I am now Annoyed [Re: Old oscilloscope help: ideas sought]
mouse at Rodents.Montreal.QC.CA
Wed Feb 28 10:02:25 CST 2007
> One further note - on a scale of 1-10, how authentic do you want the
> repaired scope to be?
I'm a bit Tonyish on this: I'd take unauthentic but working over
authentic but broken any day. :-)
I'm mostly looking for a working 'scope cheap, basically. If that
means an external pod with a half-dozen transformers in it, well, so be
it. It's not as if I'd be making it impossible to rip that out and
install a single replacement if I manage to luck into one.
> 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
I was thinking about something like this, yes. I haven't traced the
circuit enough to be certain, but I think that if I leave the rectifier
tubes out of their sockets, I should be able to drive the B+ and HV
lnies with pretty much anything that can supply the required voltages
and handle the current draw.
I was actually considering replacing most of the circuitry with
solid-state stuff, leaving just the last couple of tubes to drive the
> 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.
That's something I've been considering too, finding someone who does
custom transformers. With proper equipment it should be pretty easy,
I'd think, but you sorta have to do it as a business to amortize the
cost of the gear over many jobs to make it worthwhile.
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