Several years ago I found a surplus Redifon 551 receiver. This is a
transitorized boat anchor (a really heavy anchor!). Is someone using
it?. I need the Schematics or Service Manual. Mine came with all the
connectors but no indication of how to power it.

I am also looking for the Service Manual of a Collins 51-S1. (it is
out of calibration.

Thanks.

Ramon Leon