Massdrop x Eddie Current ZDT Jr.
Massdrop x Eddie Current ZDT Jr.
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Product Description
With great control of the entire frequency range and a far bigger sound than its small size suggests, the Massdrop x Eddie Current ZDT Jr. rivals tube amps in the $1,500 category ... Read More

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JaleesaG
1144
Admin User
Aug 21, 2018
Stickied
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Hi everyone, It has come to our attention that a few drop participants are experiencing a hum in one or both channels of the Massdrop x Eddie Current ZDT Jr. We wanted to let you know we are aware of this issue and are looking into possible solves for it. If you are experiencing this issue with your unit, please reach out to our Community Support team for further assistance via your transactions page: https://www.massdrop.com/transactions. They will be happy to assist you in either a return and full refund or in repairing your amp as soon as we determine the cause of the issue. We apologize for the inconvenience and are working with the manufacturer to resolve this as quickly as possible, so you can enjoy your amp as intended.
Aug 21, 2018
karnacopia
0
Jun 5, 2019
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still waiting...
Jun 5, 2019
Tex1954
59
Jun 5, 2019
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I already got my fixed unit. I received the email in December. They had a January deadline to respond.
Jun 5, 2019
tinamou62
33
Jul 18, 2019
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First impressions - will post a proper review later in "reviews". The hum issue is not present in my amplifier, so if that's what you're worried about hopefully you will also be fine. Wow, this thing is much better than the CTH for my HD800S. Songs just sound much more full. There is a depth to "Hide and Seek" by Imogen Heap that made me feel like I was listening to that song all over again. Concentrated bass slams like the drumline in Loyal by Odesza definitely hit harder. Mid presentation is more forward, feels more intimate and again has more depth to it. I do not experience the "holographic" soundstage others have talked about, in fact, things sound a bit smaller than the CTH in my short time listening - I have only used the amp for ~3 hours so maybe that's a burn-in type of thing. But wow, timbre and bass slam is so much better. I do have one issue, but it is not at all with the amp - but I want to make people aware. If you are using a USB, this amp is VERY sensitive to USB noise. It seems to be picking up noise out of my USB-C port on my laptop. When I plug my laptop in to charge and run the USB C out -> SDAC -> ZDT Jr, there is a persistent and extremely audible whine - it's not like a tiny little detail, it's obvious and really annoying. I tried using the USB-C out on my Pixel and voila, no whine. This is NOT at all an amp problem, it is a USB-C noise issue and presumably some grounding issue from what I've seen - but if you're using a DAC that does not have its own power supply (that draws power from USB like the SDAC) then you might also run into this problem. To remedy this problem, I have just unplugged my laptop. The whine becomes about 10x less audible and almost unnoticeable although still there if you pay attention. If anyone has a solution to USB noise I would love to hear it. Would buying a DAC with its own independent power supply fix this? cheers!
Jul 18, 2019
tinamou62
33
Jul 15, 2019
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I have hopped on the hype train. As an owner of the HD800S and a MCTH that I am very happy with, I am excited to see what an all-tube design does for these cans. Will report back to you all soon :)
Jul 15, 2019
mimizone
7
Jul 13, 2019
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I have one of those from a previous drop. It sounds nice and almost zero background noise. Very good. Though mine has a weird behavior. To use it, I actually have to switch it on AND remove the 2 small tubes, and reinsert them in. Otherwise the tubes don't light up and no sound comes out. Weird...
Jul 13, 2019
Tex1954
59
Jul 15, 2019
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You might join SBAF and post your problem on their ZDT jr thread. Just be sure to follow their guide lines, introduce yourself etc. There's a Russian poster (Zampotech) that works on this amp and is very helpful. https://www.superbestaudiofriends.org/index.php?threads/massdrop-x-eddie-current-zdt-jr-official-thread.5408/page-35
Jul 15, 2019
mimizone
7
Jul 16, 2019
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Oh sweet! Thanks for all the info
Jul 16, 2019
mb1534
3
Jul 12, 2019
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Just got mine and using with my Hugo 2 as a Dac with Verastarr silver interconnect. My Audeze MX4 with Dekoni lambskin pads played through Roon with Audeze eq pure bliss! Upgraded tubes to5654w in front much better bass control and this thing isn’t broken in yet. The Chord plays a big part, I also use it with my Koss 95xx
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Jul 12, 2019
verifonix
589
Jul 12, 2019
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Those interconnects look ridiculous lol
Jul 12, 2019
owenhuu
5
Jul 14, 2019
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Did your power re-generator made a difference?
Jul 14, 2019
owenhuu
5
Jul 6, 2019
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Joined in June 2019, the volume from both low impedance output and high impedance output are exactly the same. Used a couple of not too hard to drive headphone to test my theory. Anybody else have run into this issue here?
(Edited)
Jul 6, 2019
jas722
0
Jul 13, 2019
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Hmm I thought it was just me, when trying out my HD6xx i barely have to turn the knob up at all before i'm at listening levels. Thought it was inexperience with tube amps.
Jul 13, 2019
owenhuu
5
Jul 13, 2019
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Yep, both outputs have a gain of 12 dB, the difference, I think, are different voltage and current to drive different headphones.
Jul 13, 2019
Unowned
5
Jul 4, 2019
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How do these compare with the bottlehead crack + speedball? I would like to know how it performs in terms of soundstage. I have a hd6xx
(Edited)
Jul 4, 2019
WheelHoss
7
Jul 7, 2019
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Second thoughts on what?
Jul 7, 2019
Unowned
5
Jul 7, 2019
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Second thoughts on whether I should buy a good expensive amp, or a better headphone.
Jul 7, 2019
jaydunndiddit
2319
Jul 3, 2019
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Welp, just got my ZDT in the mail and thoroughly enjoying it so far. Happy to say also, no him as far as I can tell. Plenty of power on tap. More than you'll ever need. I can barely go past 9 o'clock on the dial before the Elear gets painfully loud. But, everything sounds very good so far. Much cleaner sounding than I was anticipating and not the super warm/tubey sound I was expecting. Which, really isn't a bad thing considering how clean this amp sounds for having tubes. Listened to some masters in Tidal and watched Into the Spider-Verse, all of which sound pretty awesome through the ZDT. Can't wait to rack up the hours and get these tubes burned-in.
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And some shots of the tubes glowing nicely:
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(Edited)
Jul 3, 2019
jaydunndiddit
2319
Jul 7, 2019
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Enjoy. It's a solid amp and I'm not the biggest fan of tubes, either. Doesn't run as hot as the CTH and seems to have more power . I've realistically only taken it past half with my planars. Using it now with the Solaris and an IEMatch and it's a wonderful pairing. I also tried it out with my tube buffer and preamp and that brought some.more tubiness into the chain. The ZDT sounds surprisingly cleaner and a lot less tubey than one would think. At least to what I consider "tubey." And yup, I'll check my PMs on HF. Been a while since I've been over there, ha.
Jul 7, 2019
RockyMountains
449
Jul 12, 2019
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The Jr is made by Laconic in Russia, the Massdrop stuff is from China. So the casework is not supposed to match at all.
Jul 12, 2019
omajnardi
0
Jul 1, 2019
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Will this gear be part of the EU audio collection?
Jul 1, 2019
coolerking
132
Jul 1, 2019
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I'll tell you what would make push me over the fence and buy this amp. A sticky provided either above the one placed by JaleesaG on 8/21/2018, or directly below it, that would give me a "warm fuzzy" feeling by answering:
  1. What the Humm issue was
  2. What was the fix
  3. What has been done to assure the original issue, or any others, will not rear its ugly head on this second drop
In other words...... I want to buy this amp but I am nervous about running into a quality problem. I am finding myself sorting through a large and confusing discussion thread. It is giving me a gosh darn headache. How about you just save me the headache, and provide a tonic for my apprehension. In return, if the tonic works and funds permitting, I'll buy it. Thanks Fellas.
Jul 1, 2019
coolerking
132
Jul 3, 2019
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Thanks for the input guys. I had hoped Drop would answer this, I was not clear in my original post. I can't quite figure out why Drop is so cavalier about this IMHO the. Problem is not the EMI (electro magnetic interference) but the fact in happened in the first place. ,$400 is paying for a product that is designed, made, and outgoing tested well. Eliminating noise is 1 of the biggest challenges in analog design, especially for a high performance audio product. This is not the software world where a major revision is followed many subsequent drops as bugs surface with customers. Even then the vendor provides a small explanation. This is ANALOG, I feel like a broken record saying this. Of course there is EMI, you design against this, that's analog design. It's like a tire company saying, there are potholes on the road which ausea the tires to right rough, so send the tires back, we will re work them. And no more assurances or explanations. Something broke down in the design, build, sell process to let these products out. What makes me nervous is that there is no official statement. Alright, I always try to point out that Drop adds more value than other sales channels when folks complain that they have found pricing from another vendor, like Amazon, that Drop is not just a price play. They aren't adding much value here though
Jul 3, 2019
pure5152
63
Jul 5, 2019
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If it helps at all, I received my unit and there’s absolutely no audible hum except when using sensitive IEMs.
Jul 5, 2019
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Jul 18, 2019
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First impressions - will post a proper review later in "reviews". The hum issue is not present in my amplifier, so if that's what you're worried about hopefully you will also be fine. Wow, this thing is much better than the CTH for my HD800S. Songs just sound much more full. There is a depth to "Hide and Seek" by Imogen Heap that made me feel like I was listening to that song all over again. Concentrated bass slams like the drumline in Loyal by Odesza definitely hit harder. Mid presentation is more forward, feels more intimate and again has more depth to it. I do not experience the "holographic" soundstage others have talked about, in fact, things sound a bit smaller than the CTH in my short time listening - I have only used the amp for ~3 hours so maybe that's a burn-in type of thing. But wow, timbre and bass slam is so much better. I do have one issue, but it is not at all with the amp - but I want to make people aware. If you are using a USB, this amp is VERY sensitive to USB noise. It seems to be picking up noise out of my USB-C port on my laptop. When I plug my laptop in to charge and run the USB C out -> SDAC -> ZDT Jr, there is a persistent and extremely audible whine - it's not like a tiny little detail, it's obvious and really annoying. I tried using the USB-C out on my Pixel and voila, no whine. This is NOT at all an amp problem, it is a USB-C noise issue and presumably some grounding issue from what I've seen - but if you're using a DAC that does not have its own power supply (that draws power from USB like the SDAC) then you might also run into this problem. To remedy this problem, I have just unplugged my laptop. The whine becomes about 10x less audible and almost unnoticeable although still there if you pay attention. If anyone has a solution to USB noise I would love to hear it. Would buying a DAC with its own independent power supply fix this? cheers!
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