[Premium-Rx] 0T - Racal MA1724 Drive Unit

[GandalfG8 at aol.com]

Hi All
 
Apologies for the off topic posting but there's no information to be found  
online so I'm hoping there may be somebody here with knowledge of this  
unit.
 
It's a Racal MA1724 drive unit, similar size and vintage to the MA1723 but  
this one has ten crystal controlled channels so no internal microprocessor  
or synthesiser and no LCD displays.
 
I've had this a few years and recently decided to sell it as I'm unlikely  
to ever use it now but then discovered that although I bought it  as "new", 
and it still looks to be new and unused complete with  original inspection 
tags, it also looks to be missing a circuit  board.
 
>From the markings on the adjacent floating cable mounted connectors this is 
 probably PCB number 4.
However, there's no pillars fitted for the PCB and no marks on the  
metalwork to indicate that anything might have been fitted and then  removed.
This lack of fixings might indicate this was space for an option not  
fitted but then I would have expected the unused connecting cables to be  better 
secured.
 
If anyone could throw any light on this it would be much appreciated, as  
would any other information about this unit.
 
regards
 
Nigel
GM8PZR