You may replace the 6550 tube in the PS with NOS TungSol Black Plate 6550 from the mid 50s (or second tooling Gray Plate from the 60s), and 6H30 tubes with some NOS types from early 80s.
I'm awaiting NOS TungSol Black Plate 6550 tube myself as we speak, so I will let you guys know.
I'm awaiting NOS TungSol Black Plate 6550 tube myself as we speak, so I will let you guys know.