R E A R PA N E L
25 23
27
24
22
CAUTION
FUSE
26
(22)EFFECTS SEND LEVEL
This calibrated (0 – 10) control sets the level of signal being sent to external effects and/or signal processors. Clockwise rotation increases the amount of signal being sent; counterclockwise rotation decreases the amount. For the quietest operation, the EFFECTS SEND LEVEL should be set as high as possible. Generally, the SEND and RETURN levels should be set in opposite proportions. If the EFFECTS SEND LEVEL is set low, the EFFECTS RETURN LEVEL (24) should be set high to achieve unity gain.
Note: The effects loop may also be used as a footswitchable volume boost by turning both controls to higher settings.
(23/24) EFFECTS SEND/EFFECTS RETURN
These 1/4" mono (TS) jacks allow signal to be sent to and returned from external effects and/or signal processors. Using shielded cables with 1/4" mono (TS) phone plugs, patch from EFFECTS SEND to the input of the external device and from the output of the external device to EFFECTS RETURN. Only devices that do not increase signal gain should be used in this effects loop (chorus, delay, reverb, etc.). If the footswitch is used, the EFFECTS SELECTOR (39) switch must be depressed to activate the effects loop. See the FOOTSWITCH section of this manual for explanation of switch operation.
(25)EFFECTS RETURN LEVEL
This calibrated (0 – 10) control sets the level of signal being returned from external effects and/or signal processors. Clockwise rotation increases the amount of signal being returned; counterclockwise rotation decreases the amount. Again, SEND and RETURN levels should be set in opposite proportions, with the SEND level being high and the RETURN level low to ensure the quietest operation.
(26)REMOTE SWITCH
This
(27)BIAS TEST TERMINALS
These terminals are provided to measure the bias voltage of the amplifier’s power tubes. A knob behind the back panel grille allows for adjustment. Bias adjustment should only be done by a qualified
technician.
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