Owner`s manual
ATOMIC AMPS REACTOR 50/50 MANUAL
7
Your Atomic Reactor 50/50 is vacuum tube driven, and therefore requires
maintenance. Power tubes have a life expectancy of approximately 1000
hours. Regular play requires regular service.
Tube Replacement: The 50/50 ulizes 2 × 12AX7 tubes and four high
quality JJ brand 6L6GC tubes, selected because they oer excellent sound
quality. You will noce degradaon when tubes need to be replaced. The
power secon is built to work with any properly biased 6L6 or EL34 tube.
When tubes need to be replaced, use a qualied amplier technician.
Output Tube Bias Adjustment: A technician will bias your amp when new
tubes are installed. However, you may nd bias dris over me. You can
check and adjust this yourself. Each channel of the Reactor 50/50 is
equipped with a front panel bias test point and adjustment point. A
common ground serves both channels. The bias trim sets the idle current in
the output tubes, properly matching the amp’s performance characteriscs
to the type of tubes used. Each tube type and brand may require a slightly
dierent bias, and sengs should be checked when tubes are replaced. A
properly biased amp will sound great and will run reliably and safely. An
amp’s bias can dri with extended use. To bias the Reactor 50/50, turn
main power ON and take the desired channel out of STANDBY. Touch the
negave lead (black) of a VU Meter to the common ground on the front
panel of the Reactor 50/50. Touch the posive lead to the test point for the
channel you plan to adjust. Adjust the trim with a small athead
screwdriver unl the meter reads in the range of 70–90ma. Once the rst
channel has been properly biased, put it in standby and repeat the bias
adjustment process for the second channel.
Front panel bias controls of the Reactor 50/50.