I don't have mods to share but if you do go down this road I'd suggest sending it to Jeff Grawicki (not exactly sure on last name spelling) at Soniccraft. He's experienced and very knowledgeable at modding tube gear.
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Bypass the volume control
Replace cheap coupling caps
Replace cheap resistors in signal path
This is a great start. The power supply could also be improved by using more capacitance, using chokes instead of the power resistor .....
Use good solid core copper wire.
I have done this plus more to great effect.
Are we talking about Tube Audio Design TAD-60? If so, do you remember how many coupling caps and their value?
I have its schematic here, I see two .47mfd 400V from 12AU7s 12AU7s ? (I see one .1mfd 400V but not sure)
BTW: I took your advise on jb JFX caps on my Carver 180 - great result and way cheaper in compare with other brand