Hey SC, it was a while ago
, I've put Mullard long plates in both my MP2s (the short plates are more recent but I'll give them a try next tube change). I use one MP2 in my recording rack and the other (I bought new many many moons ago) is still the mainstay in my live rack. I fell for the Mullards from the start, best tubes I've heard in MP2, I love them, and as I've said before, they track your fretting in ways I'd never thought possible (3D??), the slightest change in finger pressure is tracked by the tube, and they love to squeal off harmonics mmmm. And plenty of gain
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The patches I use are my tones, I haven't tried to copy other sounds (I used to a bit more when I had MP1 and played lots of covers from different bands, but even then I just went for what I liked). I put some new tubes in my old 1972 Marshall 50 a while ago and gave it a run, it was my amp/sound for many years, it was ok, but nothing compared to MP1/2....
I've not tried different tubes in V1/2, I love the sound I have with the 2 Mullard long plates. For 3TM MP1s the short plates may be a better choice (based on MJMPs advice re 3TM tube choice) as sooo much gain and they should be a little less microphonic.
Anyway, based on both SCs MP1 experience and my subsequent MP2, my advice (for what it's worth) is put a pair in and drool
There was another member who went with the short plates for his MP1 and loved them so it's not uncharted waters.