IC: 3-channel active ground DIY Beta22
Will Ship To: CONUS
I've been more into electrostats than dynamics lately, so I'm looking to see what I can get for my Beta22 and put the funds towards a nice stat amp. It's enclosed in a single Nabu chassis, with a metal divider between the transformer and the rest of the circuitry. The transformer has a soft hum, but thats on the physical transformer itself, I cannot hear it through the headphones so I think the transformer is shielded properly from the rest of the circuitry. Note that this is a very soft hum... I can't hear it with music playing, and I can only hear it without headphones on in a quiet room. I tried putting dynamat between the transformer and the retention brackets, which helped but did not completely alleviate the noise. I believe it's from the coils within the transformer.
I purchased kits from Glass Jar Audio, so the parts are all good quality. There is a fused IEC on the back panel, along with speaker taps and RCA inputs. Single locking Neutrik 1/4" jack on the front, along with a switch to select between speaker taps and headphone out. This comes in handy when disconnecting headphones because you are not supposed to disconnect TRS plugs on these amps with power going to the headphone jack. The volume pot is an Alps Blue Velvet.
Another thing to note is the resistors for the LEDs are not dialed in properly, so I believe the LEDs are driven too hard. I had one burn out many months ago, which I replaced. Right now they all still appear working, but I seem to remember one of them goes in and out. This does NOT affect the performance of the amp, just a cosmetic issue. I never bothered to really fix it and solder in some extra resistors because the amp isn't the prettiest thing in the first place. Kind of a modern industrial look I suppose.
Send me some offers:) Open to trades as well, especially for electrostatic amps. I would much prefer to keep this within the US given the weight of this thing.