Msg# TSF  Size #Rd  Date  Time From   MsgID        To
 3969 BN   5   0 11-Jul 1804 WA5VMS 29711_KA5BML INFO@USA (NONE)
 Sb: Motorola MICOR PA Warning


I ran into a situation a couple of days ago with a VHF Micor that I had just
received from C.W. Wolfe. Someone had attempted to repair the PA stage and had
replaced the PA transistors with a Motorola C&E part number M1133. Obviously,
the person did not realize that the VHF Micor radios use PNP RF transistors
in the final rather than NPN like most other radios. The M1133 is a NPN and the
person blew about 60 dollars worth of transistors. For the record, this is the
only radio received in this area out of the 20 or so ordered from Wolfe that
had any major problems. I have seen a lot worse from other vendors. As a point
of information, the radio did make about 12 watts of RF, the shorted PA trans-
istors allowed the driver stage to feed through to the antenna. The moral to
this story is, if you replace the PA transistors in a Micor, use only the
Motorola C&E part or the following Motorola "generic" parts.

         Transistor           C&E Part #           Generic
          M9622               48-869622            2N6094
          M9623               48-869623            2N6095
          M9624               48-869624            2N6096
          M9625               48-869625            2N6097

Good luck with the Micors. If you need further info, contact me on the TexNet
PMS at MKOTST or WB5AOH-9 BBS (WB5.OK.USA). The PMS is read by me every day
or so and the BBS maybe once a week.
73, Joe WA5VMS





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