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In Reply to: If the amps are "true balanced",... posted by Lew on December 20, 2014 at 12:36:12:
Hello Lew. Thanks for your imput. If I understand your post correctly my explanation about these amps was too sketchy. These amps do not have individual gain/driver stages dedicated to RCA signal-ended signals and another set dedicated to XLR balanced signals. The following amplifies on my understanding of the operation of the amps.
Each monoblock has true balanced driver, gain and of course a balanced output push pull stage. Via the amp's XLR input, the hot signal (pin 2) feeds directly into the Phase A driver stage and the cold signal (pin 3) feeds into the Phase B driver stage. [Or is the gain stage 1st?] These signals continue balanced throughout the amp, e.g., there's a Phase A and a Phase B gain stage. FYI: For each monoblock there are (2) 6SN7 driver tubes and (2) 6SN7 gain tubes.
This design enables the signal input into the amps from a true balanced source to remain entirely in true balanced format as the signal passes through the amp--without phase inversion any place. And there should be sonic benefits for keeping the signal in balanced format from source to speakers. My understanding, which could be incorrect, is that when a balanced signal is input to some amps via their XLR inputs the signal goes through phase inversion via a transformer or other components, which adds complexity and causes some signal degradation.
Using the amp's RCA inputs on these amps simply adds a phase splitter in front of the above mentioned balanced driver stage--no other circuitry is added.
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- As I undestand it yep these amps are "true balanced",... - JazzDude 14:16:43 12/20/14 (0)