AN/SRR-19?

[George Babits]

Can anyone direct me to a source of information on the AN/SRR-19 receiver? 
I know it is VLF (930-300 kc) and made by National.  I also saw somewhere 
that it uses mostly nuvistors.  I have a pair of these beasts and would like 
to at least see a block diagram.  Alternatively; anybody want one or two?

73,
George W7HDL 

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