- Input mains: four wires, two windings, which are
parallel for 115V operation and series for 230V operation.
- 5VAC filament winding for B+ rectifier tube.
- ~800VAC CT (400-0-400) winding which is rectified for B+. (With 26V
on the 115V-nominal mains primary, this measured 176V, or ~778V when
- Filament winding for one HV rectifier tube.
- Filament winding for the other HV rectifier tube.
- HV supply winding.
- 6.3VAC CT winding to run the heaters for most tubes. (There are some
12V-heater tubes, but they all have centre-tapped heaters.)
- There is one more wire unaccounted for. On opening the transformer
case, I find it is a case ground.
They are probably old/collectable enough now that you wouldn't
want to part out a "good" one, but if you can find a dead/partial
one, old B&W console televisions often have nice transformers
with several 6.3v filament windows, a CT B+ winding, and often
several others thrown into the mix. Later model "portable" sets
with hot-chassis don't, but some of the old consoles do. Probably
won't give you everything you need, but you might get away with
only two xfmrs.
You won't get the HV winding, but you may be able to generate this
with a voltage multiplier - I built my first scope "from scratch",
and used an old TV transformer, and a tripler from a 600v winding
to get the 2kv needed for the CRT. It worked very well.
PS: I have a friend who's into restoration of old tube type gear,
I'll forward your posting to him on the off-chance that he might
have something similar, or an idea of where to find one.
dave06a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Collector of vintage computing equipment: