TubeDepot Tweed 5F1 Assembly Manual Download Page 19

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Installing and Wiring the Fuse Holder

Step 1

– Remove the nut from the fuse holder and insert the fuse holder into the appropriate

chassis opening. The rubber gasket goes on the outside of the chassis.

Step 2

– Reinstall the threaded nut on the fuse holder and tighten it against the chassis. Lock

the nut down by painting the exposed threads with fingernail polish.

Step 3

– Locate the “HOT” wire of the AC power cord (the black wire in the USA). Solder this

wire to the end of the fuse holder.

Step 4

– Cut a 5” piece of 18awg black wire. Strip and tin each end.

Step 5

– Solder one end of this wire to the remaining solder terminal

of the fuse holder.

Step 6

– Solder the other end of this wire to the bottom solder

terminal of the rear mounted switch on the back of the volume
potentiometer (photo 6.13a).

Proceed to 6.14

Wiring the Power Switch and AC ground

Step 1

– Locate the appropriate power transformer's wire #1 primary

wires (solid brown and black wires twisted together) and solder these to the top solder
terminal of the rear mounted switch on the back of the volume potentiometer (photo 6.13a).
This is the white wire in the USA.

Step 2

– Locate the “NEUTRAL” wire of the AC power cord (the white wire in the USA).

Step 3

- Strip and tin the end of this wire.

Step 4

– Locate the solid black wire and solid brown wire from the power transformer and

strip and tin the end then twist these wires together.

Step 5

– Wrap the end of the “NEUTRAL” wire from the AC power cord with the end of the

black wire from the power transformer and solder together.

Step 6

– Fully insulate this connection with either a wire nut or with heat shrink (preferred).

Step 7

– Solder the green wire from the AC power cord to the solder terminal mounted to the

power transformer nearest the rectifier tube socket (photo 6.16a).

Proceed to 6.15

6.13

By wiring the fuse holder as recommended, shock hazards are reduced when changing the
fuse because the source AC is at the far end of the fuse holder and not at the cap end.

WARNING

The original amp had a .05 ufd cap between the fuse holder and ground. Commonly referred
to as the “safety” cap, this cap can be eliminated when using a 3 wire grounded power cord
instead of a 2 wire power cord. The grounding wire of the power cord is connected to chassis
and thereby providing the safe reference to ground instead of the old .05ufd cap.

NOTE

6.14

Photo 6.13a

It is important to choose the correct primary wires based on the mains voltage appropriate
for your location in the world. Incorrect wiring can lead to power transformer damage and/or
fire hazards.

CAUTION

The correct wire choices as per the mains voltages are as follows:

If your mainsthen the wires to use are ...

voltage is ...

wire #1 (to power switch)

wire #2 (twisted to AC pwr cord))

100

black with blue stripe

black

117/120

white

black