My first amp.
Yet another Beta 22.
The wiring took me much longer that I thought to complete. If you wonder what's with those wiring, the inner left rotary switch is the usual input selector. The left most rotary switch is a bypass output selector, so this box also can serve as a input switch box for other headphone amp or preamp, eliminating the need for RCA splitter when using the same sources for multiple headphone amp / preamp. The right rotary switch is the line level output selector, it chooses to output from the internal amp boards or from other preamp/receiver. So this is also an input switch box for the power amp.
Completed main enclosure.
Transformer enclosure. I added a fuse holder after the photo. If you notice there are extra holes, switch and space. Those are for my planned second amp, the SOHA II. This enclosure also serves as a mains filter for my sources, hence the IEC outlet (will be shown in later photo).
Back of the enclosures. You might not see it from this angle, but the alignment of the RCA jacks is atrocious, I haven't handled a drill in a while. I also cheated and used a male cable mounted speakon as the transformer inlet. I don't have any means to cut a square hole. This is where it showed that I am new at this.
In the stack. The LED indicator behind the volume knob is much dimmer in person. I shouldn't have used diffused LEDs. the colour of the LED also doesn't match with the rest of the LED (440 vs 460 nm). Fortunately it looks decent enough from the front without any major flaw, considering my relative ineptitude in case work.
The transformer enclosure, with the non-functioning (yet) switch at the right.
The stacks. A new DAC (Rega DAC) is coming in, to be placed on top of the right stack. The upcoming SOHA II will be on top of the left stack. The SOHA II will use an enclosure having identical foot print and look to the power supply enclosure, but taller. I got the details all planned.
I actually got the enclosure, knobs and switches ahead of the innards.
Another angle. I also built the wooden spacers for heat dissipation on top of the Beta 22 and the speaker power amp. They can get a little warm. The Beta 22, and the upcoming SOHA II will be used mostly as preamp for my speaker setup. I only listen to headphones when it is late at night these days.
Thanks for looking.
