Specifications

Dual Primary Power Transformer Installation Instructions.
Choose the installation appropriate for your mains supply
voltage (120V or 240V).
Wiring the Power Transformer for 120V Mains
Step 1 – From the power transformer, locate the white wire and the white with black stripe
wire. Twist the length of these two wires together and strip the ends of both.
Step 2 – Strip the end of the “NEUTRAL” wire of the AC power cord (white wire in the USA).
Step 3 – Twist the stripped ends of the above three wires together and solder. Cap the end of
these twisted wires with either a wire nut or heat shrink. Make sure that no bare wire is
showing.
Step 4 – From the power transformer, locate the black wire and the black with white stripe
wire. Twist the length of these two wires together.
Step 5 – Neatly run the black and black with white stripe twisted wires over to the power
switch and cut to length. Strip the ends of both wires.
Step 6 – Insert these stripped wire ends into the open terminal of the power switch and
solder.
Step 7 – Cover the end of unused red with blue stripe wire with heat shrink or electrical tape.
Step 8 – Neatly arrange all wires close to the chassis (see drawing 6.30a on following page).
Proceed to Chapter 7
Wiring the Power Transformer for 240V Mains
Step 1 – From the power transformer, locate and strip the end of the white wire.
Step 2 – Strip the end of the “NEUTRAL” wire of the AC power cord.
Step 3 – Twist the ends of the above two wires together and solder. Cap the end of these
twisted wires with either a wire nut or heat shrink. Make sure that no bare wire is showing.
Step 4 – From the power transformer, locate the black wire and the white with black stripe
wire. Twist the length of these two wires together. Strip the ends of both wires.
Step 5 – Twist the stripped ends of the black wire and white with black stripe wires together
and solder. Cap the end of these twisted wires with either a wire nut or heat shrink. Make
sure that no bare wire is showing.
Step 6 – From the power transformer, locate the black with white stripe wire.
Step 7 – Neatly run this wire to the power switch and cut to length. Strip the end of this wire.
Step 8 – Insert the stripped wire end into the open terminal of the power switch and solder.
Step 9 – Cover the end of unused red with blue stripe wire with heat shrink or electrical tape.
Step 10 – Neatly arrange all wires close to the chassis (see drawing 6.30b on following
page).
Proceed to Chapter 7
26 TubeDepot.com
6.30a
It is important to choose the correct primary wires based on the mains voltage appropriate
to your location in the world. Incorrect wiring can lead to power transformer damage and/or
fire hazards. The following instructions are for wiring the dual primary transformer for 120V
mains. Instructions for 240V mains is in the following section (6.30b).
CAUTION
6.30b
CAUTION
It is important to choose the correct primary wires based on the mains voltage appropriate
to your location in the world. Incorrect wiring can lead to power transformer damage and/or
fire hazards. The following instructions are for wiring the dual primary transformer for 240V
mains. Instructions for 120V mains is in the previous section (6.30a).