Still working on my Sylvania

[jeyurkon]

Originally Posted by Mick AV-8

Hi all seemed to have lost this website as it was down for a while.
I needed to ask the staff a few new questions..hope you can chime in.
Sylvania Model is 23M-1 , 23-TUBE B&W Sylvania "Halo-Lite". Chassis # 87111-084-075 and refers to SAMS PHOTOFACT PCB174-1 & 154-12
My past posts also seem to be lost.

Question:
Few different tubes in the chassis wondered if the were totally wrong?
Have 6AX4GTB..should be 6W4GT
Have 6CB6A..should be 6BC5 (in 4th video IF amp)
Have a horizontal tube from Westinghouse all I can make out is DN6
should be a 6CD6G
Can I leave this in or are they wrong?
* I see from the SAM that a cap .0005/10K volt is in the HV compartment..should I really go in this compartment or leave it alone and just do caps and electrolylics under the chassis?
* The black toilet roll paper tubes on the top (C1,C2,C3) can I leave them be?
*Halolight control has two resistors 700 and a 500 Ohms,10watts..should they be replaced?

thanks

The 6AX4GTB is fine. It has higher PIV and peak current ratings than the 6W4.

In production change C11 they switched to the 6CB6. I believe either should work, but check the production code on your chassis. Do you still have the schematics I sent you?

The 6DN6 was obsoleted before the 6CD6. They must have had one laying around. I'd check the all tubes to make sure they're o.k. But the substitutions seem correct.

There are two 0.0005 uF 10,000 volt caps in the HV section. Replace them both. They're bumble bees and are probably bad by now, unless they've already been replaced. There should be two other bumble bees elsewhere in the set that need replacing, unless someone did that already.

The schematic location numbers in SAMS is different than in the Factory service manuals, so I can't be sure which caps you mean. But, I'm pretty sure. Unless you have the equipment to properly reform and test them at rated voltage, you should replace them. I kept mine. Sane people don't. They don't live forever. They also will die and take out other components if you power the set up normaly without reforming them first.

I have service hints and rationale for the production changes that I didn't include when I scanned the manual for you because they are scattered over many pages with other sets. If you have a specific question I can try to look it up for you.

John