What powered the WT Equipment

Jim Dell has a query,

Can anyone out there advise post WWII, what powered the WT equipment on the Black Prince, Bellona and Loch Class Frigates – DC, AC or a mixture of both? If anyone can help it would be much appreciated.

Pete Smith has responded
Don’t know about Black Prince was modernised but her original fit was identical to Bellona, being 57 & 59 fed by 400V AC for finals but with DC for PA triode filaments.
Original fit for Loch Class was 240 AC for 89 and B19/B28/B29. TBS & 60EQR were originally DC powered, TBS via a 110V DC Genemotor. Can’t recall whether original 60EQR came from Genemotor but seem to recall there being an AC generator fitted in the main passageway but whether this was for emergency use now eludes my internal neutrons.