The 7N7s supplied by Woo were Tung-Sols. I can't see any date markings on them.
I will plug these in again with the Brimar and give them another run. Perhaps I didn't give them enough hours on the first try - it is hard to keep them in as they suck pretty hard.
EDIT - now this is odd - the 7N7s are performing very well with the Brimar. Some slight harshness and microphonics that I hope will disappear with more hours, but they are showing great promise. Not sure why I detested them on the first try - perhaps this was back when I had sucky rectifiers.
Anyway, these are not bad tubes at all. Tempted to try them in the WA5, but I don't have a 7N7->6SN7 adapter.
If the slight harshness and microphonics fade with more hours these could be winners. I have had them sitting on a shelf, unloved, for quite a few months - in fact I think I came close to binning them after the first listen. Glad I didn't.
Edited by TonyNewman - Today at 11:55 am