An Emerson with a 19AP4??

[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.