The 627X is the result of everyone requesting a longer running Portaphile amplifier. To build the 627X, I took the same amplification circuitry of the 627 and MICRO amplifiers, added a bigger battery and went ahead and put in a bigger higher quality potentiometer. The 627X uses a high end TKD potentiometer. TKD is based in Japan and is the builder of some high end potentiometers. The latest 627X now offers USB charging as well.
Big brother to the MICRO, The Portaphile 627X is a single ended, three channel portable headphone amplifier based on the excellent Burr Brown OPA627 Difet opamp. Texas Instruments lists the application of the OPA627 for “High Performance Audio Circuitry” and that is exactly how I would define the Portaphile 627X, as a high performance headphone amplifier. The OPA627 is usually only used in the finest home audio gear, now you can take it with you where ever you go.
I mill the front and back panels in house. Each panel is milled out of a quarter inch solid block of aluminum and takes between 3 to 4 hours per panel. The milling work in each amplifier alone is about 6 to 7 hours. The panels are then shipped out to get Type 3 annodized in black. Type 3 is a hard surface that resist scratches. As you can see from the pics, all of the lettering is milled and isn’t silk screened on. The rest of the case has a nice powder coated finish that is friendly to stacking.
Get off the Grid by using a portable battery pack to charge your Micro or 627x!
Handcrafted 100% in the USA.
Please email me if you have any questions or comments, I will look forward to hearing from you!