Adaptive Auto Bias; Bias Switch - PrimaLuna EvoLution Series Manual

EvoLution Series
TM
Adaptive Auto Bias
TM
Our PrimaLuna exclusive Adaptive Auto Bias circuit monitors and smoothly adjusts bias constantly and
instantly, reducing maintenance and increasing performance due to the dramatic reduction in distortion.
The genius of this design is that the Adaptive Auto Bias™ actually improves the overall sound quality
and performance of the amp. Between 12 and 30 Watts, measured distortion levels drop by over 40%. In
addition, tubes do not have to be matched, and there are no bias (re-­)adjustments needed, ever. The
new generation Adaptive Auto Bias™ circuit comes with a new extensive output stage protection circuitry
with +B relay to protect output transformers, resistors and high voltage power supply in case a tube fails.
This circuit is also protected with an easily accessible fuse located next to the on / off power switch.
Bias Switch
The EVO Tube Integrated Amplifiers come with a bias level switch. This means that by the flip of a
switch you can choose the optimum bias setting. Low Bias for EL34s (or equivalent tubes) or High Bias
for KT88s, KT120s or KT150s (or equivalent tubes). No hassle with screwdrivers, no messing around
with meters etc. If you swap tubes, simply flip the switch -­with volume down!-­ for optimum bias!
Should you use the "wrong" bias setting for the tubes in use, don't worry. It just means you did not
choose the "optimum" bias setting as decided by the PrimaLuna design team.
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