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RE: Warmer sounding output tubes in VTA 70

I take it you are looking for a "warmer" midrange tone. Maybe a tad rolled off treble response?
If tube rolling is what you wish to try... maybe look at those 12AU7 tubes. You know anyone that has CBS-Hytron 5418A or 7316 tubes to try? IME, these about the best for the tone you seem to seek. Black plate version preferred. Very good tubes.

Next choice to try maybe the 1950-60s Mullard (Blackburn) or Philips (Dutch) ECC82.

Kinda hard to find good examples of these tubes. Would really be nice to try them out in your amp, before searching the World to find a good set.

Not sure what coupling caps and types of resistors VTA used in your amp. Endpoint voicing could come down to experimenting with specific component types in strategic locations within the circuitry.

Good luck!

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