![]() ![]() This is not a big deal as virtually all audio equipment is of a parallel filament design. This can only be used in parallel filament circuits. If you see anything missing from the list, please add to the comments.12AX7: the original version of this tube, released in 1947. GTA – improved uprated version – plate dissipation 7.5wĦSL7 (mu: 70): Released – June, 1941.WGT – the final ruggedized version with heater-cathode voltage uprated from 100v to 250v.W – rugged military version, glass envelope with metal band.There are no variants for 6DJ8 due to its later production date.ĦSN7 (mu: 20): Released – March, 1941. ![]() WA – rugedized version with low-microphonic and noiseĦDJ8 (mu: 33): Released – May, 1958.WC is the final version.ġ2AX7 (mu: 100): Released – September, 1947. WA, WB, WC – rugedized versions with low-microphonic and noise. ![]()
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