11
Tube Layout and Requirements:
V1, V2 and V3: JJ 12AX7 (Preamp)
V4: Sovtek 12AX7LPS (Phase Inverter)
V5 and V6: Tungsol 6L6GC output tubes
V7 and V8: Rectifier tube sockets (V7 loaded with Diode Adapter, V8 GZ34 Tube Rectifier)
Bias Adjustment
Your AMERICAN DREAM MKII comes from the factory biased for 6L6 tubes. Bias adjustments are not
intended to be user-serviceable. Attempting to adjust the bias yourself will expose you to very dan-
gerous high-voltage electricity that can kill you. Special test equipment and knowledge of amp cir-
cuits and tubes are required to perform this function. DO NOT ATTEMPT TO DO THIS YOURSELF.
Tube Replacement
WE RECOMMEND TAKING YOUR AMPLIFIER TO A QUALIFIED TECHNICIAN FOR SERVICING YOUR
TUBES. Make certain the amplifier is turned off and has been allowed ample time to cool down. Be
very careful when you remove the tubes as they might still be very hot! Do not touch tube sockets
with fingers! Even after turning your amp off and unplugging it from the power outlet there could be
enough voltage stored in the capacitors to give you a lethal electrical shock.
WARNING:
• Do not remove the back panel.
• Do not attempt to check or replace tubes yourself. Refer to an authorized service center.
• Never touch the tubes while the amplifier is turned on or has recently been turned ON. You can
Operational Notes:
TUBE CHART
.5”
#8
#8
V1
preamp
preamp
tremolo
output
output
phase inverter
diode
rectifier
tube
rectifier
V2
V3
V4
V5
V6
V7
V8
