[Hallicrafters] Way Off-Topic Request

[Rich Oliver]

Attention antique computer geeks:

We have a legacy device here at Lowell Observatory called the 
Solar-Stellar Spectrograph, built by NCAR to make direct measurements of 
the Sun and Sun-like stars.  We hope to keep it running for several more 
years but a recent failure has it out of action.

Can anybody help me locate a (dual) Q-Bus card made by ADAC?  It is a 
type "1620 TTL".  A "1620 DMA" might also work.  I have checked Google 
and ePay with no luck.  Any leads would be appreciated!

Thanks, Rich