[Swan] Re Swan 1200 X

[Bob Letts]

Hi to all Would like to fine tube info on 8950s in my 1200x serial #19456.
Schematic shows grid circuit with pins 3,4,10,11, tied together. Cathode
circuit pins 5,9,2,6 tied together. Actual wireing grid pins11 and 3 to
negitive bias voltage.Pins 4 and 10 are grounded.Cathode pins 2 and 9
connected to drive input. Pins 5 and 6 connected together and left floating.
Was this a later change for better operation? What should the operating
negitive bias voltage be. I measured -15 volts. Thanks for any help.
Bob