New 9-PC-41 owner

[cwmoser]

Originally Posted by reeferman

I have removed all the chassis and tested all tubes.
11 tubes test bad on my 707 tester (ouch).
Phil

When I restored my Philco projection TV, I found a lot of tubes
bad too. My Philco 48-2500 has 29 tubes including the CRT.
How many tubes are in your RCA?

There must have been 75 paper and electrolytic capacitors in
my Philco 48-2500. Have you counted how many in yours?

BTW, how are the mirror surfaces?

Carl

[reeferman]

Carl

I counted 37 tubes less CRT, Sams says it has 41. Haven't even looked at caps yet. Oops, a recount reveals three 1B3s and with the CRT that's 41

The mirror surface is covered with a layer of dust but seems to be in excellent condition. What do I clean that with? I would hate to damage it with the wrong cleaner/procedure.

Thanks for the cleaning tips, but I'll stay away from the water.
Phil

[hi_volt]

I just carefully cleaned my chassis with formula 409 sprayed onto a clean cloth used to wipe it down. A bit of work, but no risk of getting water into places you don't want it. By far the dirtiest part of my set was inside the high voltage chassis. The ionized air in that part of the set when it is running is a dust/dirt magnet.

[cbenham]

Originally Posted by reeferman

The mirror surface is covered with a layer of dust but seems to be in excellent condition. What do I clean that with? I would hate to damage it with the wrong cleaner/procedure.

In this order,
Use a vacuum cleaner to remove all the dust from inside the cabinet and in the optical barrel and the projection light path. Dust will make the picture look dim and reduce the fine detail as well.

Clean all the dust you can from the concave mirror, the face of the CRT, the corrector plate, the reflecting mirror and the rear surface of the projection screen with a very light brush, camel hair type if possible.

If the mirror surfaces [these are FRONT SURFACE mirrors, so be very careful] have a coating of dust or grime that can't be brushed away, use a good liquid photographic optical lens cleaner and optical cleaning tissue to very lightly clean the surfaces. The corrector plate is most times clear molded plastic and will scratch easily. Clean with the liquid cleaner and optical tissue as with the mirrors.

These sets make a bright picture when everything is clean and spiffy inside.
Good luck with this project!

[reeferman]

I'll try it as soon as I can and let you know the results. BTW, would you have any literature on the optical barrel set up? The Sams info is next to worthless.
Thank you
Phil

[reeferman]

Bad news. The CRT shows a H-K and a G1 short. The G1 short is my real concern. I have tried removing it with a B&K 466 and a Sencore CR168 Big Mack to no avail. About the only thing left to try is using the old (live wire) 2nd anode around the pins. Problem is I don't have anything that old anymore.

Replacing the 5TP4, the bad tubes and recapping just doesn't make sense. If the 2nd anode trick works on the CRT I'll reconsider. My next post might just be an obit for the set.

Phil

[hi_volt]

Don't despair.....occasionally a 5TP4 shows up. About 2 months after purchasing my set I scored a NOS 5TP4 on the bay.

[Phil Nelson]

Some years ago, I spied a funny tube in a box at a neighbor's garage sale. They had no idea what it was for, nor did I, since I knew nothing of old TVs at the time. They gave it to me. Eventually, I happened to mention this tube to a fellow collector, who said that he could use a 5TP4 and traded a complete television for it.

You never know what's floatin' around out there . . .

Phil Nelson