1979 GTE Sylvania GT Matic CX9164W chassis E24-3

[pac.attack76]

Ok I set at 200 and I show with leads not touching, then leads touching, and then leads on output and chassis.

[Alex KL-1]

Very low, for sure a damage on HO transistor (more probably) or something very close (damper diode, capacitor, PSU)

[JohnCT]

Originally Posted by pac.attack76

Ok I set at 200 and I show with leads not touching, then leads touching, and then leads on output and chassis.

Something is shorted, although 11 ohms is an odd reading (most horiz outputs short to ground at an ohm or under), but the transistor remains the most likely cause, particularly with a punctured splitter spitting high voltage around.

Remove the transistor's 1/4" screws and remove the transistor by wiggling and pulling upward. Careful if you have to pry because there's a thin mica insulator between the transistor and the frame that can be damaged.

With the transistor out, check the resistance from the metal case of the transistor body to either of the two leads. If you're getting that 11 ohm or under reading, the transistor is bad. If the transistor reads the same as open leads, the problem is elsewhere.

In any case, an 11 ohm reading from the collector case of that transistor to the ground frame means the breaker will trip immediately.

John

EDIT: your DMM doesn't use the Fluke style "OL" to indicate an infinitely high (open) value but uses a "1" two places away from the decimal to indicate an "open" condition. Same thing, different display method.

[pac.attack76]

Ah, ok, I'll check and update.

[pac.attack76]

I'm not getting anything with it out. Just the #1 at far left.

[zeno]

Your meter has a diode / transistor test, the diode symbol.
Look up that function in the manual, too long to type out.
OR look for some tubes teaching it. You will be using it !

Zeno

[JohnCT]

Originally Posted by pac.attack76

I'm not getting anything with it out. Just the #1 at far left.

If the transistor is reading open with it out of circuit, then something else is wrong. If this has a separate damper diode, the diode would be the next suspect because of the punctured tripler. Note that some transistors had the damper diode built in. Yours being an earlier SS design probably has a separate damper behind the horiz output socket (most) or on the main board close to the horiz output.

Is there a schematic on-line? (I scrapped all my paper schematics and most of my SAMS about 15 years ago)

John

[pac.attack76]

I'll see what I can find.

[pac.attack76]

I can't find a schematic and I have no idea where the damper is on this 😞