Mighty Monarch of The Air

[old_coot88]

Originally Posted by vts1134

New transformer same problem . I will return to the schematic for component by component tracing soon.

Well tarnation. Just out of curiosity, what voltage are you getting at the low/wiper end of the vert. size control? oc

[jeyurkon]

**I forgot about the recent progress and was commenting about an earlier state.**

[old_coot88]

Um.. just to reiterate what was suggested back in post# 62, the plate load resistor of the
V.oscillator is a very common failure point and should be double checked if you haven't already done so. Now that we got the schematic to look at, that would be R66, 470K (half a megohm +/- 10% or so).

And does the V.size control (R4) measure correctly at 2.5 meg or so?

How about the voltage at the bottom of R4? Since it's supplied from B boost, it should probably be somewhere around 400-450 V.

oc

[vts1134]

I think I might have found my answer... Well let's all cross our fingers and hope so . Being a rookie at this restoration business I mistook black beauty capacitors for resistors. I missed five of them in the set including C49- the vertical discharge cap. I have the replacements on order and I'll let you know if that's the solution.

R66 is good to go btw.

[jeyurkon]

Sounds promising. They look pretty but are evil.

[vts1134]

But they're so pretty!

[old_coot88]

Originally Posted by vts1134

I think I might have found my answer... Well let's all cross our fingers and hope so . Being a rookie at this restoration business I mistook black beauty capacitors for resistors. I missed five of them in the set including C49- the vertical discharge cap. I have the replacements on order and I'll let you know if that's the solution.

R66 is good to go btw.

Yeah, C49 could sure as heck be pulling down the 6C4's plate voltage if it's leaky. Just for the heck of it, try disconnecting C49 and see if the plate voltage goes up. That resistor in series with it (R67), what does it measure? It's kinda hard to read from the print but it looks like it says 8K.

With C49 disconnected, what happens to the sweep?

oc

[vts1134]

Originally Posted by old_coot88

Yeah, C49 could sure as heck be pulling down the 6C4's plate voltage if it's leaky. Just for the heck of it, try disconnecting C49 and see if the plate voltage goes up. That resistor in series with it (R67), what does it measure? It's kinda hard to read from the print but it looks like it says 8K.

With C49 disconnected, what happens to the sweep?

oc

I know R67 reads good, I checked that off of my list. I'll disconnect C49 and and report results but I can't do it tonight. I've already started and I made a rule, no TV time after beer .