Sale: Sold as Pair for price of single board. 2oz copper, 2mm thick, ENIG finish PCBs. Provides a complete amp solution including PSU and SSR speaker protect.

This is the ALPHA Big Boy with Buttah (ABBB) Class A Amplifier PCB. This amp is the evolution of the Alpha BB amp but combined with the popular Smooth Like Buttah (SLB) active bridge cap multiplier power supply all integrated on board. The amp uses the wonderful Aksa Lender front end with the superb hybrid P channel Aleph output stage. In combining the Alpha BB with the SLB we have essentially simplified one of the most time consuming and difficult aspects of building a Class A amp: making the power supply and connecting it. We have also decided to include a custom solid state relay (SSR) speaker protection and delayed start circuit designed by jhofland. The SSR protection is new and has been tested on P2P veroboard. Beautiful professional layout by JPS64 and includes over 16,000 vias that stitch the top and bottom copper planes together for a lower impedance path for electric current. Boards will be 2mm thick with 2oz copper and gold ENIG finish.

Notable features of the ABBB amplifier:
- All in-one amplifier board
- 52w into 8ohms
- Remotely mounted power transistors with Molex quick disconnects
- 400VA to 500VA 32v power transformer (per channel) with dual secondaries is recommend to achiev about +/-37v rails
- Designed to be used with cost effective CPU coolers
- Built in ground loop breaker using NTC and 22nF cap
- Bias current is circa 3 amps

This is about as close as we can come to a single-board Class A power amp. All that is required is to connect the transformer secondaries (4 spade FASTONs), connect speaker +ve and +ve (2 spade FASTONs), audio input (2pin JST), and chassis GND (1 spade FASTON).

Of course, the 2 TO-264 BJTs for the cap multiplier need to be connected to a heatsink capable of removing about 10W to 15W each. The two TO-264 IXYS MOSFETs need to be connected to suitable heatsink or CPU cooler capable of removing about 100W. Note that many CPU coolers have a large enough pad to accommodate both BJT as. MOSFET size by side. We recommend Noctua PWM fans for silent operation.

The nice thing about mounting the actives to the heatsinks is that they are on flying leads with 4pin polarized Molex connector. So the amp board installation and actives heatsink installation are separate operations. And you can pull the amp board out of the chassis without removing the transistors from their heatsinks! How convenient is that?! We tested this on the SLB ans another one of Hugh’s amps and found that it works superbly. Very convenient.

The addition of an on-board DC protection circuit and power on time delay will help to prevtndameg to the speaker and eliminate turn on thump. It is a small and unobtrusive circuit near the output FASTON terminal.

Sale: sold as a pair for price of single. 2mm thick, 2oz copper ENIG finish. very large heavy boards.

More info here: https://www.diyaudio.com/forums/group-buys/339086-alpha-boy-buttah-abbb-52w-class-amp-gb.html