[AMRadio] Thordarson transformer question

[Donald Chester]

>What's the OD and length of the pins you need? There's probably something
>around that someone will know of that's very close if you can measure the 
>ones
>you've got - when I couldn't find pins for my Johnson swr bridge, it turned 
>out
>that normal bananas with the flat blades removed yielded pins of the 
>correct
>OD (better lucky than smart, probably better both).
>
>Alternatively, round brass stock from the hobby/hardware shop is easy to 
>work
>with, and probably comes in a size very close to the right OD as well.

Another thought - something I have done more than once.  If stock round 
brass rods are slightly too large and you don't have a metal lathe, you can 
jury rig a "lathe" by chucking the rod in a small high-speed electric drill. 
  Hold a fine-tooth flat file against the rod and switch on the drill.  You 
can easily dress the rod, taking off a mill or two of diameter in a very 
short time.  With a little care and patience you can end up with a uniform 
diameter exactly the size you need.  Just keep testing by seeing how easily 
it inserts into the receptacles until you can get a snug fit that doesn't 
require forcefully jamming it into place.  I once made a slightly oversize 
nominal size shaft precisely fit a dial bushing that way.  You can fine 
tune, using emory cloth or sandpaper once you get close using the file.  Of 
course a real lathe and knowledge of how to use it would be much better.

Don k4kyv

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