[ARC5] Transmiitters: Parameters?

[Kenneth G. Gordon]

For those of you who are actively using your ARC-5 transmitters on the air, I 
am very curious about what operating parameters you are coming up with: 
plate voltage and current, grid voltage and current, screen voltage (and 
maybe current), power input, power output, etc.

I am especially interested in what you are seeing for grid voltage and current.

I'd also like to know what value of screen-voltage dropping resistor you are 
using (if any), what source of voltage for the screens you are using, and what 
the measured screen voltage turns out to be.

I would love to get one of my junkers in operation here, mainly just to see 
what it is going to sound like on the air.

FYI, according to the RCA Transmitting Tube manual, in Class C as an 
amplifier, with 600 VDC on the plate, the grid voltage SHOULD be -45 at 4.0 
mA. This is with an 11.2 kOhm grid resistor, but the grid-resistor in the 
ARC-5 transmitters is 15K, which at 4 mA would give a grid voltage of -60, 
which would then require more drive.

I am thinking that the grid-current is low in the ARC-5, possibly well below 4 
mA, since the driver is the 1626 and the grid resistor is high. This would 
make for a pretty inefficient amp and in addition, could contribute to chirp.

Ken W7EKB