[Motorola] P23AAM Help needed

[Tom B]

Hi Jack,

The wiring for the dry cell pack on the A and B versions are wired 
differently.  The schematic I have for the A version is dated 12/56.
The B version manual I have is dated 11/61.
I am not sure when they switched from the old numbering system to the new.

The A version schematic shows that external power is connected to the 4 
pin Jones plug.  For 12V operation, pins 1 and 3 are connected together 
and pin 4 is negative and pin 2 is positive.
The chassis is positive ground.

Tom

On 6/3/2015 9:34 PM, Jack Antonio wrote:
> Tom and Geoff
>
> Thanks for the information on the transistors and possible
> replacements.
>
> The NU-137 schematic I have is from an H21 manual, dated
> 3/56.  The supplies on the H23AAMs are NU-137-3, and
> the date stamped inside radio is Dec. 1959. The radios
> themselves show the newer Motorola NLD-xxxx style numbers, but
> the supplies are from the older numbering system.
>
> The problem with the schematic I have is with the
> connector for the external cable, it appears the
> pin numbers have been transposed. As drawn, I don't
> see how the supply would have worked. I ohmmed it out
> and figured out some of it, but there are still
> some differences in the base biasing networks between
> the schematic and the supply itself.
>
> On the Z radios, I also have an AN/PRC-59, which looks
> like an H23BAC with a Coast Guard nameplate. Haven't done
> anything with it as yet.
>
> Thanks
>
> Jack