[R-390] Anyone have a spare ballast tube?

[Jacques Fortin]

Hi Paul,

Fair Radio still have NOS 3TF7 ballast tubes in stock.
Or if you can find a 2HTF11B, it will be good also (this is the original
type used in the R-390s).
If the price asked is too much, just strap pins 2 and 4, then pins 5 and 7
of the 3TF7 socket and use either a 12BY7 or a 12BH7 in there.
No need to be a "good" tube, as far as the filaments are still good...

73, Jacques, VE2JFE