Been awhile any updates?
Hi Tune -
Thanks for asking!! Now moving house, putting another brake on progress
I did get a NOS RCA rectifier tube from a friend of mine though: he was carrying a box of tubes and I jokingly asked if he fancied trading one rectifier tube for a bunch of vintage tubes I got from a Hammond organ amp (I'm a Hammond player). He pulled one out of the box and we're both damn pleased with the trade!! He needed the 12AX7s for one of his guitar amps.
Hopefully I'll be moved in soon and I'm gonna start up again. Of course, now I'm in the position which I hate, where I've lost track of what I still have to do on the project (thus exponentially increasing the chances I'll mess something up).