I have for sale the HF receiver Collins 51S-1 + 312B-3 speaker. The
receiver is in good working condition like the speaker. I have a copy
of the manual and diagram.
You can see phtos and other informations at:
http://pwp.netcabo.pt/0153628801/TROCAS.HTM
73, CT1BRM
JM NUNES ---- Lisboa ----- PORTUGAL