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■About This Items■
This modification incorporates a circuit that boosts the voltage from 2.5 volts to 7.5 volts using an LM317L transistor at the point where 9 volts DC would normally supply power to an operational amplifier.
The voltage can be changed from 2.5 volts to 7.5 volts by turning an additional knob on the side.
At around 5.5 volts, the tone of the SD-1 changes to a rough FUZZ-like sound.
The JRC4558D on-board op-amp was the best match, so we used it as is.
Since the voltage supplied only to the op-amps is only stepped down, the buffer circuits installed before and after the op-amps are modified so that the buffer circuits are supplied with the normal 9 volts of current.
We plugged in the guitar and got sound.
Tested.It works fine with 9V power adapter or 9V battery.
It made in Taiwan 2003 and Modified in Japan 2025.
LED color changed from red to white.
The rubber ring of the pedal guide bushing was replaced with a new one.
■Appearance■
Slightly peeling paint in some areas.
Please have a look at the photos.
■Condition■
Used & Modify.
■Included Items■
Nothing(Main Unit Only).
Not include Adapter.
■Shipping policy
↑For more information about our shipping policy, please refer to this link.
Please be sure to check before purchasing.
