The RCA T80 information has been sent.
Since the 6U5 tubes start to lose green glow after a few hundred hours there is a big demand for them. Many of these tubes are for sale at flea markets or swap meets but they may not have a green glow in a radio. They may test good on a tube tester meter without having the required green glow.
For radios with a power transformer using parallel wired filaments you may want to consider the 6AB5. It's not as well known as 6U5 so is less expensive.
Norm
: I am restoring a RCA T-80 and was hoping that some kind soul would have a digitized schematic they could/would send me. Also, what the dickens makes the 6U5 so very expensive ? I understand now why the slot was empty and taped over, although I do intend to replace it.
: Any response will be greatly appreciated.
: Thank you.
: Pete.