01-25-2025, 03:43 PM
Apparently a substitute for the 6C7 is an 85, so that would look less out of place then a 6R7, but there are 6C7s out there, 6E7s are a little harder to find. For the 6Y5 I would just make an adapter for an #84 tube, six pin to five pin.
Regards
Arran
Regards
Arran