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-----Original Message-----
From: Chuck Harris <cfharris@...>
To: [email protected]
Sent: Fri, Mar 5, 2021 11:18 am
Subject: Re: [TekScopes] 547 HV Transformer: Bill Schell rewind failed

Hi Bernd,

Since the winding pattern is entirely under computer
control, I can wind anything that goes on the cardboard
former that tektronix used.

The only other issues with models other than the 547/545B,
is termination.? Small wires are easy, lugs or pins are
harder.

My highest priorities are 545B/547, 647A/B, and 576.

Anything that uses the same mounting as the 545B/547/647A/B
transformers should come essentially for free.

-Chuck Harris

widgethunter via groups.io wrote:

Chuck;Am pleased to see that your ambitious undertaking is coming to fruition.I know that many Tek owners, who weren't so fortunate as to be able to keep their scopes working, are eagerly awaiting the day.We talked about this in terms of a side business, initially.If you are able to rewind other models, as well, you may be busy enough to get there, after all these years.Bernd



-----Original Message-----
From: Chuck Harris <cfharris@...>
To: [email protected]
Sent: Thu, Mar 4, 2021 4:45 pm
Subject: Re: [TekScopes] 547 HV Transformer: Bill Schell rewind failed

Hi Bernd,

All indications are that my new machine is going to
do an even better job than the best I could do with
the old manual machine.

As an example, I was able to get 2/3 of the way to a
full wind without using the rosin/alcohol mixture that
I developed to enhance the wire's friction...

Using the rosin/alcohol, I am there already.

And, I will be using beeswax.

I'm glad to hear the prototype is still soldiering
on.? Soon, I may be able to get you the winds I promised
oh so long ago...

-Chuck Harris

widgethunter via groups.io wrote:

My memory certainly hasn't improved with age.Not much else seems to have, either...But, the beeswax thing I'd be willing to put money on - fwiw.
Incidentally, I still have not installed the 2nd wax xfrmr you made for me, but the 1st prototype continues to perform flawlessly.Bernd



-----Original Message-----
From: Chuck Harris <cfharris@...>
To: [email protected]
Sent: Thu, Mar 4, 2021 4:05 pm
Subject: Re: [TekScopes] 547 HV Transformer: Bill Schell rewind failed

Hi Bernd,

I guess the biggest indicator of a scatter wind would be
the presence of a spool.? The universal wind doesn't require
any additional support.

In addition to talking to you, I talked to Deane Kidd, and
Deane talked about Bill using beeswax, like tektronix did in
the earlier transformers.

But, like you, it has been a looong time, and I don't think
our memories are getting any better.

-Chuck Harris

widgethunter via groups.io wrote:

Hi Chuck;Assumed scatter because of the larger size of Schell rewinds.It has been a looong time, but I think I'd remember if he'd said anything about epoxy...B



-----Original Message-----
From: Chuck Harris <cfharris@...>
To: [email protected]
Sent: Wed, Mar 3, 2021 9:57 am
Subject: Re: [TekScopes] 547 HV Transformer: Bill Schell rewind failed

Hi Bernd,

There have been several discussions about Bill's transformers of
late, and there is a picture on the group, that looks very much
like epoxy varnish, or some other non wax compound.

However, it is most definitely not scatter wound.? It is a nice
looking, self supporting, universal wind.

Bill didn't use an outer tape covering on this transformer.? The
naked winding is right there for you to see.

-Chuck Harris