I've been winding my own high frequency power transformers for a while now, and
I'm a novice at it.
A few months ago, this was posted to the amps reflecter, you might find it of
Paul Decker (KG7HF)
----- Original Message -----
From: "Patrick Barthelow" <firstname.lastname@example.org>
To: email@example.com, firstname.lastname@example.org
Sent: Friday, May 7, 2010 5:25:55 PM GMT -05:00 US/Canada Eastern
Subject: RE: Uruguay Amp Project
For your comments.
I wonder what is involved in revbuilding/rewinding a high voltage/high power
transformer, say similar to what you find in a SB 220. And how much/what kind
of damage happens when they fail.
If you took the bells off a Heathkit cooked B+ transformer, I would bet you
will find, melted plastic bobbins perhaps carbonized, interwinding layer paper
that is scorched/burned, Perhaps carbon tracks on paper, plastic bobbins, or
across core laminations. Assuming you could get replacement bobbins, and
suitable wire for the primary and secondary windings, would anyone with
experience in these matters clue us in on whether in a pinch, in the wilds of
South America, if it is a doable task, assuming wire and bobbins, and suitable
high temp paper and tape could be obtained? Does anyone have any specs on the
factory wire used in Heathkits, Kenwoods, Ameritron, Peter Dahl, etc, as to
guage, and number of turns, length of each guage wire used, etc.., I found a
fair amount of theory and photos of the art of transformer winding on the web.
73, de Pat Barthelow AA6EG
Date: Fri, 7 May 2010 20:17:58 +0000
Subject: Uruguay Amp Project
A couple of ideas for you. Firstly, my wife's uncle used to run a very
successful motor rebuilding shop in Colombia. Most of his work was for the
commercial marine industry. They built and rebuilt all sorts of motors,
alternators, and transformers. So you might check with a local motor rewinding
ship, I'm sure they are still in existence there.
Secondly, there are some "other" ways to get things south without paying huge
customs. Ask around for a local hauler who makes trips north. You might find
a trucker who goes out of the country, who knows another who goes farther
north, and yet another who goes farther north. I know of cases where large
goods i.e. refrigerators, TV's, etc have been hauled overland via the gray
market truck drivers...all the way from Massachusetts no less.
Paul Decker (KG7HF)
Date: Fri, 7 May 2010 09:11:13 -0700
From: Patrick Barthelow <email@example.com>
Subject: [Amps] Uruguay Amp Project
Content-Type: text/plain; charset="iso-8859-1"
Thanks all for your helpful contributions.
What a brain trust we have here on the reflector.
So, if anyone in SA has an Amp, homebrew or otherwise that they want to fix,
or even donate, or sell to this effort in Uruguay, please get in contact, with
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