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AUDIO VALVES: ECC31 6N7G NR73 CV1285 CV1956 TWIN TRIODE

The ECC31 is a twin triode audio output valve. Imbued with a powerful heater and a common cathode cage these hallmarks belies it’s true purpose as an audio power valve capable of 10W dissipation when operating push-pull.

Often confused for the legendary ECC32 small signal triode as it shares a similar envelope, the key is in it’s totally different pin out and the half screeded envelope.

ECC31 

 

6N7, RCA, METAL, FEBRUARY 1944 MANUFACTURE

6N7, RCA, METAL, FEBRUARY 1944 MANUFACTURE
6N7, RCA, NOS, CV1957, VT-96

6N7, RCA, NOS, CV1957, VT-96
6N7G, DELCO, NOS, CV1957, VT-96

6N7G, DELCO, NOS, CV1957, VT-96
6N7G,NATIONAL UNION, NOS, CV1957, VT-96

6N7G,NATIONAL UNION, NOS, CV1957, VT-96
6N7G,PHILCO, NOS, CV1957, VT-96

6N7G,PHILCO, NOS, CV1957, VT-96
6N7G,SYLVANIA, NOS, CV1957, VT-96

6N7G,SYLVANIA, NOS, CV1957, VT-96
6N7GT, BRIMAR, ORANGE PRINT, BLACK BASE

6N7GT, BRIMAR, ORANGE PRINT, BLACK BASE
CLEAR TOP SCREEDED BOTTOM MULLARD WHITE PRINT ECC31 WARTIME MANUFACTURE - MULLARD MAGIC

ECC31 CLEAR TOP SCREEDED BOTTOM MULLARD WHITE PRINT WARTIME MANUFACTURE
ECC31, MULLARD, RED PRINT

ECC31, MULLARD, RED PRINT
ECC31, MULLARD, RED PRINT

ECC31, MULLARD, RED PRINT
NR73 CV1285 ADMIRALTY MIL SPEC ECC31 WARTIME MANUFACTURE BY MULLARD

NR73 CV1285 ADMIRALTY MIL SPEC ECC31 WARTIME MANUFACTURE BY MULLARD