CONTROLS
OFF, POWER:
Because of the delayed warmup characteristics of vac-
uum tube equipment, a time delay muting circuit is incorporated in this
preamplifier. The main outputs are grounded via relays for approxi-
mately 90 seconds after the unit is turned on in order to suppress
warm-up transient noises. The relay grounds the outputs again immedi-
ately at turn off or in the event of any power line interruption.
SOURCE SELECTOR: PHONO, TUNER, CD, TAPE 1, TAPE 2:
This
selector switch is used to choose an input for listening.
RECORD SELECTOR: PHONO, TUNER, CD, TAPE 1, TAPE 2.
: This
control selects the signal to the record outputs, allowing the user to
record one source while listening to another.
BALANCE:
The balance control is an eleven position stepped attenu-
ator that is out of the circuit at the center position. Each step away from
center attenuates the opposite channel by approximately .75 dB. At the
full extreme position positions, there is about 3.75 dB difference be-
tween the two channels.
LEVEL:
The Evolution 20 volume control is a twenty-three position
stepped attenuator, selecting among twenty-three pairs of precision
resistors.
EVOLUTION 20 OWNER’S MANUAL
6
