Hola Jose, Well, I have uploaded the 5370A manual of 42MB last October to David's site, and it seems to be still there: http://www.g8wrb.org/data/HP/ (circuit diagrams are stitched for plotting on A1/A0 plotter.) There's a picture on p. 252 (8-93) of this 'A' unit, 3 PCB spares can be seen, plus one additional space without a socket. Frank Stellmach
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