In the late 70's I had a set of Mark 3's and a pas 3 that I modified. I remembered this setup having a very musical sound.
Will to make a long story short, after testing, here is what I have for my small amount of money.
All transformers are good, 3 GE Great Briton EL34s tested good which I think are fx4 Mullards, 2 GE 7199, both tested good but one is a little gassy, this was not detectable when played. The 5ar4 worked fine but fried when the old can cap decided to short. Choke has over heated at some time. Needs replacing but still works. I have played both channels one at a time and was surprised at how musical the mids. and highs were and how very quiet the whole amp was. My speakers are 99 DB/ one watt so they don't like noisy amps. Bass was its weak point. Over all I like the sound.
Everything else probably needs replacing. Rust on the chassis, board working but original parts etc.
The question is,what would you do with this amp.