627X – New Addition to the Portaphile Lineup

I am currently working on meeting the demand for a longer running amplifier.  The new amplifier will have a runtime between 8-10 hours.    The amplifier will require  a larger case.  The dimensions of the current 627 are 2.82 x 3.97 x .75.  The new longer running amplifier 627 will be 2.75 x 4  x 1.12.  As you can see, the biggest change will be to the height of  the amplifier.   My original goal was to get something out by the end of the year but now having found a potential battery to use I may have something by June or July of this year.   There are still lots of testing and fine tuning to be done but hopefully I can get something out sometime around then.  To help get something out sooner I may announce a pre-order discount sometime around early April so please keep an eye out on this website or email me through the link here to get on the list.  Expected sales price will be in the 550 to 600 range with a lower introductory sales price for those who wish to preorder.   The new amplifier will be known as the 627X.

19 Responses to “627X – New Addition to the Portaphile Lineup”

  1. Gidion February 5, 2013 at 3:37 am #

    That is great news. I always have had problems with battery failing midway the morning train ride:) Hope it can charge using Usb as well:)

    side note: please put me on the pre-order list. Cheers and keep up the good work.


  2. Eduardo February 11, 2013 at 9:10 pm #

    I’m from Brazil and, if possible (ship the 627x to São Paulo, Brazil), I’d like to be in pre-order list. Thanks

    • PortaphileAdmin February 11, 2013 at 10:27 pm #

      Yes, I can ship pretty much anywhere. I will add your email to the pre-pre-order list and let you know when the pre-ordering will be open. Should be in a month or two. I will be testing the first batch of boards this week and should get have a better time frame in the next week or two. Thanks for your interest!

  3. Robert Spellman February 12, 2013 at 9:12 pm #

    Please put me on the Portaphile 627X waiting list. Many thanks…Bob

  4. John February 15, 2013 at 8:47 am #

    Any changes to the amp section that might interest those of us already with the 627 and have no problems with the battery life? Will the amp run cooler in a larger case?

    Or possibly a 9V battery version down the road?

    • PortaphileAdmin February 15, 2013 at 3:12 pm #

      The amplifier should run cooler in the larger case with more area to dissipate heat. The amplifier section will remain unchanged as far as components go but I did need to “compact” the amplifier section to free up some board space to accommodate the larger battery. With the taller case, I am considering upgrading the potentiometer to a TDK (Tokyo Ko-on Denpa) 2CP-601 now that I have the room. The is the best potentiometer I can get in the still limited case space. Final pricing may be affected if the TDK is used.

      • John February 18, 2013 at 9:09 am #

        Thank you Cesar for the response.

        New potentiometer. If so then I might have to get on that pre-order list. People say the potentiometer is one of the most important parts to an amp so if you upgrade this part then I really would like to hear the 627 vs 627X.

        Also thanks for posting the impedance measurements. Definitely illustrates why the 627 sounds so good with my sensitive IEMs but also drives my full size headphones with authority.


  5. Robert Spellman February 18, 2013 at 4:44 pm #

    Hi Cesar, At this point, what is your best guess as to when you will start shipping the 627x? Also, if you make some small changes to the amp after early production, do you do the upgrades for free generally? Many thanks for your help and information, All the best, Bob

    • PortaphileAdmin February 18, 2013 at 5:19 pm #

      Hi Bob, I am hoping to get the amplifier ready by May and hopefully shipping by then. I don’t expect to have any upgrades after production for a while. I have looked at the current design and the only “upgrades” beneficial are changing the potentiometer and going with the larger capacity battery. My only concern at this time is the lead time on the new potentiometers which I have just been told is 60 days from now. This may or not cause on unforeseeable delay. I will post updates as they are available.

  6. Maki February 23, 2013 at 3:52 pm #

    I was about to buy the Portaphile627 old version long time ago, I did not care if it only had a 3 hour battery charge since I only listen to music for about 1 hour, but I was told that turning on or off produces a pop sound, so I decided no to buy it,since I did not want to plug and unplug my custom ciem every time I was going to use it, do you think you can address that issue in the new design?

  7. Arthur Watson April 1, 2013 at 9:38 pm #

    Hi from sunny Scotland.Please put me on the 627 x pre order list.Regards Arthur Watson.

    • PortaphileAdmin April 1, 2013 at 10:45 pm #

      Hi Arthur, the pre-ordering is closed as of 3/31/2013. If you’d like to still get the discount and get on the list, payment must be made immediately. Please email me for additional information. I will only extend the pre-ordering until today, 4/1/2013. Thanks!

  8. Richard Ermish April 23, 2013 at 2:51 pm #

    So can you put me down on the the post-pre-order list if there is such a thing? In other words, a waiting list if supply can’t keep up with demand. I only just became aware of the 627 a few hours ago, read the reviews and now have Portaphile GAS.

    • PortaphileAdmin April 23, 2013 at 3:19 pm #

      Hi Richard, there is no longer a pre-order list. The pre-order list was for those who wished to order before the 627X was finalized and could receive a discount for having to wait. I am done with designing and fine tuning the 627X electronics and am just trying to finish up the case work now. You can order at any time but please expect a 2 to 4 week wait time before I can ship an amplifier out to you. You can place an order by going to the products page and complete the ordering process there. Thanks!

  9. Ken Kloss May 21, 2013 at 12:29 am #

    I just ordered the 627X for my sons portable rig. I have had the 627 for about a year on my system and it is an amazing amp. I bought and tried out 3 other amps last year which would be considered favorites on Head-fi and they do not come close to the dynamics and soundstage of the Portaphile.

  10. PortaphileAdmin May 22, 2013 at 5:55 am #

    Hi Andre, the larger case of the 627X allowed me to also upgrade the potentiometer. The 627X is a TDK-601 while the 627 uses an Alps. Both are very good potentiometers but the TDK is a step up in quality and performance (and costs 🙂 ). I’m just shipping out the current orders this week and hopefully some customers will post comments this weekend or early next. Please keep an eye out for upcoming feedback to see what people think of the new 627x.

    • Andre May 22, 2013 at 8:28 pm #


      No doubt!! Your amps have been widely regarded as some of the best on the market if not the best so I’ll be watching very closely and making my decision very soon.


  11. Xiang Dong February 13, 2014 at 4:05 pm #

    I am interested in purchasing a 627X amp, do you have any coupon for it?

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