Aries Cerat Ianus Ageto Gen 3 Preamplifier

The electron flow is impeded by the grid, a negatively charged wire-grid structure, placed between the cathode and anode. This operation resembles a typical fluid control valve, hence the name valve tube. Inside an Inverted Triode tube the electron stream emitted from a heated cathode is accelerated towards the anode, now a wire-grid-like structure . The electron flow is now unimpeded since no grid structure exists between the anode and cathode.

Instead, a plate-like structure, enveloping the cathode/anode assembly, called the control “grid” is shadowing the anode electrical field, having a very high negative electrical field itself, thus “pushing” the electrons away from the anode. This mode of electron flow control is completely different than a triode mode of operation.This new method of electron flow control comes with some very interesting operating parameters and unique technical features, which we make of good use in our Inverted Triode circuits.

An example of the Inverted Triode’s technical advantage over a typical vacuum tube,ex 300B,is a comparison of the two  ,driving the same output transformer. The Inverted Triode tube presented a power bandwidth of 2Hz-500.000Hz where the 300B tube had a bandwidth of 15Hz-100.000Hz. Same transformer, same driver tube, but 5 times the bandwidth for the Inverted Triode tube.