I remember that amplifier from years ago, maybe 40 or so, but don't remember where I saw it. Maybe Ham Radio mag, or Orr's west coast handbook?? Looking at the deposits on the perforated metal at the far end of the exhaust stacks, it looks like both cylinders were running a little "rich". For replacements, go with whatever is cheapest or what you have the most of. Maybe Sue can donate a few to help offset the cost of some "new caps" I think I'd test each of the caps, with some independent B+, for leakage at their "V" rating. Use a hundred K or so on the negative side as a limiter, and somewhere to measure the resultant voltage/current. If all is well, fire it up. It seems to have a pretty healthy bleeder. Congratulations on your new toy, and hope its an easy tune up.