In reply to G4OIG:
I used the 40A to make a 2M amplifier. I seem to recall that I got the same sort of output. I also remember very vividly the building of it because it has been the only time I have been ‘bitten’ by high voltage. I had turned the power off but was impatient and had not allowed time for the capacitors to bleed down. I was looking at my meter and not where by fingers where! My arm went into spasm and the meter got flung across the room. Lesson learned!
My shed is full of transformers but all old, even some oil filled Admiralty transformers. The only cheap source of modern transformers in terms of taps and voltages are the large PSUs for neon lights.
My best historical buy was when I was wandering through a street market in London on a Sunday morning. I stopped at a stall and was then called from the stallholder alongside.
“Mister, mister, look lovely box, two pounds”
I went to the stall and yes it was a lovely box. I opened the lid (joy - a Taylor 47A valve tester). It was hard not to smile and to force a frown. 1 pound 10/- paid. Got it home, cleaned it, checked it (glass fuse broken). Working and still is. Even had the reference cards.
And yes heavy dusting can be very destructive and even worse decision making. My mother threw in the bin a pair of Ediswan 14D13 triodes because they were “dust collectors”. I thought they were works of art