I have two sets available of SiCphones amp, Welborne Labs linear power supply, and an AC power inlet module.
$325.00 per set (also includes the as originally supplied power supply), plus shipping for 11 pounds per set, from ZIP 18661.
Here is the Kickstarter offering
https://www.kickstarter.com/projects/1682246865/sicphones-a-high-end-silicon-carbide-headphone-ampThere are discussions and other information available by web searching. Here is my journey:
The offering seemed interesting to me, even when the original output device had to be changed to a MOSFET. I purchased two units, assembled and tested. I wanted to burn in the two amps at the same rate, one with low impedance [62 ohm AKG K702] and one with high impedance [600 ohm Beyerdynmamic Tesla T1] headphones. Impedance did not seem to be an operational issue. After 100 hours of operation on each, I was generally satisfied with the sound, but I thought that there was both some lack of dynamics and also a slight haze on the sound. I purchased two assembled and tested linear power supplies from Welborne Labs, another small American company now out of business. Now, the sound had better dynamics, and the haze was gone.
There is a feature of this amp, and also of many other small electronic devices, that have external power supplies: the power switch on the device breaks the secondary side of the power supply, which is what causes the significant POP at both turnon and turnoff of these devices. I have added another small box to the stack. This one contains an AC power entry module from Schaffner. It provides an IEC input, DPST switch, two fuses, and a filter. I taped the power switch on the SiCphones amps in the ON position, and power is now switched from the one on the Schaffner module. Now, no noises at turnon or turnoff, and likely less strain on the amps and the connected headphones.
I had purchased both of the SiCphones amps at the same time, both assembled and tested, and they sent along one complete assembly manual with the order. Whoever purchases one of these from me first gets that manual, the second purchaser gets a few photocopied pages, most importantly including the procedure to test and adjust the bias. I recently tested the bias of both channels of both amps, and they were still within specification.
