ELECTRO HARMONIX MQTRON MICRO Q-TRON
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Electro-Harmonix 12DW7 dual triode preamp tube. Made in Russia.12DW7 combines one triode of 12AX7 and one triode of 12AU7 in a dual triode package. System 1 (pins 6, 7, 8) is the high-mu 12AX7 triode and system 2 (pins 1, 2, 3) is the medium-mu 12AU7 triode.