Morrism -- You know the old saying -- the only bad question is the one that wasn't asked!
In each channel, pin 3 between the two output tubes is connected by a jumper, therefore, two jumpers. Then, from each channel's jumped cathode terminals (pin 3), there would be a 10 ohm resistor connecting jumpered pair to the output of the EFB regulator. Therefore, at the output of the regulator, that connection includes:
1. One 10 ohm resistor to one channel's jumped cathode terminals,
2. One 10 ohm resistor to the other channel's jumped cathode terminals,
3. The 20 uF bypass capacitor, and
4. The two 220 ohm resistors from the heater winding.
Therefore the four cathode terminals are not all connected together, but connected together in two pairs, two for each channel.
Kevin -- I was really trying to stay within the boundaries of the topology that the original design represented. There are soooo many 6BQ5 designs out there that use the AF Amplifier/Cathodyne formula, that I thought it would be nice to stay a little truer to the original format. But in doing that, the original paraphase inverter needed so much help, that the logical move was just to modify it to the floating paraphase type. It represents a significant improvement over the original design.
Thanks for following along!
Dave