One is the PA-521 which is for the dual channel ST-70. Those with 240 volt mains can also use this power transformer as a base for a custom dual channel 35-40 watt amplifier based on EL34, 6L6, KT66 or KT77 tubes.
240 volt PA-521 power transformer
Also available is a replacement 240 volt transformer for the Dynaco SCA-35 integrated amp or the Dynaco ST-35 power amp. It is the PB-028-1. Those with 240 volt mains could also make use of this power transformer as the basis for a custom EL84 or 6V6 dual channel amp.
240 volt PB-028-1 power transformer