern HV cable and working the cable shield like a finger-snake, insert the new HV lead in the old shield.

The mirrors are silver surface. Do not touch them. I would not recommend attempting to polish them, unless they are tarnished beyond all hope, because you probably will go through the coating. You will find in the above mentioned articles, information on how to get them resurfaced if needed.


This thread reminds me: Eric H., how is you 8PCS41 progressing? You were flying along and then stopped posting about it 4 months ago.

James

[radio nut]

What do you mean by the crt turning brown?

[peter scott]

High beam current on a tiny screen causes phosphor burn.

Peter

[Eric H]

Originally Posted by earlyfilm

This thread reminds me: Eric H., how is you 8PCS41 progressing? You were flying along and then stopped posting about it 4 months ago.
James

Stalled on the cabinet, also flooring project interfered, hopefully back on it soon.