I own 4 of these incredible sounding class A quad 6l6 power amplifier tubes duel 5u4 rectifier tubes and duel 6c4 voltage amplifier tubes where 1/40th of the output of the 2nd 6c4 tubes is 180 degrees out of phase with the 1st 6c4 and is input back into the input causing the dips in bands of freequeencies to to be raised and the over amplified band of frequencies are reduced causing a very nice perfectly flat and improved frequency response by lowering anybody clipping by over amplified frequencies lowering distortion and improving the frequency response. The midrange is the hardest frequencies to faithfully reproduce and this degeneration of the frequency response does a great job of faithfully reproducing the midrange.
One reply on “RCA_MI422B”
I own 4 of these incredible sounding class A quad 6l6 power amplifier tubes duel 5u4 rectifier tubes and duel 6c4 voltage amplifier tubes where 1/40th of the output of the 2nd 6c4 tubes is 180 degrees out of phase with the 1st 6c4 and is input back into the input causing the dips in bands of freequeencies to to be raised and the over amplified band of frequencies are reduced causing a very nice perfectly flat and improved frequency response by lowering anybody clipping by over amplified frequencies lowering distortion and improving the frequency response. The midrange is the hardest frequencies to faithfully reproduce and this degeneration of the frequency response does a great job of faithfully reproducing the midrange.