SYLVANIA U.S.A.12AX7 / ECC83. NOS 12AX7 / ECC83 BLACK-PLATE. 12AX7 = ECC83. 1955 SYLVANIA USA JHS 12AX7. Here’s your chance to upgrade to a SYLVANIA 12AX7 TUBE! JHS 12AX7 “SYLVANIA USA”. RARE “SQUARE” GETTER.
SYLVANIA U.S.A.12AX7 / ECC83. NOS 12AX7 / ECC83 BLACK-PLATE. 12AX7 = ECC83. 1955 SYLVANIA USA JHS 12AX7. Here’s your chance to upgrade to a SYLVANIA 12AX7 TUBE! JHS 12AX7 “SYLVANIA USA”. RARE “SQUARE” GETTER.