![]() ![]() So, the 12AX7 is best used as a class A amp, in the signal path (if its used as an amplifier), and the phase inversion and symmetry (or not) is taken care of immediately before the output section.Īpart from the vital valve tone this ingenious power amp design provides, it alsoĪllows us to replicate various 'circuit characteristics' that are unique to the all-valve ![]() Why two triodes then? Just to have another one to use for whatever. at the midpoint, and both top and bottom halves of the signal waveform are conducted. Class A amplifiers are biased such that the output is set between shutoff and saturation. There is no reason at all to run a 12AX7 itself as a push pull design. The adjustment (circuit design) of the phase inverter determines the output symmetry, regardless of the hardware that does the output. This is the same on solid state, tube, or hybrid amps. All push pull amps have some sort of phase inverter to which provides near identical, yet mirror image waveforms to the output. more like a 'I wonder if.'Įvery Class A/B audio amp must be push pull. ![]()
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