Mullard Magic: For All Your Vintage Valve and Radio Needs!
EL33, MULLARD, N147, MATCHED PAIR, BLACK GLASS, BLACK BASE, WHITE PRINT, 1007 1K7, MANUFACTURED NOVEMBER 1951 1953
EL33, MULLARD, OLD SHIELD, WHITE PRINT, PENTODE, 6AG6G, 6M6G, BVA266, CV2938, KT61, N147, PP6BG
KT61 OSRAM BLACK BASE FROM NOV 1953