slyvania roundie

[DaveWM]

progress the focus is better than it looks, camera issues.

[DaveWM]

HV setup

1st pic is the HV prob, then the HOT current (used a socket adapter with the cathode break in it, bypassed with a .47uf cap, 500ma range on the simpson 260) and the shunt tube voltage drop across the 1k resistor in the cathode circuit (test point KK and a pin on the 6bk4 which is exposed on the back of the fly cage). lousy pic of the HV prob I know, I tried several times..

[DaveWM]

I used a new focus coil (long story) which worked well (focus range right in the center).

other issues were pretty normal minor stuff.

Broke the pull on push off switch removing the knob, was able to find a new switch on the back of another pot, which is good since the old one looked pretty well toasted.

contrast cap was weak, the chroma board had the normal weak coupling caps between the demodulators and the color amp tubes.

replaced the white tube 2kv caps just to be safe. the one on the Vert primary was leaking the one on the audio primary was not (at 450v anyway).

all the PS caps seem ok, they get a little warm but so far so good, I have the full compliment for replacement if need be. I can make up some replacements on scape twist lock mounts so it would be a quick replacement.

CRT test fine. socket is loose so will deal with that when I get to removing the lens.

dynamic convergence needs to be touched up, had yellow screen in the B&W reception, think the blue was just converging well. I have a NOS diode pack that I may try out if the old diode pack test bad. I did not check any of the converge parts, will if converging does not go well.

Most of the tubes were ok, some shorts IIRC. HOT was fine, as was the vert multivibrator. 6AQ5 was weak, replace all shorted and weak tubes with NOS.

replaced a few out of tolerance resistors, the 2.2meg that come of the boost to the vert, and the 1K in the shunt tube come to mind, there were a few others but no show stoppers.

oh there was an open power resistor in the peaking circuit, that was new to me.

Color would not sync, adj the color osc coil about 1/4 turn (after trying a few different 6GH8's)

Able to get all 3 colors in setup mode on the lowest bias setting.

it did not look like it had been serviced before beyond a couple tubes.

HV was set to 23kv current is about 170-180ma shunt is anywhere from 100mv to 1.5v depending on brighness setting and picture content. for normal view its tend to hover between .5 and 1.2, very stable HV.