239a western electric vacuum tube valve 239 nos amplifier pair preamp pre amplifier valves
vintage original tubes very very rare in pair
Western Electric company New York
239A
Similar tubes: 215A ; 215A_Nissl
Socket UX-Base 4 Pins 2 thick
Filament heater Vf 1.25 Volt / If 0.27 Ampere / Direct / Battery =
For applications where low response to mechanical shock was all-important. Low noise and microphonic 215A, was intended for ondenser microphone preamplifiers.
tube valve lampe röhre tsf 진공관 真空管 HAM RADIO audio hi-end hi-fi diy POWER AMPLIFIER Pre-Amplifier Preamp Pri stereo SE Single Ended PP Push-Pull
box 61