Mighty Monarch of The Air

[old_coot88]

To the OP:

At this point, and if you still have access to the variac, you might consider trying this:

Disconnect both primary leads of the vert.out transformer and drive it directly with the variac. Granted it's a sine wave instead of sawtooth, but will tell you a lot. You should get very robust deflection, probably at around half to full line voltage. This will tell you the tranny and yoke coils are good, thereby proving the fault lies somewhere "upstream" of the tranny.

If the problem remains, it's gotta be either in the tranny or the yoke (like a shorted turn that won't show up on a resistance check). Now disconnect the yoke winding and drive it directly with the variac (starting from a low setting). If deflection comes up, the yoke is good and by process of elimination, the fault would be in the tranny.

Of course if the fault is "upstream" all bets are off. The first place i would look is the plate load resistor of the vert.oscillator, if you haven't already checked it. I can't see it since i don't have the schematic of your set, so this may not be applicable. But in many sets that resistor is a very common failure and worth bookmarking*. Its value goes 'waaay high due to being hammered by a high level pulse. Bill(oc)

*Germaine to all makes and ages of '50s-'60s tube sets.

[vts1134]

Originally Posted by old_coot88

To the OP:

At this point, and if you still have access to the variac, you might consider trying this:

Disconnect both primary leads of the vert.out transformer and drive it directly with the variac. Granted it's a sine wave instead of sawtooth, but will tell you a lot. You should get very robust deflection, probably at around half to full line voltage. This will tell you the tranny and yoke coils are good, thereby proving the fault lies somewhere "upstream" of the tranny.

If the problem remains, it's gotta be either in the tranny or the yoke (like a shorted turn that won't show up on a resistance check). Now disconnect the yoke winding and drive it directly with the variac (starting from a low setting). If deflection comes up, the yoke is good and by process of elimination, the fault would be in the tranny.

Of course if the fault is "upstream" all bets are off. The first place i would look is the plate load resistor of the vert.oscillator, if you haven't already checked it. I can't see it since i don't have the schematic of your set, so this may not be applicable. But in many sets that resistor is a very common failure and worth bookmarking. Its value goes 'waaay high due to being hammered by a high level pulse. Bill(oc)

Awesome suggestion! Thank you so much, I'll try this as soon as I get in front of the set again.

BTW- What is The OP?

[vts1134]

I think I need to back up and run a test that I don't think I did right before. I want to test the deflection coils to see if my problem is there. In the picture of the schematic below I tested continuity across the yellow wires. I'm not sure if that was right. I think I need to test across the red, and across the blue to test each coil. Can any one confirm that? If that is indeed what I need to do then my next problem is that I don't know how to test the two coils independently of each other. I apologize for leaning so hard on all of you to help me get this sucker up and running, but we all have to start learning some where I guess.

[VintagePC]

Looking at your picture, what you'd want to do is as follows. This will ensure you've tested the coils:

1. Disconnect/desolder the ground connection at the lower yellow arrow. (this ensures you test the coils themselves and not an alternate current path - note the other yellow arrow traces through the transformer and also to ground, resulting in two possible paths for the current to flow when you measure any two points in that line.)

2. Measure across the blue arrows.

3. Measure across the red arrows.

4. Reconnect the ground connection from step 1.

It looks like you have resistors in parallel with your coils in the schematic. If that's the case, the resistance you measure should be 1/measurement = 1/(coil resistance)+1/(resistor resistance). Keep in mind the coil will have a fairly low resistance, so the reading is probably only a handful of ohms.

With both resistor values the same, the red and blue measurements should be identical.

If you measure anything different than expected, you'd need to disconnect one lead of the resistor to determine the culprit (coil or resistor)

[vts1134]

Originally Posted by VintagePC

Looking at your picture, what you'd want to do is as follows. This will ensure you've tested the coils:

1. Disconnect/desolder the ground connection at the lower yellow arrow. (this ensures you test the coils themselves and not an alternate current path - note the other yellow arrow traces through the transformer and also to ground, resulting in two possible paths for the current to flow when you measure any two points in that line.)

2. Measure across the blue arrows.

3. Measure across the red arrows.

4. Reconnect the ground connection from step 1.

It looks like you have resistors in parallel with your coils in the schematic. If that's the case, the resistance you measure should be 1/measurement = 1/(coil resistance)+1/(resistor resistance). Keep in mind the coil will have a fairly low resistance, so the reading is probably only a handful of ohms.

With both resistor values the same, the red and blue measurements should be identical.

If you measure anything different than expected, you'd need to disconnect one lead of the resistor to determine the culprit (coil or resistor)

I'm good on the points you mentioned above. My problem is that I don't know where on the actual set itself is in between the two coils. It makes sense on the schematic but I can't transfer that to the set.

[VintagePC]

Hmm... it might well be an inaccessible direct connection between the coils in the yoke itself. If that's the case, the best you can do for steps 2/3 is test across the yellow arrows. the result can indicate if coils are open. It won't indicate shorts because of the parallel nature of the circuit.

The AC/variac drive test mentioned above will give better information as to the state of the coils, since you get a visible result... If it does indicate a problem in the coils, the test I described would help narrow it down.

[old_coot88]

Originally Posted by VintagePC

Hmm... it might well be an inaccessible direct connection between the coils in the yoke itself.

The connection is most always inside the yoke housing.

If that's the case, the best you can do for steps 2/3 is test across the yellow arrows. the result can indicate if coils are open.

Yep, but he's gotta disconnect one end, either the ground end as you suggested, or the top end. Doesn't matter which. While it's disconnected is a good time to also check continuity of the secondary winding of the transformer.
To the OP (original poster): is the capacitor across that winding (shown with dotted lines) actually in the set? If so, have you replaced it and/or verified that it's not shorted?
oc