Best way to attenuate input to a grid driven tetrode.

[Naysayer]

My FT891 only goes down to 5 watts and shuts off if I lower the VDC below 12v.
A series resistor sounds like trouble. How far can I reduce the 750 ohms 'swamping' resistance to ground without altering the input impedance a'la Pride formula? It would make tuning & trouble-shooting easier if I could limit output to a few hundred watts.

 

[sp5it]

T-pad att

T-Pad Attenuator Calculator - Engineering Calculators & Tools

This calculator helps you determine the values of the resistors R1 and R2 to be used for a T-pad attenuator.

www.allaboutcircuits.com

 

[nomadradio]

Our standard T-pad to cut the drive into a Pride DX300 3db is a 22 ohm 5W for R1/R2, and a 100 ohm 5W for R3, all carbon-film types. No, it's not exact, but uses standard resistance values.

73

 

[Naysayer]

OK I have some reading to do.
I briefly saw that t match can also aid impedance matching.

Is it feasible to use the pride’s swamping resistance of 750R as one of the T-pad’s resistance values? It’s already there