[GreenKeys] Question about URA-8 A B

[Randy or Sherry Guttery]

Nick England wrote:
> Maybe the date can be determined from the two manuals - I'll look at mine at
> home tonight. 

Thanks... that would be interesting.


> I don't have any idea if there was a Field Change to add
> blowers to the early model.

That's the thing - I'm almost positive I've had some "A"s over the years 
- and all of mine had blowers. So you may be quite right about either a 
formal "field change" - or an informal one that was just done by 
individual commands.  I know if I could just "bolt on" a blower by 
ordering a spare part - I bloody well would.

That also begs the question about the access plate on the "unmodified" 
"A"s - it's like they were designed for a blower - (with the connector 
angled underneath, etc.) and then "someone" made the decision to leave 
them off and just "blank" the hole. I noticed in the original issue of 
the manual (NS91278 Hoffman 1949) they "tout" the sealed cabinet... so 
by the time the manual was printed this seemed more important than 
ventilation. The manual also states that all tubes (save the CRT) should 
be pulled and tested every 500 hours. That indicates they were aware 
that the tubes in that environment would "cook"...  Really strange!

Thanks! and best regards...
-- 
randy guttery

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