Son of Zen amplifier

**rendoman** · Apr 13, 2017, 07:26 PM

Hi all!
New project
It's a mosfet amplifier, class A , balanced, with no feedback and no capacitors on signal path. It's an old project of mr Pass

http://www.firstwatt.com/pdf/art_soz.pdf

Price for these specs is the Efficiency, it is close to a grill or an heater

I decided to try this amp after a good find from scrap yard, two big heatsink in very good condition, a rare beast to find!
I bought very nice matched mosfet, IRFP 240 - vishay. Power resistor are rated 50w , 1% , circuit is mounted directly on heatsink.
Power supply unit is a little beast, 120000uF capacitors array, dual, combined with 2mh air-core chokes. Coils bobbins are made in nylon loaded with molybdenum disulfide, 1,32mm copper wire. I want to use the green polizene panel to keep capacitors in position, like in plasma tweeter project, it's Always useful to have a stand alone power supply unit, imho.

I'm trying to focus on the frame, it's a bit hard to choose a position for the black granade. I found a good front panel, want to make an high pressure porthole style in the front.

I want to set output power max 5w, since I don't need more than 1w for main horns, it can be nice to test the amp with different speakers
Saluti
Stefano

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