EL84 Push-Pull 10W Output transformer 6600 Ohms 20% UL taps (Mullard 5-10)


EL84 10W Output transformer – Mullard 5-10 etc

Datasheet available here Datasheet

For the superior 8000 Ohms 43% Ultra linear tap transformer visit:
8000 Ohms 43% UL taps Mullard 5-10 Output transformer

Earn up to 113 Points.

5% discount on 2 or more


A high quality 10W at 20Hz Push pull ultra linear output transformer. Designed for the Mullard 5-10 amplifier but may be used in any single ended design with a valve having an output impedance of 6600 Ohms anode to anode, such as an EL84.


Multi section winding, for reduced leakage inductance.


Inductance 35H at 25Hz.
Leakage inductance 6mH


Wide bandwidth, 10-50KHz. (-1dB)


Output impedance 4,8 and 16 Ohms.


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.
Layer wound for excellent wind consistency and alignment resulting in reduced leakage inductance.

Connecting wire – stand up only

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


Frame, Drop through or stand up versions, all with flying leads.



Additional information

Weight 1.6 kg
Mounting type

Stand up, Drop through, Frame

Output Impedance

4, 8 & 16 Ohms, 4 Ohms, 8 Ohms, 16 Ohms


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 64
B Height 78
C Depth 83
D Mounting depth 48
E Mounting width 57
F Hole width 5

Frame Drawing Key

Label Description Dimension (mm)
A Width 79
B Height 67
C Depth 70
D Mounting height 54
E Mounting width 54
F Mounting depth 54
G Overall depth 70
H Mounting hole width 5

Drop through Drawing Key

Label Description Dimension (mm)
A Width 64
B Length 76
C Height 60
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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