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10 On/Bypass button
– Selects between true bypass and whichever channel has
been selected by the Channel button.
11 Active/Bypass status indicator
– When lit, it indicates that the Twin Tube Blue
is engaged and operational. When dark, it indicates that the unit is in bypass mode
and that the guitar signal is passing straight through unaltered.
Explanation of Controls
Back Panel
1 Input Jack
– Plug your guitar in here
2 Output Jack
– Provides the output signal. Connect to the input of a guitar amp,
power amp or other device here.
3 Power Jack
– This is where you connect the provided wall-mounted power supply
(“wall wart”) to the Twin Tube Blue. Note: it is a 16 VAC/600mA unit. Do not try to
substitute a DC power supply or another AC supply with a different voltage value
or current rating. If you lose your transformer or if it breaks, contact an authorized
Seymour Duncan dealer for a replacement. As an alternative, for North America and
Japan, you can order a 16 VAC/600mA transformer from Digi-Key (www.digikey.
com). The part numbers for each common voltage is as follows:
North America:
120 Volt/60Hz – Digi-Key part # MT7123-ND
Europe and Asia:
230 Volt/50Hz – Seymour Duncan part # 352301-230 (no
known off-the-shelf replacements available)
Japan Only:
100 Volt/50Hz – Digi-Key part # MT7127-ND (note: this
transformer is rated by the manufacturer as 20 Volt/450mA output with 120 Volt
input, but will produce the proper output voltage and current when coupled to a
100 Volt mains supply)
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