Cool on your Super build, I have an original 1959 and I want to remind you the original Fender tweed Twins, Bassman, Pro, Super and Bandmaster all had 1 Meg LIN Vol Pots from the factory. All the PDF schematics show Audio Log 1 Meg Vol pots but they are all wrong. From 1956 to my 1960 tweed Twin, all the above amps (5881) have the LIN Vol pots. All the other tweeds have Audio Log pots, if you want to try some in your new build. The 1Meg LIN Vol pots above are from my April 1960 Tweed Twin 5F8/A . the taper is different on the LIN pots, but Fender used them in all the (5881) tube amps. The volume adjustment is good from Vol setting 1 all the way up. The sweep is smooth. Anyone with an original ampcheck your pots, Stackpole on the 1956 to about late 1958, then CTS pots after that for mist of the amps.