An Emerson with a 19AP4??

[jr_tech]

Where did it go to? is it C-63?

jr

Edit add: Is the 30K resistor *marked* as 30k or could it actually be the 470ohm resistor that has changed value?

[dieseljeep]

Originally Posted by jr_tech

Where did it go to? is it C-63?

jr

Edit add: Is the 30K resistor *marked* as 30k or could it actually be the 470ohm resistor that has changed value?

I think it's a wire wound resistor. That's one crazy value change!
Neither schematic shows the wattage. Emerson seemed to use that type of high wattage resistors and on most, the leads corroded like that.
One the Sams, they show a -165 volt bias line.
BTW, what volume Riders is the Emerson sourced schematic in? Maybe, there's a production change bulletin, showing the circuit changes.

[Kamakiri]

Originally Posted by jr_tech

Edit add: Is the 30K resistor *marked* as 30k or could it actually be the 470ohm resistor that has changed value?

No, it's actually marked 30K.....I didn't test it.

Whoever was working on this set last must have either had no idea what he was doing, got frustrated and quit, or discovered something bad and said "the hell with it". I'm hoping it's not the latter. I found and traced all of the disconnected caps, which coincidentally were all in one row between the 2nd sync amp and the vertical output.

[jr_tech]

Originally Posted by Kamakiri

No, it's actually marked 30K.....I didn't test it.

Not shown in the schematic that I have for what appears to be the same (or similar) set (PF set 126-folder 5) nor as an indicated substitution/modification... where does the other end connect?

jr

[dieseljeep]

Originally Posted by jr_tech

Not shown in the schematic that I have for what appears to be the same (or similar) set (PF set 126-folder 5) nor as an indicated substitution/modification... where does the other end connect?

jr

I was just looking at the schematic again. In the picture, the vertical linearity pot is a rather high wattage type. The 470 ohm resistor seems to make sense, even if the pot is turned to minimum resistance, there is still bias on the cathode. I also notice the 6K6 is triode connected. I would restore the circuit to original, per the schematic.
I find it strange, that some of the vertical circuitry is so far away from the sweep tubes. Rather complicated set to work on, plus the wiring is like a rat's nest.

[Kamakiri]

Originally Posted by dieseljeep

I was just looking at the schematic again. In the picture, the vertical linearity pot is a rather high wattage type. The 470 ohm resistor seems to make sense, even if the pot is turned to minimum resistance, there is still bias on the cathode. I also notice the 6K6 is triode connected. I would restore the circuit to original, per the schematic.
I find it strange, that some of the vertical circuitry is so far away from the sweep tubes. Rather complicated set to work on, plus the wiring is like a rat's nest.

For the moment, I'm going to assume that the last guy who had this set knew something about the components that I don't, and replaced some stuff or something that required the caps and resistors that don't show up in the schematic. I mean, you usually don't throw what looks like expensive high-wattage resistors into a set without a good reason, right?

You're right though, the wiring is kind of like a rat's nest, but I've dealt with a lot worse. My plan at the moment is just to finish up recapping, and see where we're at. After I got everything hooked up that wasn't, and got a lot of the caps in, I pulled the 5U4 and bench tested the chassis to see if the transformer was good. Ran nice and cool and all the tubes lit, so that's a good sign.

[Kamakiri]

Originally Posted by jr_tech

Not shown in the schematic that I have for what appears to be the same (or similar) set (PF set 126-folder 5) nor as an indicated substitution/modification... where does the other end connect?

jr

It goes to the yoke socket for the picture tube. This is Sams 126-5, same as yours.

I have to say that the quality of this set compared to others I've worked on of this era isn't anything to write home about. Cheap parts, crappy sloppy wiring.

[jr_tech]

Originally Posted by Kamakiri

It goes to the yoke socket for the picture tube. This is Sams 126-5, same as yours.

What pin #? ... Perhaps we can reverse engineer the resistor connections and figure out what they were trying to accomplish.

jr