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
A Smaller, More Accessible Zana Deux

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. Endorsed by Craig Uthus of JBL, Moth Audio, and Eddie Current fame, it’s based on the Night Blues Mini from his longtime partner, Laconic Lab, and closest in topology to the Eddie Current Zana Deux Transformer (also known as the ZDT). The ZDT Jr. is warmer than a tube hybrid and clearer than an OTL (output transformerless) design, with all the spaciousness, bass slam, resolution, natural decay, and realistic but non-fatiguing treble folks look for in a tube amp. An ideal pairing for the Massdrop x Sennheiser HD 6XX and HD 800, it’s equally suited for planar headphones, thanks to its transformer-coupled high- and low-impedance outputs.

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Transformer Coupled & Desktop Friendly

For the ZDT Jr., we sought to capture the magic of an Eddie Current design in a tube amp that everyone could enjoy. This transformer-coupled output design was specifically requested by the audiophile community, who has had difficulty getting 110V versions for North America. Craig endorses the transformers and tubes he thought were best—two NOS Russian 6ZH1P and two 6N24P—and oversaw all cosmetic improvements, including a unique seven-sided volume knob. To make the price more accessible, we removed the larger and more powerful aspects of the Zana Deux line and opted for a smaller, desktop-friendly size. The result is an amp in a class of its own, beating out most others except those kilobuck amps that get exceptionally hot or require very expensive tubes.

  • Massdrop x Eddie Current
  • Frequency range: 10 Hz–30 kHz (+/- 1 dB)
  • Noise: -90 dB
  • Gain: 12 dB
  • Dynamic range (under a load of 24–600 ohms): 87 dB
  • THD: < 1%
  • Input voltage: 0.25–2 V
  • Tubes: 2 x NOS Russian 6ZH1P, 2 x 6N24P
  • Transformer output: "Ш-iron" M6
  • Headphone outputs: 2 x ¼ in (6.3 mm)
  • Low-impedance output: 32–100 ohms
  • High-impedance output:  100–600 ohms
  • Power supply: Built-in, IEC cable
  • Input: RCA
  • Pass-through output: RCA
  • Chassis: Black painted steel
  • Faceplate: Staron
  • Dimensions, W x H x D: 6.3 x 4.3 x 8.7 in (16 x 11 x 22 cm)
  • Product weight: 4.4 lbs (2 kg)
  • Packaged weight: 6.8 lbs (3.1 kg)
  • User Manual
  • Massdrop's 1-year warranty (Contact Massdrop with any service or amp-related inquiries)

All orders will be shipped by Drop.

Estimated ship date is July 19, 2019 PT.

Your payment method will be charged 2 hours after purchase. Cancellations are accepted until that time, after which the request will be submitted to vendors to deliver the best delivery time to members, making all sales final. Be sure to check the discussion page for updates.

Recent Activity
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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