[ARC5] 10 meter BC-454 - screen voltage

[Kenneth G. Gordon]

Looking at the tube tables, I see that the screen voltage to the 12SK7s is 150 VDC when the 
plate voltage is 250 VDC. When the plate voltage is 100 VDC, the screen voltage should also 
be 100 VDC, according to those tables. 

Both ratings are for when the tube is operated in Class A.

This receiver is still using the original screen-voltage voltage-divider (the two black wire-
wound resistors standing up in the back). Screen voltage is 75 VDC to all the tubes in the 
receiver, except the 12A6. Plate voltage, with the power supply I am presently using, is 275 
VDC.

I wish to reduce the plate voltage to no more than 180 VDC. I plan to use a VR-75 and a VR-
105 in series for this.

What is the consensus concerning screen voltage to the RF and IF amps? 

My plan is to raise it to at least 100 VDC via a resistive voltage divider across the 180 VDC 
regulated input.

In your opinion, what might be the result, both pro and con?

In my opinion, this will result in greater gain (due to the higher relative SG voltage) and lower 
noise (due to the reduced plate voltage) at the RF and IF amps.

Ken W7EKB