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Founder of XSA-Labs
Joined 2012
Paid Member
ALPHA 52W Class A

The new ALPHA 52W "Big Boy" (BB) PCB has been verified to work and it sounds fantastic. Runs super cool and quiet with CPU coolers. This is the only way to cool a 220w (per channel) idle dissipation amp. Design is for +/-36v rails at 3amps for 52w into 8ohms. An over-the-top amp that is easy to build and start-up. No adjustments of any kind with rock-stable bias and 0mV DC offset. Pure SE Class A operation and no unobtanium parts required.

Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier

MOSFET bodies run cool at 37C and heatsink fins at 30C. No sign of "heat' that is too hot to touch anywhere.

672472d1522616478-aksa-lender-mos-hybrid-aleph-alpha-amplifier-alpha-bb-test-mono-fast-closeup-jpg


CPU cooler heatpipes - these are PWM fan control motors with separate controller with temp sensor:
672228d1522512850-aksa-lender-mos-hybrid-aleph-alpha-amplifier-alpha-bb-build-hs-mounting-02-jpg


Before installation of MOSFETs:
671993d1522394737-aksa-lender-mos-hybrid-aleph-alpha-amplifier-bb-build-01-jpg


No matching of output devices, each amp uses one IXTK88N30P 88amp n-channel and IXTK90P20P -90amp P-channel MOSFET.
672227d1522512850-aksa-lender-mos-hybrid-aleph-alpha-amplifier-alpha-bb-build-hs-mounting-01-jpg


Test case with +/-27.6v rails achieves 33wrms into 8ohms:
672327d1522552973-aksa-lender-mos-hybrid-aleph-alpha-amplifier-alpha-bb-sound-oscope-02-jpg
 
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Founder of XSA-Labs
Joined 2012
Paid Member
Wow, what a lot of vias. Did the board house charge extra for that? I guess these days they’re probably laser cut so it wouldn’t tie up the machinery for too long and wear out too many drill bits.

Surprisngly, no. I know that it took them 5hrs to drill the holes for 10 boards. Usually the drill step goes faster. The vias create a porous metal foam like conductor that carries a lot of current. Also prevents peel off. The boards actually weigh more with all the plated metal in the vias vs a non-drilled board.
 
Very well done PCB and thermal solution, congratulations. This metallic vias are done without any overprice in China, where 10x10cm PCB cost 20 cents. I have another question. Is it worth to force only one parameter of quality, passing thru 0V with such as huge bias? What is about fastness (min. 200V/microsec), lowering dumping factor (250 or more), linearization from 0Hz to 200 kHz and totally symmetrical scheme in front off classic? I am going this way last 30 years.