Up for sale are PCB and active parts kits for the Classic Aleph amplifier. These are based on the famous Pass Labs Aleph amplifiers, and this project was blessed by Nelson Pass for a Group Buy on DIY Audio. These boards are left over from the recent DIYAudio Group Buy offering. The boards have been used to make the following:
Aleph 30 Stereo (30 Watts Per Channel - Class A into 8 Ohms)
Aleph 30 Monoblocks (30 Watts Per Channel - Class A into 8 Ohms)
Aleph 60 Monoblocks (60 Watts Per Channel - Class A into 8 Ohms)
Aleph 2 Monoblocks (100 Watts Per Channel - Class A into 8 Ohms)
The concept for this project was:
Build a Classic Aleph circuit on a PCB for DIYAudio Chassis UMS heatsinks
Make it Flexible / Expandable - the "Swiss Knife Aleph". Include the ability to add additional PCB(s) for more semis. Want an Aleph 3/30? How about a 5/60? Got enough heatsinks for an Aleph 2?
Detailed Bill of Materials, schematics, and build details are located in build guide documents. The build guide documents and "Builder's Thread" are located here:
https://www.diyaudio.com/community/threads/classic-aleph-amplifier-for-modern-ums-chassis-builders-thread.382316/
The boards are purple with 2oz copper and gold ENIG finish. The exception is the A/C Cap & CL-60 Board, which is HASL finish.
This kit can be used for either Aleph 2 or Aleph 60 monoblocks. The details are in the build documentation in the link above. In summary, the Aleph 2 monoblocks will use larger chassis, higher voltage and VA rated transformers, and some different caps and resistors. These PCBs and active devices are what is needed for either design. All details are in the build documentation.
Aleph 60 / 2 Monoblock Kit includes:
Qty. 2 - Classic Aleph Main PCBs
Qty. 2 - Aleph Expansion PCBs
Qty. 2 - V8 CRCRC Supply PCBs
Qty. 4 - Rectifier / Snubber PCBs
Qty. 2 - A/C Cap & CL-60 PCBs
Qty. 24 - Precision matched Vishay or Fairchild IRFP240 MOSFETs
Qty. 6 - Precision matched Harris/Fairchild SFP9610 MOSFETs
Qty. 4 - ZTX450 or 2N4401 NPN Transistors (Please refer to datasheets for pinouts)
I have additional listings for:
Aleph 30 Stereo and Monoblock Kits
NOTE: ZTX450's have been out of stock globally for roughly one year. The 2N4401 can take the place of the ZTX450. Please refer to datasheets for pinouts