17" RCA with doors

[sansui2000A]

I bought a old B&W set today. It has wood doors that hide the picture tube and knobs kinda cool. I'll post a pic when I get it home.

I just wondered how old it might be and what sams would apply to it.

I found these numbers on the chassis:

274-113 5

RVC-L9

The picture tube is a 17CP4 was that a common tube?

Any help would be appreciated.

Thanks

[Eric H]

Look for a KCS number on the chassis or a model number on the back cover.

From the CRT type I would guess early 1950's 51-52 perhaps.

[sansui2000A]

The cover was missing, but the guy found it today.

Model is a 7-T-123

[sansui2000A]

Some pictures....

[bgadow]

Sams 134-9. Note that there is a 7-T-123B that is covered in 156-11.

I have extra copies of these. If you want one send me a PM with your address. I try to get $5 for them.

[jpdylon]

Definitely a good restoration candidate.

I have a spare good 17CP4 if you need it.

[sansui2000A]

Thanks guys, I'll pull the chassis today and see what else it might need. Where is the best place to buy electrolytic capacitors?

[jpdylon]

If you need a simple solution for capacitors without having to rummage through catalogs justradios.com is an excellent place for capacitors. Tubesandmore.com (antique electronics suply) is also a good place.

[sansui2000A]

I made some progress today. Took the chassis out and cleaned it checked that the electrolytic weren't shorted. I took a chance and plugged it in and got about 2-3 inches of vertical deflection. It looked like the raster was only deflected from the center up..not balanced around the center of the screen.....
any ideas???

Thanks

[Tube TV]

The wax/paper caps are leaking .
It will improve , or work perfect once they are changed .
If you need scans of the schematics let me know and I'll email them to you .
I think my data covers that set ?

[sansui2000A]

I got the schematic today and ordered some capacitors from justradios.com for the vertical section.

[Phil Nelson]

I would replace the rest of the paper capacitors while you're at it.

Phil Nelson

[sansui2000A]

I have almost full vertical deflection after changing some caps, but the set has a slight arcing sound which causes the raster to jump around. changing the width control makes the noise increase and decrease. Also, the width control really affects the brightness. Any suggestions for cleaning the high voltage areas?

Thanks

[jpdylon]

Your arcing may be caused by a defective doorknob capacitor in the high voltage cage.

Also check the high voltage lead going to the rim of the picture tube for cracks in the insulation.

The width control effects the brightness and arcing because its adjusting the screen voltage to the horizontal amplifier tube. Lower the voltage on the screen and you get a slightly dimmer, thinner picture with less high voltage.

I STRONGLY recommend you replace all of the paper and electrolytic capacitors. You need to be sure the electronics are up to snuff before you do any serious troubleshooting of the HV and sweep sections.

[sansui2000A]

I ordered about $50 worth of caps today...should be a good start.