Mullard 3-3 Mono Mains transformer 600V CT @ 80mA 2 x 6.3V @ 1A


300V – 0 – 300V at 80mA DC

2 x 6.3V at 1A.

Designed primarily for the  Mullard 3-3 amplifier.

Earn up to 90 Points.

10% discount on 2 or more


A superb quality mains transformer for any valve project. Originally designed to power a Mullard 3-3 Mono amplifier.
Proudly made in the United Kingdom


European primary voltages, 220V, 230V, 240V and 250V.
US primary voltage dual 120V.


HT winding 300V – 0 – 300V at 80mA DC
Heater winding 6.3V at 1A centre tapped.
Rectifier winding 6.3V at 1A


High quality Grain Orientated M6 0.35mm.
Hand laminated for the best stacking factor, and accuracy.

Winding wire

Double coated Grade 2 enamelled copper wire.
Wound using CNC winders for highly accurate wire placement and turns count.

Electrostatic Screen

Solid copper sheet providing the best RF screening possible between primary and secondaries.

Connecting wire – stand up only

High quality PVC 600V
Primary and HT : 24AWG UL1015
Secondary LT : 20 AWG UL1015




Built and tested to safety standard BS EN 61558-1 2005

Additional information

Weight N/A
Mounting type

Frame, Drop through, Stand up

Primary Voltage

European, US


Here are dimensional diagrams for this transformer.
Please refer to the relevant key below for the dimensions.


Shroud With Feet Drawing Key

Label Description Dimension (mm)
A Width 73
B Height 86
C Depth 79
D Mounting depth 51
E Mounting width 57
F Hole width 5

Frame Drawing Key

Label Description Dimension (mm)
A Width 73
B Height 86
C Depth 57
D Mounting height 57
E Mounting width 57
F Mounting depth 45
G Overall depth 62
H Mounting hole width 5

Drop through Drawing Key

Label Description Dimension (mm)
A Width 73
B Length 86
C Height 54
D Cutout width 58
E Cutout length 61
F Fixing length 64
G Fixing width 51
H Mounting hole diameter 4.1



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