25W 6600 Ohms Ultra Linear Push Pull Output transformer

£79.41£97.93

SKU: PWPP25W6K6 Categories: , , Tag:
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Description

This transformer is the culmination of many weeks work to produce an output transformer for the Mullard 5-20 amplifier using EL34 output valves. I wanted something that would give me plenty of bass, down past 20Hz, and perform at the top end past 20KHz.

I have settled on this design as the analysis showed excellent results, giving a flat response less than 20Hz and, due to the winding methodology used, over 30KHz.

May be used in any push-pull design where an anode to anode impedance is 6600 Ohms.

Primary

Multi section winding, for reduced leakage inductance.
6600 Ohms Anode to anode
40% UL taps

Inductance

Inductance approx 50H.
Leakage inductance 16mH

Bandwidth

Wide bandwidth, 20-30KHz. (-1dB)

Secondary

Output impedance 4,8 and 16 Ohms.

Steel

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.

Connecting wire – stand up only

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

Mounting

Stand up, Drop through and frame.

Weight

2Kg

Additional information

Weight 2.3 kg
Mounting style

Stand up, Drop through, Frame

Output Impedance

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

Dimensions

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

shroud_with_feet.pdf
frame.pdf
drop_through.pdf

Shroud With Feet Drawing Key

Label Description Dimension (mm)
A Width 79
B Height 98
C Depth 86
D Mounting depth 51
E Mounting width 64
F Hole width 5

Frame Drawing Key

Label Description Dimension (mm)
A Width 98
B Height 83
C Depth 60
D Mounting height 64
E Mounting width 64
F Mounting depth 48
G Overall depth 70
H Mounting hole width 5

Drop through Drawing Key

Label Description Dimension (mm)
A Width 79
B Length 95
C Height 60
D Cutout width 48
E Cutout length 64
F Fixing length 79
G Fixing width 64
H Mounting hole diameter 4