PRESENCE: Power amp control of high frequency variable feedback.!
THUMP: 3-way select switch for power amp control of low frequency interaction
between amplifier and speakers.!
MASTER: Outer concentric is for CLEAN, inner concentric is for OD1 & OD2.!
STANDBY: Pre-heat for tubes, down engages the amp to operate. !
POWER: Down position engages the mains to the amplifier.!
INDICATOR: NOS Avionics light with adjustable brightness by turning the bezel.!
Cali rear panel overview (right to left)
MAINS: Input to connect wall power. !
VOLTAGE: Switchable between 120VAC and 240VAC operation. !
MAINS FUSE: T2A fuse for 120VAC, T1A fuse for 240VAC. !
HT FUSE: T.500mA fuse for high voltage. !
BIAS 1 & BIAS 2: on the back panel allows you to set the bias of output tubes. It is
currently set to 32mV per tube. Use a Digital Multimeter. When changing tubes, always
start by turning the BIAS 1 and BIAS 2 pots fully counter-clockwise, a speaker load
connected, and MASTERs set to zero. As you turn the BIAS 1 and BIAS 2 pots
SLOWLY clockwise, the tubes with starting drawing current. Jump back and forth
between the two output tubes and bring them up together. !
OUTPUT: Selects the output impedance to match your speaker cabinet 16/8/4 ohms.!
SPEAKER: Jacks to connect your cabinet. Jacks are wired in parallel.!
RETURN: Series effects loop return.!
SEND: Series effects loop send, instrument level. !
FOOTSWITCH: Connect 1/4” TRS footswitch for control of the 3 channels. First button
switches between CLEAN & OD2, Second button engages OD1. For remote switching,
here is the truth table: OD1 = tip open, ring open, OD2 = tip open, ring short to ground,
CLEAN = tip shorted to ground, ring open.!
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