Happy to hear from anyone else that found an available diode or an
external solution.
Jay Summit found a Diotec diode that appears to be a correct
replacement. See diotec.com and search for "tab mount" rectifiers. Their
MR2406FR, DR3506FR, and DR7506FR appear to be drop-in replacements if
you get the "R" reverse-lead option.
I have been researching replacement parts for my Curtis 1231c power
board a lot tonight. All of the parts and numbers are listed at this
blog post:
https://www.summet.com/blog/2017/01/11/curtis-1231c-replacement-power-board-components/
I believe I will be able to upgrade the diodes to 600V 75A with the
DIOTEC 7506R.
A few questions I have with upgrading the capacitors. Is having a higher
capacitance (330 uF instead of the stock 220uF) better (or would I just
suffer from more inrush problems)?
My options are to keep the 200 volt rating and get 330 uF capacitance.
or, upgrade to a 250 volt rating, and keep the 220 uF capacitance.
The third option is to just keep the stock caps which appear to be fine
and save myself 100-150$ and a lot of soldering...
I'm also considering a 250 volt 110A MOSFET (IXTH110N25T) to get the
MOSFET and capacitor max voltages both up to 250.
NOTE: I never plan on running this thing with more than my current 135
volt max battery pack, but I figure having a bit more than 65 volts of
headroom might help keep things from blowing up in the future...
Jay
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