Impedance Matching Transformer

[Steve - WB3HUZ]

Likewise, you need to reference the grid of each 811A to ground. This can be done by placing a 10k ohm resistor from each grid to ground. In your schematic, the grids appear to be just floating.

Wouldn't the grids be referenced to ground through the center-tap of the transformer?

[WA1GFZ]

The easy way to drive a tube modulator with a SS audio stage is a 8 ohm output transformer backwards so you step up the voltage swing. 10 volts won't cut it.