Description
This transformer is the culmination of many weeks of 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 20 AWG UL1015
Mounting
Stand up, Drop through and frame.
Weight
2Kg
shroud_with_feet.pdf
