Thoughts on Jimmy Page’s Super Bass Marshall?

[WhopperPlate]

A lil birdie told me:

Super bass spec

Treble channel 560p 270k v2 grid

.68uf cathode bypass v2

150p treble bleeders on each plate of PI (with 47p snubber)

220k bias with 6550s

[Roe]

A lil birdie told me:

Super bass spec

Treble channel 560p 270k v2 grid

.68uf cathode bypass v2

150p treble bleeders on each plate of PI (with 47p snubber)

220k bias with 6550s

560p 270k v2 grid could be standard values for the channel mixer? Or is there a big grid resistor in addition with a bypass cap?

[WhopperPlate]

560p 270k v2 grid could be standard values for the channel mixer? Or is there a big grid resistor in addition with a bypass cap?

Nothing additional …just channel mixer… bright channel of course

Also, 47k nfb off spkr jack