Icom IC-R70 Modifications


Icom IC-R70 Mods

Thanks to Arthur de Maine, this PDF contains details on how to modify the Icom IC-R70.


3 responses to “Icom IC-R70 Modifications


    Hi .
    After 40years of careful practice I have recently manged to fry up a CPU processor on a R70 by feeding unregulated B+ on regulated simply by reading rear plug connections upside down,,,
    Does any out there has or knows where a spare logic board or D650C 070 processor ?

    • Jules - K2KGJ

      Can’t help on the processor but I think I can top your goof. After 50+ some years of careful tech work, I crossed two coax jumper connections on an Icom 706MkIIG and blew out the HF finals and HF driver plus as well as a couple of passives. Original MOSFETS no longer available …. found a PA board pull on eBay with two good finals and a good driver. A couple of days of bench time with a vacuum desoldering tool and ChipQuik low melt solder removal alloy and it’s operational again. Good luck on your R70 … need to replace all of the trimmer caps in the PLL on mine.

  2. Thanks. I’ve already made a lot of mods for my R70. It’s a perfect receiver.
    In the 80’s I made de R70 computer controlled with my Sinclair ZX81 computer.

    Anyway, greetings from The Netherlands – (Europe)

    Juul – PE0GJG

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