8 channel class A Aleph amplifier by Aaron Boumans

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8 channel class A Aleph amplifier

It is an 8-channel class-A pass-aleph amp with 4 Aleph 30’s and 4 Aleph 60’s


Amp was made mostly from scap an secondhand parts and was completely done for 900-1000euro’s

  • 4 transformers: 4x500VA and 2x 630VA
  • 1,3F (1.300.000uF)capacitors

This is my extention from active-stereo to active 5.0 so 4 amps for mid (3way with double woofer) and 2×2 for rear speakers.
Dimensions are 96 x 50 x 51cm and weight 100kg
This new amp is an addition to my current stereo system; also an active class-a aleph system.
It will drive the 3-way(double woofer) mid-channel and the two rear 2-way-channels

“Mighty beast… weights mere 1/10of ton!”

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

Of paint-stripped harting socket and connector part, I also milled them (nice, decent sized milling machine with all accessories!). The two hinge eyes and closes thread of the protective flap cut away and the big thick mounting eyes peeled off (otherwise it would not vertically fit on the base frame (150mm high). I must still be inside some extra threaded fitting for mounting. The cast texts removed.
8 channel class A Aleph amplifier

Inputs and outputs
8 channel class A Aleph amplifier

Harting Han48E chassis before and after.
8 channel class A Aleph amplifier

8 channel class A Aleph amplifier 2

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

as transformers and capacitors put it, is a very tight box!
8 channel class A Aleph amplifier

A large part of the wiring is in it, tomorrow the two plateaus on the studs screws and then showing the other 16 (of 24) x47000uF 8 x22000uF with the 16 R0, 15/25W (aluminum resistors with thermal paste, not necessarily needed but nicely) wired to the output. All masses of input and output on central earthing points. Wires little bundle / neatly explain (difficult with 2.5 to 4mm2, very stiff despite the braided wire)
8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

Picture of “false floor” with the capacitors. Other hand also as one. Is still shoddy work with all wiring. Probably need an additional aluminum plate mounted somewhere to eight major resistance to lose.
8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

well stocked cupboard …
8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

Got some 10mm thick aluminum plates arranged (remnants stove factory) and they now go to edit the cooling blocks to mount . So fitting & measuring, drilling and marking, sawing and milling!
8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

Holes drilled and tapped and construction tested for fit and weight but everything is perfect.
Now I can go the PCB mounted on the heatsink.
picture with a CD (falls a little way in the picture but stands on top) out how things can be estimated.
weight estimated at 100kg but maybe I’m exaggerating, it will weigh even
8 channel class A Aleph amplifier

PCB’s for the eight amplifiers
8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

8 channel class A Aleph amplifier

About author of article:

Aaron Boumans is coming from Deventer in Netherlands and he build this amazing amp.
You can send him a private message: aaronboumans of DiyAudio.com (you might need to register)
 
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