Can someone tell me this difference - 5E3

[Magnatron]

Can someone tell me what this does between the Hoffman design and the original schematic for the 5E3. Is it necessary or helpful to have the circuit change?

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[xtian]

Screen resistors serve as current limiters, and help prevent burning up your tubes. These have little effect on perceived performance, and are a good, modern update to classic designs.

[martin manning]

...and stop oscillations.

[bepone]

..affecting the tone and slightly compression

[Magnatron]

..affecting the tone and slightly compression

Can you elaborate on that? I plan on using this amp as a harp amp, so nice non-flubby bottom with early breakup at mid-volume settings are the target.

[bepone]

..affecting the tone and slightly compression

Can you elaborate on that? I plan on using this amp as a harp amp, so nice non-flubby bottom with early breakup at mid-volume settings are the target.

higher value of g2 resistance but also resistance coming from Ub+ line (is added to those g2) will give you compression and feeling , more resistance bigger compression, you need to experiment with the values.
original schematic without resistors is not good from upper mentioned reasons

[maxkracht]

470R is the usual Fender value, but anywhere from 100R - 2k is pretty common.

[Stevem]

Needing them at in terms of a push pull class A amp can depend on your plate voltage.

Once you get close to 300 on the plates it’s good to have a 100 ohm resistor on each off of the B+ feed to them.
You don’t want the screens sitting at the same voltage as the plates .

99% of the time when a power tube shorts out and blows your fuse it’s because the screen was over taxed and literally opened up and one end of that broken winding shorted to another.