1967 Philco 23" color horiz problem

[Chad Hauris]

I got a Philco 23" set from the Helping Hands thrift store today. They wanted $20! for it but I said $5-10 is what I usually pay so they sold it for $5. There was no cheater cord and it was missing the damper and 6AQ5 tubes.

The first problem was that the power switch was bad, no power on testing. I bypassed the switch and was able to get the power on.

The problem I am having is some kind of overload on the HO tube. The normal screen voltage on the 6KD6 is 145 volts according to schematic.

With the plate and cathode of the 6KD6 connected I get only 59 volts on the screen. I tried supplying the screen with an external power supply and had to shut it off as the current draw at the screen was more than 150 ma.

The grid voltage is -40 volts.

With the plate disconnected but cathode still connected the screen voltage is also 59 volts.

The voltage at the screen pin with the 6KD6 out of the socket is 265 volts.

Whats weird is that the overload seems to be occuring even when the plate is not connected. Also I get weak sound with the plate disconnected and no sound with it connected.

I also tried a new 6KD6 but same results. All the voltages in the B+ power supply look normal.