Mains transformer Mullard 5-20 Mono


410V – 0 – 410V @ 180mA

6.3V @ 4A Centre tapped
6.3V @ 2.5A Centre tapped

5V @ 3A

Incorporated copper screen for electrostatic noise reduction, and safety.

Designed and tested to European standards.

Earn up to 161 Points.

5% discount on 2 or more


Designed to power a Mullard 5-20 Mono amplifier to the Mullard specification.
Proudly made in the United Kingdom


European primary voltages, 220V, 230V, 240V and 250V.


HT winding 410V – 0 – 410V at 180mA DC
Heater windings 6.3V at 4A centre tapped, 6.3V at 2.5A centre tapped.
Rectifier winding 5V at 3A


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

High quality PVC 600V
Primary and HT : 22AWG UL1015
Secondary LT : 20 AWG UL1015




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

Additional information

Weight 2.3 kg
Mounting type

Stand up


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 98
B Height 117
C Depth 98
D Mounting depth 51
E Mounting width 89
F Hole width 5


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