[dobulee]

Hey Bill,

A lot of these questions were answered a few posts ago, but here goes:

When I made the comment about no HV, the chassis was installed in the cabinet, and the yoke attached. No issue there.

I know that horizonal line freq is 15,750, unfortunately I have no really accurate way of measuring. All I have is an out of calibration 20Mhz Analog scope. So saying '15kHz ballpark' is about as accurate as I can get without the timebase being re-calibrated.

Thanks for the tip about the mica's, they're on my 'watch list' when I get there.

A few posts ago, I noted this was the 6SN7 vertical oscillator - sync separator. John was kind enough to give me the proper schematic, as my Sams shows the 6J5.

This set has a 2 lug terminal strip in the location you indicate -- I think it shows in 'recapped' pictures.

The 100 Ohm in the cathode section WAS bad. It is now a 2W Metal Oxide resistor. Its the blue one up there in that tightly crammed corner of the chassis.


For what its worth, I'm trying to hunt down the sagging 120V BUS problem -- my original comment of a resistor being high was based on an incorrect glance at the schematic.
My set does not have the multiple parallel resistors between the busses in the power supply, but instead has single wirewound power resistors in each of these locations. Not sure if this is original, or a replacement. I went through the academic exercise of calculating the 'expected' equivalent resistances from point to point in the power supply based on the parallel resistances in that section, as well as the 'tie' between 120 and 370 that feeds the RF Amplifier. Below is what I got...nothing seems off by more than ~ 20%:

370 to 250: Calculate 3.65k, measure 3.77k
370 to 120: Calculate 11k, measure 10.6k
250 to 120: Calculate 10.9k, measure 10.2k
120 to Com: Calculate 4.28k, measure 3.8k -- this is off about 12% and could pull both 120 and 250 low, but doesn't account for the full difference.

Can anybody confirm these measurements on another chassis?
Alex