The one thing I didn't think needed any work with this money pit RCA 29K was the speaker. A Lighting strike fried everything made of litz wire and both the tone switch wafer and P.B. selector switch were snapped in half from another owner, also the power transformer gurgeled like melting tar after 3 hours of play. All fixed. Now this.
At the output tube pin 3 and supply pin 4 the voltages immediately shot from 270 volts to 450volts when I tested the voltages after i noticed the stations weren't coming in. The proper voltage should be 240volts. I also noticed the bake lite connection to the speaker getting very hot. 430 volts.
I unplugged the speaker and tested the voltage again on the power and supply connections of the first output tube 6K6 and noticed a voltage drop to negative levels. the pin that seems to be the trouble maker ties to the power pin on the first output tube that leads to the voice coil on the speaker.
The question I would like an answer to is: How do I replace/repair the voice coil, or could it be the speaker output transformer causing the problem?

It's possible that one side of the output transformer, which is mounted on the speaker, has shorted out. The voice coil of the speaker wouldn't reflect enough power into the primary even if shorted to cause this problem.

I suggest that you start by unplugging the speaker and using an ohmmeter to measure the resistance from both sides of the output transformer to the center tap. This can be done at the speaker plug. The two "sides" must be approximately equal in resistance and at least a few hundred ohms each (end to CT). You can also check the field coil winding in this way- if it has shorted out it will put higher voltage on the CT of the output transformer CT. I don't know what the DC resistance of the field coil should be for this set but they are usually quite high -several hundred ohms or so.

With the set turned on (speaker plugged in) you should have a fairly large DC voltage drop across the field winding (measured with respect to chassis ground) AND across each plate side of the output transformer measured with respect to the CT. If any of the voltages are close you probably have a short.

My recent experience has been that these speaker/transformer sets for RCA consoles are fairly easy to find on eBay in good shape.

Unplugging the speaker plug will disconnect the B+ to the radio circuits. The speaker field coil is the filter choke for the power supply. I suggest checking the B+ load side of the speaker field choke in the chassis to ground with an Ohmmeter with the power off and the speaker unplugged. The B+ circuit should read a few thousand Ohms. If the reading is low, there is most likely a problem in one of the branches of the B+.

Clifton

:It's possible that one side of the output transformer, which is mounted on the speaker, has shorted out. The voice coil of the speaker wouldn't reflect enough power into the primary even if shorted to cause this problem.
:
:I suggest that you start by unplugging the speaker and using an ohmmeter to measure the resistance from both sides of the output transformer to the center tap. This can be done at the speaker plug. The two "sides" must be approximately equal in resistance and at least a few hundred ohms each (end to CT). You can also check the field coil winding in this way- if it has shorted out it will put higher voltage on the CT of the output transformer CT. I don't know what the DC resistance of the field coil should be for this set but they are usually quite high -several hundred ohms or so.
:
:With the set turned on (speaker plugged in) you should have a fairly large DC voltage drop across the field winding (measured with respect to chassis ground) AND across each plate side of the output transformer measured with respect to the CT. If any of the voltages are close you probably have a short.
:
:My recent experience has been that these speaker/transformer sets for RCA consoles are fairly easy to find on eBay in good shape.