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RETURN (REVERB) controls the amount of signal from the three-tube reverb circuit as blended back into the preamp circuit.
The RETURN control will generally increase the prominence of the reverb signal compared to the dry signal. Turning the
REVERB control clockwise will make the reverb sound louder compared to the dry signal, creating a more wet, effected sound.
MASTER sets the overall volume of your amplifier.
CONTOUR is an active high frequency control WITHOUT using negative feedback. This is a more effective control than a
traditional presence control. At noon, the power amp is essentially flat. Counter clockwise reduces high frequencies, as well as
increases bass response. Clockwise increases high frequencies. Use this control to add sparkle and clarity to your tone.
ON / OFF (POWER) two-way toggle switch powers the Joyful Music! on and off. With the toggle switch in the UP position, the
JM is ON. In the DOWN position, the JM is OFF.
OPERATE / STANDBY applies high voltage to the vacuum tube anodes (and screen grids) during use of the JM. To ensure
long tube life, first power the unit on with the toggle switch in STANDBY position for approximately 30 seconds. Then switch to
OPERATE to use the JM. With the toggle switch in the UP position, the Joyful Music! is in OPERATE mode. In the DOWN
position, the Joyful Music! is in STANDBY mode.
INDICATOR will illuminate when the JM is powered by turning the rear panel MAINS toggle switch to the ON position. If
INDICATOR does not turn on, check your power cable connections, and then the fuses on the rear of the unit.
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