ZMF Pendant Amp on pre order

Discussion in 'Headphone Amplifiers and Combo (DAC/Amp) Units' started by Scubadude, Jul 11, 2018.

  1. Scubadude

    Scubadude Almost "Made"

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  2. willsw

    willsw Friend

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    Happy to see this, I know Zach has been wanting to make a ZMF amp for a while. An EL84 Ampsandsound will probably be nice.
     
  3. k4rstar

    k4rstar Britney fan club president

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    This amp looks pretty similar to the (now discontinued?) A&S Leeloo/SE-84. Both have 12ax7 voltage gain into EL-84 output, but it seems the Pendant sports a different choke for the power supply and tube rectification. It also ditches the speaker taps in favor of pre-amp outs.

    Unfortunately the product page for the Leeloo now returns a 404 so it's difficult to compare the new design further but it seems this collaboration was borne on that product. The price seems reasonable, I'd like to hear it.
     
  4. monacelli

    monacelli Friend

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    Here is the [Google cache] of the A&S Leeloo product page
     
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  5. ampsandsound

    ampsandsound MOT - Ampsandsound

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    Im happy to share info here if its ok.
    The Pendant is based on the D/C'd Leeloo, however so much of amp had to be redesigned it got a new name.
    All the transformers were redesigned. The Power transformer was upgraded to accommodate a tube rect. The outputs were respec'd. This was perhaps the biggest area of development. Multiple output transformers were tested (Similar bench results) and then were sent to ZMF for listening tests without Zach knowing which of the amps had the various changes... an attempt at a double blind experiment.
    New feedback network was also employed.
    The amp got Possitive changes we then have incorporated into our other amps.
    Sockets have labels behind the tube (not visible when looking at your amp).
    power supply was revised, spent a few hours combing through Mouser finding caps we liked/could fit. Increased filtering, coupled with new larger choke makes the pendant as quite or quieter than any ampsandsound amp before.
    The 1V P-P in for full power also means its easy to drive using a DAP.
    The pre out is also adds to the versatility of the amp.


    Hope this helps.
     
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  6. dpump

    dpump Rando

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    Like some clarification on the 12AU7/12AT7/12AX7 choice for input tube. The specs say 30%, 70%, or 100% of the available gain according to the input tube. So if I were using a 'standard' DAC with a 2V output, I would need to use a 12AU7 input tube to have a good usable range on the volume control? Or a 1V output DAP would need a 12AT7 or 12AX7? I guess headphone impedance and sensitivity would also come into play but my take on this is that you are using the input tube in place of a switchable gain control?
     
  7. ampsandsound

    ampsandsound MOT - Ampsandsound

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    We supply the Pendant with a 12AX7 with a Mu of 100. However, you can roll other 12*X7 family tubes with differing Mu's which will decrease total power out and have their own sonic signatures.
    Im not such a fan of switched gain... try to have our amps and simple/distilled as possible.
    We have tested with greater input voltage, no ill effects. The volume pot is an input attenuator.
    I would not be concerned with matching per se. Zach and others will chime in at some point, but there is more than enough usable range on the volume pot for nearly all headphones.
     
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  8. EagleWings

    EagleWings Friend

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    Justin, I am guessing the design does not have an input transformer, correct? What's the price for an external IT, if we would like to buy one separately?
     
    Last edited: Jul 12, 2018
  9. ampsandsound

    ampsandsound MOT - Ampsandsound

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    I think we are offering the external boxes at same price as internal when paired with the Pendant.
    There is room but I worry about placement... I rather make external boxes and not worry about potential noise issues re placement of the IT.
     
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  10. zach915m

    zach915m MOT: ZMF Headphones

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    Yeah maybe saying that the different 12axxx tubes work like gain is an oversimplification which is my fault for describing it that was on the site. With a 12au7 I can basically go to 10/11 am for loud loud on the volume knob where-as with the 12ax7 I am between 9 and 10am. More or less it just gives you more options of tubes to use depending on what you have or can find in good old 12ax/t/u7 variants. I'll change the website to reflect this more or at least make sure it's more clear.

    Really with any of these tubes the Pendant can drive just about anything as it has 2.5 watts of power at 300 ohms and 3 at the 8 ohm out.

    Also I don't think a gain switch is needed with where the volume sits right now, it has the right amount of "play" so that on most headphones you're going to be between 9 and 11 o'clock unless the headphone is super easy to drive or super hard to drive. In that case there's plenty of play on either end as needed for the particular headphone. Also the 8 ohm out has a bit more play than the 300 ohm out which has higher gain/volume.
     
    Last edited: Jul 15, 2018
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  11. allegro

    allegro Almost "Made"

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    @ampsandsound in your opinion how does the Pendant rate versus Kenzie driving HD800S on 300 ohm out?
     
  12. ampsandsound

    ampsandsound MOT - Ampsandsound

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    2 different sounds. The kenzie is warmer, the pendant is more detailed and faster.
    I really enjoy both, the Pendant wins for noise floor and thats saying something, as the kenize is very very quite.
     
  13. neogeosnk

    neogeosnk Friend

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    What are the dimensions of the Pendant? It may not fit on my desk.
     
  14. ampsandsound

    ampsandsound MOT - Ampsandsound

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    12.5" 9.5" 100% awsome
     
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  15. Jerry

    Jerry Facebook Friend

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    Where does pendant's power sit in your lineup. If I rememebr correctly: Mogwai se > mogwai > kenzie encore > kenzie.
     
  16. ampsandsound

    ampsandsound MOT - Ampsandsound

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    Mogwai SE, Pendant, Mogwai, Encore, Kenize.
     
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  17. dpump

    dpump Rando

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    Don't forget that the output power of the Kenzie is higher if you are using 12B4A output tubes instead of the 1626. Might change the power output ratings of the different amps.
     
  18. Jerry

    Jerry Facebook Friend

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    The same with mogwai/mogwai se with KT-88 and 6SL7.
     

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