Thanks for reading.
I recently purchased a rare matched pair of NOS 1961 Melz 6H12C tubes with well balanced sections.
These were bought for an amplifier that takes 6BL7 tubes but, after looking at the data sheet curves, I believe that they would not sound optimal in the circuit used in my upcoming amp (should have checked first).
These can be successfully used in certain amps that use 6SN7 tubes. Search the 6SN7 tube thread to see results.
There is a...