28 Feb
2007
28 Feb
'07
5:53 a.m.
> - Input mains: four wires, two windings, which
are connected in
> 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
> running normally.)
> - 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.
One further note - on a scale of 1-10, how authentic do you want the
repaired scope to be?
If the answer is 0-2, consider replacing the HV and B+ rectifiers with
solid state - this eliminates three filament windings - assuming you
generate the HV via another means as I suggested in my last posting,
all you need now is the main filiment windings and the CT B+ windings
which should not be all that hard to find in a single transformer.
If the answer is 10, you could consider rewinding the transformer -
I can provide some more information on this, but if you've never done
it, it's not all that much fun (it's not fun if you have done it before
either). Btw - I just did a google search on "transformer rewinding"
and there are a few people advertising that they do this... Might not
hurt to make a few inquiries.
Dave
--
dave06a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Collector of vintage computing equipment:
http://www.classiccmp.org/dunfield/index.html