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51J4
Collins 51J4
GW4FRE signal on an old Collins 51J4
Vintage Collins 51J4 Ham Shortwave tube type receiver Dead DOA Major repair Peter Dahl transformer
51J4 with Product Detector Installed and AGC circuit corrected
51J4 - Back to Stock Circuit
Playing with an old 1960 Collins 51J4 Receiver during garage #2 radio cleanup...
collins 51j4 ricezione 10 metri am
Collins 51S1 , Collins 51J4 - 9a2us
51J4 - Investigate
Collins 51J-4
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Last Updated: August 23, 2026
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