Page "Geddy Lee" Paragraph 12
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From there it is split between a Trace Elliot Quadravalve all-tube power amplifier and a SansAmp RBI rackmountable preamp.
The speaker-level signal from the Quadravalve is sent to a Palmer PD-05 speaker emulator, which provides adequate load for the tube amplifier and attenuates the signal down to line level.
The signals from the U5, Quadravalve / PD-05, and RBI are all sent to the monitor and front-of-house mixers and blends of the signals are changed on a song-by-song basis.
Typically the Quadravalve / PD-05 signal makes up the low end while a balance of the U5 and RBI make up the high end, with the RBI providing the " top end " distortion in Lee's sound.
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