1 Mullard CV378 tube.Bought this as NOS, I put maybe 20 hours, run tested in a modwright power supply. Can be used for 5AR4, 5U4, GZ33, or GZ37 (but please check with manufacturer first!) In original military box made in the 1960's. Similar to the GZ33, but the net result with be a small drop in plate voltage to your power tubes and perhaps a slightly softer top and bottom.
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