At your risk. Take all safety precautions. A suitable fuse must be in serries with any battery for injury or fire hazard protection.
Today the 2SK951 MOSFET was placed on the big heatsink.
Vb=12V. Output transformer bifilar 1:1 with air gap.
Signal path:
music on CD - SONY D-EJ758CK CD Walkman line out - Pleiades K951 - Marantz Imperial 5-G
It sounded not loud, and when the 1K pot was near maximum the sound started to fade out.
Fortunately before abandoning, on a quick decisive move the Wago connector was opened and the signal was sent bypassing the volume pot directly to the gate terminal through the 560K Philips orange coupling capacitor.
Sound became big and loud indicating a broken potentiometer.
The amplifier sounds very nice with deep bass and extended treble, smooth midrange. Some overload at peaks as the full signal is feeding the gate without attenuation.
Id is 500mA at Vd 12V. So power dissipation 6W. Possible power output 3 Watts?
It seems a suitable MOSFET can do the trick without the need of a step up input transformer.
But the electron tube Pleiades DL94 seems to sound better.
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