ST-120 Triode/Pentode Switch
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VTA Tube Amp Kits - All the Dynaco VTA amps may be run in either ultralinear mode or triode mode. They all have a switch that allows going from one mode to
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Using the Pentode/Triode Tube as the Amplifier/Phase Splitter.
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triode/pentode switch on self-bias 6l6's
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