The Fender 022772 specs 325-0-325 70mA for the B+ voltage. All the 022772 PTs I’ve seen are in the 325-330v range and work great in the Two Stroke (and a bunch of other small amps). Heyboer makes great transformers as does Magnetic Components, Mercury and Hammond. I’ve used a few of the imported Weber 022772 transformers and had great luck with those as well. BTW, 275v might not be bad either, especially with a solid state rectifier.