FS: 12AU7 Starving Student Millett Hybrid (SSMH) headphone amplifier with built-in GrubDAC (USB)
Will Ship To: CONUS
I'm putting my beloved SSMH up for sale. I spent a good month or so making sure this DIY amplifier turned out as best as I could possibly do, and I think I did a pretty good job if I do say so myself. It's served me well for the past nine months, providing tons of power and a good representation of both tube euphonics and solid-state detail. The only reason I'm putting it up for sale is because I just received a Millet Hybrid MiniMAX, along with a Music Streamer II, and I can't use two amplifiers at once, so one of the setups has to go.
There's one stipulation I must require when I sell this amp to you, and that is that I must be able to track the location of this amplifier once it is out of my hands. In other words, I want to know if it gets sold to someone else. I have an unnatural attachment to any of my DIY creations, and this one is above all nearest and dearest to my heart, so I would like to know the status of the amplifier, as I would like to be able to reacquire it in the future.
There is one minor issue with this amplifier, and that is that the gain is a little high for typical usage. Most especially, low impedance headphones (basically anything under 80 ohms, or IEM-like sensitivity) will hiss at any volume level. This may be fixable by cutting out the cathode bypass capacitors (C7/C8 on the SSMH schematic). Some have suggested this as a possible gain fix; I haven't done it due to lack of time and the fact that most of my main headphones are either very low sensitivity (AKGs) or high impedance (Beyers, Sennheisers). They perform incredibly well with the 300 and 600ohm headphones I've had, and can even drive the HE6 to listenable volume at noisy ambient noise levels (i.e. head-fi meet conditions).
I will be including the amplifier, Cisco power supply, and an extra set of tubes (two total). You will require either RCA cables for your own source (as I have an input selector switching between the GrubDAC and an RCA input) or a USB for the Grub.
As for price, I paid around $200 for all the parts (yeah, no longer "starving student", I know...), and put countless hours of work into planning the layout, air-wiring the parts together, troubleshooting, designing the panels, drilling the panels and doing the laser engraving myself. Due to the hiss issue I'd like to get back at least $160 plus shipping to the CONUS, or best offer. Please send me a PM if you're interested, thanks!
More pictures can be found here:
Nichicon KW bypassed with Wima MKP output caps
Wima MKP interstage caps
National Electric/Pro-Comm matched 5814A tubes (somewhat generic)
LED diode protection at the output, for turn-on/off DC offset
Edited by Ikarios - 5/26/11 at 9:21pm