Screen resistor value on Hiwatt DR103 build

[Hifi_tech]

Hi all,
Since there are more time at home these days I wanted to build an amplifier for my son.
So i have read a lot about the Hiwatt versions out there and come to build this version here: https://hiwatt.org/Schematics/DR_PreLinkedInput_v2.gif

But when I look at the output section on different pictures and builds on the web I often see that people are using 1K screen resistors instead of the 100 Ohm that is original.
The output section is here: https://hiwatt.org/Schematics/DR_100wOutput.gif

What I wonder about then is why are they doing it? Is there any pros and cons out there?

I see that Mark Huss did it on a build he did of the 50W version, but I cant see a shared 470 Ohm 10 Watt resistor in the power supply section on HT2 on the 50 Watt schematics.
The power supply for the 100 Watt version is here: https://hiwatt.org/Schematics/DR_100wPS.gif
And the 50 Watt here: https://hiwatt.org/Schematics/DR_50wPS.gif

If it is better to have a 1K screen resistor on each tube than the shared 470 Ohm followed by the 100 Ohm on each tube, why is it not changed on the different versions of an amplifier made over decades.
Also I see many pictures of the 100 Watt versions where the 1K screen resistors are replaced by owner later, but they still have the shared 470 Ohm resistor in front.
The total screen resistor value would then be way to high, about 470 x 4 + 1K with a total value of close to 2,9 K. or am I completly wrong here?

Would be gratefull for your thoughts about it...

[WinnetouKoslowski]

I have been wondering about this, too and was thinking the shared 470Ohm resistor drops the screen voltage at all tubes if one screen is drawing more current, resulting in some kind of compression without being too hard on all output tubes. Dont know if that is right. I chose the common 470Ohm resistor in a 6xEL34 Output stage in a Soundcity120 to Hiwatt rebuild thinkink this would result in a more stable amp. What i can tell so far: With anode-current at 30-34mA i only have 1.5 or so mA screen current. At idle. This is rather cold, maybe thats why?

[pdf64]

Shared screen grid resistors are suggested in manufacturer’s info, eg bottom of p2 https://tubedata.altanatubes.com.br/she ... e/EL34.pdf
The individual 100ohm resistors after the shared resistor may have been added in order to act as a grid stopper especially if fitted to the valve socket (the screen grid is a grid, has transconductance) / ad hoc fuse (screen grid shorts being a common failure mode that have a high risk of significant collateral damage).