Portaphile Nokito: The Micro NOK
Three Channel Amplifier Design using Jung’s Multi-loop topology
Components soldered using Cardas Solder
2xOPA627AM (L&R), 1xOPA627AU(G), 6xBUF634
Single Replaceable 3.7V Lithium ION Battery Rated for 500 charges
3.7V Voltage Boost increases Voltage to >18Vp-p
Dual Gain Settings (Low of 2 (low impedance headphones), High of 7 (Hi Impedance Headphones)
Dual Volume Settings (Low and Maximum)
Operating time of 4 hours between charges
Charges in 2.5 Hours using included Charger
In Package: Amplifier, Mini USB Charge Cable, 2A USB Power Adapter
NOTE: If you ordered prior to 12/13/2018 then your amplifier will ship out by 12/23/2018. Orders placed on or after 12/13/2018 will ship after 1/20/2019. I apologize for the delay but the company that supplies my cases is closed for the holidays and won’t ship out until next month. Discounted pricing will be good through the rest of December and the sale will end on 12/31/2018.
The Portaphile Nokito is the micro version of our now discontinued NOK. The Nokito uses a three channel amplifier design just like in the NOK and the 627 line. It uses two BUF634s per channel for a total of 6 buffers. The left and right channels use the CAN version of the OPA627 and the ground channel uses the SOIC version of the OPA627. It is a three channel, active ground channel design just like the rest of amplifiers I build.
It does NOT have a volume potentiometer like my other amplifier designs and instead uses a two stage stepped attenuator giving you two fixed volume settings. The benefit to this is that instead of your source signal passing through a volume potentiometer that colors the sound it will only pass through two high end Texas Components TX2575 Naked Z-Foil resistors per channel. TX2575 Naked Z-Foils are the best resistors for audio since they are regarded as being the closest thing you can get to a straight wire with no coloration. The result is hearing your music in it’s orginal form. You control volume from your source when using this audio amplifier.
The Nokito also uses Naked Z-Foils throughout the amplification stage. Please see the pic of the amplifier circuit. All those lines just above the battery, next to the two switches, and next to the CAN opamps are TX2575 Naked Z-Foils! These resistors were designed specifically for audio applications and are considered to be the most neutral resistor ever created. Please do a google search to see what others have said about these incredible resistors.
Regular price will be 799.00 with December sale pricing of 699.99 and there will be a 10% discount for head-fiers on the first 10 orders. Just use the coupon code “headfi” when checking out and send me your head-fi name with your order. If you’re not a head-fi member yet just go over to head-fi.org and sign up before ordering. Please email me if you have any questions or comments. Look forward to hearing from you and happy listening!