more bass please?

[foxfire]

i got myself a new old amp. it's a Sunn 350L which is just a relabeled Sunn 1000/12000. anyway even with the bass pot maxed i could still use a touch more low end. i've got a schematic but i don't recognize the tone stack. my gut reaction would be to bump up the 0.022µF on the wiper of the bass pot but i wanted to check with those that actually know what they are doing?

 

[Johan]

it's a regular fender style tonestack drawn slightly differently. I think the values correspond to a tweed bassman.  Marshall used these values in the Super Bass.
change the slope resistor (56K) to something smaller like 33k
refering to the super bass again, it would seem counter productive to have LESS bass through the eq, but it kept the lows from saturating to early. then they made up for it by using bigger decoupling caps in the poweramp.
Johan

[foxfire]

sounds good,thank you much!