I have acquired an original Radiospares OT which has five primary connections (yellow centre tap, pair of blues - for PX4 (triode) and pair of blacks for 6L6)
Across the blues measures 0.29k and the blacks 0.39k.
Secondaries are labelled 0/2/4/8 and 15ohms.
I presume I can use this in my clone for 18-20watts
My PT is a pull of unknown make, with 5v 2A, 6.3v 1A and 250v out which should deliver over 120mA.
Advice sought please