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Massdrop x THX AAA™ 789 Linear Amplifier - Impressions Thread

Discussion in 'Headphone Amps (full-size)' started by XERO1, Mar 1, 2018.
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  1. Daemon Ursus
    Could be the power brick, the amps themselves look like they are fairly well made, but the power brick is pretty plainly just some cheap Chinese one they picked up for as little as possible. I plan on getting a mean well or something to replace it on mine shortly.
    cardeli22 likes this.
  2. FunctionalDoc
    Do you have a recommended power brick for this amp ?
    Last edited: Oct 25, 2018
  3. Alcophone
    Be careful.

    cardeli22 likes this.
  4. Alcophone
    What to choose, what to choose...


    Last edited: Oct 25, 2018
    cardeli22 and smallcaps like this.
  5. Alcophone
    Such straight



  6. Th3Drizzl3
    my first order will be here tomm. i ordered two of them but one was on a later drop. i hate that they use smartpost.

    if those tortoises are anything like ours when you feed them you better make sure you are out of the way haha. they are like a toyota corolla with 800 hp under the hood :joy:
  7. Volken
    Could you someday compare all your amps, very interested how Gustard H20 compares to THX.
    cardeli22 and Alcophone like this.
  8. negura
    I just took delivery. My amplifier came with an US mains plug. After checking the PSU unit it is autoranging so it takes UK/EU voltages. Luckily I had a spare 2 pin power chord around.

    To be fair they note this:
    US plug; adapter needed for global use

    Still, a reminder for non American users.

    On first listen the unit seems to operate fine.
    Last edited: Oct 26, 2018
    cardeli22 likes this.
  9. oqvist
    Don´t appear to be very thought through and lots of misstakes in the assembly. Just hope mine is alright. I can only hope I get it next week.
  10. Th3Drizzl3
    wellll mine is the same as heliospawn. the power button is not working. i get no lights when pressed and no relay click or anything. green led is lit on the power brick and i tested the power brick with my meter its working fine. i got it to come on once and only once. by kind of wiggling the power button and then that was it. now it will not come on at all after that. no smell no smoke etc....this sucks
  11. FunctionalDoc
    I bought new XLR interconnects and the balanced input from DX7S is working with any ground hum or noise . I hope the trend of dead units doesn't continue.
    cardeli22 and Alcophone like this.
  12. Alcophone
    I found a reliable fix for when mine won't turn on: pull the button back. It doesn't seem like it moves, but almost every time I do that, the next press will turn the amp on. Tried that about 25 times now. Fixed it every time but once when I had to repeat it.
  13. Th3Drizzl3
    ill have to play with it some more to be sure but i pulled out on the power button and something made a "click" noise like a plastic on spring type noise and now it seems to be turning on and off normally. im not sure yet though im going to use the button a few more days and then decide what to do. they said they would replace it. im annoyed about the gain knob a bit my II setting is also way off from the middle even a bit more then your pic shows.
    Alcophone likes this.
  14. tizman
    OT OT OT. I thought this was an impressions thread. Looks more like the defective power button thread. Has anyone who has listened to the amp have any listening impressions to share? A new thread about the power button issue would be in order. That way, people with that problem can search and find it.
    cardeli22 likes this.
  15. Th3Drizzl3
    well one cant give any impressions if the amp will not power on...... i would have had time to listen to it today otherwise. i still think its relevant info and should be in the main thread because so far at least my "impressions" are the amp sucks because for many it has issues. im hoping this fixed the issue who knows.
    Deftone, gtbrown50, cardeli22 and 3 others like this.
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