Show us the circuit. The valve grid needs to get a DC bias from somewhere. This could be the 100k to ground, or directly from the DAC output if this provides a suitable voltage.
The valve is cathode bias.
The DAC and the tube gainstage are in separate chassis.
The 50 ohm I/V resistor is in the DAC chassis.
The 100k ohm grid resistor is in the gainstage chassis.
The DAC and the tube gainstage are in separate chassis.
The 50 ohm I/V resistor is in the DAC chassis.
The 100k ohm grid resistor is in the gainstage chassis.
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