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I use a Curtis controller on my ET with a MC7 for
the field and it has a reverse built into the board. Just modifying it to use
the pot and switch for the Curtis which has a start switch and I put a second
switch on to put the MC7 in full output till the Curtis controller is at full
then it puts the control over to the pot of the MC7 and you can speed up with
this to change the out put to the field down to 6 V. The MC7 is available
at http://divelec.tripod.com/id1.html
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