On Nov 25, 19:41, Tony Duell wrote:
  The DEC LED module looks like a bi-pin bulb, and has a
plastic base
 moulding hiding the resistor, etc. It sounds like you have something
 home-made, perhaps. 
It was done by someone who was obviously patient, and very neat.  They look
identical.  I wonder if it was a DEC field mod?  Unlikely, I suppose, as
Field Service would have had the modules.
   The resistors
look like modern miniature metal film, but could =
 be
 20 years old. 
 They are not exactly critical :-) 
 
No, they're not :-)  I was just trying to guess the age.
--
Pete                                            Peter Turnbull
                                                Network Manager
                                                University of York