Figures 1a, 1b, and 1c show the 6L6 connected as a pentode, a true triode, and a “boosted triode,” respectively. The boosted-triode configuration allows pentodes to produce pentodelike power while ...

The Triode 25 can be switched from Pentode to Triode mode at the flick of a switch, even while you’re listening to music. Pentode and Triode refers to the configuration the output valves work in – and ...

ValveFilter VF-1's main features are a switchable two-mode 24dB/octave filter (high-pass and low- pass) with Cutoff (42Hz-16kHz) and Resonance (0-20dB) controls. The valve section (modelled on a ...

Report 1938-09Abstract This report describes the fundamental differences between triode and pentode valves, and indicates how the performance of the latter type can be improved by applying feed-back.

The special feedback circuitry results in: 1st: The triode now “sees” the limited frequency response and distortions due to the modulated Anode voltage of the Pentode.

It’s also incredibly easy to build—the whole design uses only 11 components. The amplifier is designed around the ECL82 tube, which includes both a triode and a pentode in one package.