From: BILL GUYGER <[EMAIL PROTECTED]>
... What someone did was to try to make their own high(er) power
modulation transformer. There was a roughly cubical metal box with a fiber
board top. The top had 5 terminals mounted to it for the primary and
secondary connections. The top mounted to the box with 4 sheet metal
screws, and by the time I got it after it had sat in a garage in Waco for
40+ years the fiber board was soaked with oil.
I opened the top and found a 50-60 watt Stancor Mod. transformer sitting
on a piece of 1/2 " plywood with cardboard pieces packing the rest of the
box. There were also bits of steel stock that looked like machine shop
scrap because they had been turned. The whole thing had been filled with
transformer oil (which had turned to gelatinous goo) and a couple of holes
had been drilled in the covers of the Stancor transformer to allow oil to
fill its innards.
I'm guessing that this might have been something that was sold in one of
those little ads in the back of QST or some such. I'm also guessing that
the metal pieces packed into the box along with the transformer were
supposed to enhance the magnetic properties of the transformer somehow.
I suspect whoever put that modulation transformer together added the metal
pieces to enhance the weight, not the magnetic properties, and sold it,
claiming it was a higher power transformer. The guy who built the rig
probably never suspected that he didn't have a bigger transformer.
But it's a good possibility that even with the oil, that the unbalanced DC
saturated the core of the transformer.
I once used a swinging type filter choke that was rated at 5/25 henries, 500
milliamps, but only 600 volts. I took it out of its case and submerged it
in a can of pole pig oil and used it in a 2500 volt power supply until I was
able to find a choke rated for the voltage. The submerged choke never
crapped out and I used it for over a year.
Don k4kyv
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