These are getting very hard to source and ridiculously expensive when you can. $140 plus shipping out of the US is typical.

How about using two readily available transformers?

For the heaters, Altronics M2155L (1 amp) or M2156L (2 amp). These are small E-I transformers.
If you aren't running the rectifier heater 1 amp is enough for most radios.

For the B+, Altronics M4925B is a 50v secondary 30VA toroidal. 75mm diameter. A two diode, two cap full-wave voltage doubler will get you 140 volts. Should be enough unless you need ultimate performance. Will run cool and last forever.....

Whole lot, around $25 at trade prices. Won't win a concours though.

I can draw you up a circuit if anyone needs....

A good post.
And you could even voltage triple as well.
JJ

Interesting, but my radio needs 250v?

Actually, you will find it will work just fine on 140, provided the heater voltage is still 6v. The maximum power output will be down, but I doubt anyone will notice. For a 6V6, 6AQ5 etc., you'll probably get 2.5 or 3 watts instead of 4.5. That's less than 3db. You won't hear it. And the big benefit is everything is understressed. Kriesler did just this with their last valve radios so the plastic cases didn't melt!

If you really think you need 250, you can get 220v with a voltage tripler.

HT voltages in valve radios are really not at all critical, provided of course they don't exceed design maximums. Look at the 32 volt farm radios. Sure, you needed more valves to get the gain and power up, but 32 volts instead of 250 is a huge drop.

A bit off subject, but does anyone else remember the 12v space charge tetrodes that appeared in the late 50s for car radios? They worked on a B+ of 12 volts. A class A power transistor provided a few watts of audio output. An amazing last gasp of valve technology before transistors took over completely. They worked surprisingly well, I had such a radio in my FC Holden!

Yes, an excellent way to get into valve radio building.
Low voltage valves and safety for the inexperienced.
One, two and three valve regent sets that perform very well, and run on eg a couple of 9V and 1.5V cells.
Apart from the 12 volt varieties Ian mentioned.
A car battery would be regarded as safe but not liked by some for indoor use.
JJ

For safe experiments the space-charge tubes are great. No need for a car battery, a 12v plugpack or a pack of 8 alkaline D cells can power them easily.

Here is a link to a comprehensive data brief list:

http://www.angelfire.com/electronic/funwithtubes/12v_tubes.html

I just checked availability of 12AD6, 12DZ6 and 12AL8 at Tubedepot.com. All available and cheap.

An undiscovered resource?