Tube or Solid State Balanced Headphone Amplifier

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Wait. Tube or solid-state? Yes. Not only is Mjolnir 2 the only balanced tube hybrid headphone amp, it introduces our all-new LISST solid-state tube option for a 100% solid-state option. In terms of performance, it is a unique end-game headphone amp fully ready for any headphone, from IEMs to the hardest-to-drive planars.

Choose Tube Hybrid, Solid-State, or Both
Yes, that’s right. You can get Mjolnir 2 as a tube hybrid, or as a pure solid-state amp—or get both, and swap out as you’d like. You can also swap the standard 6BZ7 tubes for anything in the 6DJ8, 6922, ECC88, and 2492 families, to “roll” the sound to your specific preference. Or just opt for the Schiit LISST (Linear, Integral Solid-State Tube) for a 100% solid state amp. 
Power and Control in Abundance
Mjolnir 2 puts out up to 8W/channel into 32 ohms, but is fully ready for high-sensitivity headphones with switchable gain. Use the standard gain of 8 for hard-to-drive headphones, or switch to a gain of 1 for sensitive on-ear models and IEMs. In addition, Mjolnir 2 also offers both balanced and single-ended input, switchable via the front panel. Want more? How about both balanced and single-ended headphone outputs and balanced and single-ended preamp outputs. Mjolnir also makes a great preamp for your power amps or powered monitors.
Pure Balanced, Differential Topology
Mjolnir uses our exclusive, inherently balanced and differential Crossfet topology—the only circlotron-style topology in a headphone amplifier (well, except for Ragnarok.) It’s balanced in and balanced out, with a custom 4-gang RK27 Alps volume pot—providing end-game performance for a mid-level price.
5-Year Warranty, 15-Day Satisfaction Guarantee
Mjolnir is covered by a limited warranty that covers parts and labor for five years. That’s 5 years. Yes. FIVE. Compare that to the competition. Don’t like Mjolnir? No problem. You can send it back for a full refund, minus 5% transaction fee, within 15 days of receiving your amp.
Made in USA—Really
Don’t roll your eyes. When we say, “Made in USA,” that’s exactly what we mean, with no weasel-wording. The vast majority of the total cost of Mjolnir goes to US companies manufacturing in the USA—most of them within easy driving distance from our office.

Frequency Response: 20Hz-20Khz, -0.1db, 2Hz-400KHz, -3dB
Maximum Power, 32 ohms: 8.0W RMS per channel
Maximum Power, 50 ohms: 5.0W RMS per channel
Maximum Power, 300 ohms: 850mW RMS per channel
Maximum Power, 600 ohms: 425mW RMS per channel
THD: <0.005%, 20Hz-20KHz, at 1V RMS
IMD: <0.006%, CCIF, at 1V RMS
SNR: >104db, unweighted, referenced to 1V RMS, in low gain mode
Crosstalk: >-75dB, 20 Hz-20KHz
Output Impedance: 1 ohm (high gain), 0.3 ohms (low gain)
Input Impedance: 50K ohms
Gain: 8 (18dB) or 1(0db), via front-panel switch
Topology: Tube voltage gain or solid-state tube voltage gain, cross-shunt push-pull Crossfet output stage, noninverting, single voltage gain stage
Power Supply: specific Circlotron 4-secondary output stage transformer with over 65,000uF filter capacitance, plus dedicated transformer for high-voltage discrete-regulated front end stage with 200V rails and over 4,000uf of filter capacitance
Inputs: one pair balanced XLR, one pair single-ended RCAs, switchable via front panel switch
Outputs: one 4-pin balanced female XLR, one ¼” TRS phono, one pair 3-pin male XLR preamp, one pair single-ended RCA
Power Consumption: 45W
Size: 16 x 8.75 x 2.25”
Weight: 13 lbs

Holy moly, Mjolnir 2 is now a tube amp? The previous one was solid-state. Are you manic-depressive or passive-aggressive or just indecisive?
No. We’re realistic. And the tube hybrid is only one option. You can have a pure solid-state Mjolnir 2, no problem, with our new LISST solid state tubes. There’s no real difference between a Mjolnir with LISST and the original Mjolnir (well, except for all the new features). Same topology…now with higher voltage rails for even better performance.

What is this LISST voodoo?
We put tubes into a industrial press and apply 650,000 tons of pressure, which compacts them into a solid-state device.

No, really.
Okay, fine. I see how it is. You really need to get a sense of humor.

Just tell me what a LISST solid state tube is, already!
It’s a pair of depletion-mode MOSFETs in a tube-sized can. That’s it. We’re not trying to replicate a tube. There’s no transfer function trickery going on.

That doesn’t tell me anything!
If you were an engineer, it would. In short, LISST is a dual solid-state gain stage that runs at tube voltages. It can simply replace a tube in the Mjolnir 2 circuit. But it’s not trying to be like a tube. Plug them in, and Mjolnir 2 is a solid-state amp.

So does it sound like a tube?
We ain’t touching that one. You tell us.

Will LISST work in other tube circuits?
They’ll work well in Lyr 2. In the original Lyr, they’re a bit noisier than real tubes, so you’ll want to use them with hard-to-drive headphones only. They’ll even make Lyr and Lyr 2 run cooler, because there is no heater connection. Beyond that, we haven’t qualified them in the 80,000 different tube applications out there.

But I really want to try them in my Gorblesnort AX27 guitar amp!
We strongly urge you NOT to use LISST in other products, because we have no idea if they’ll work right. Some amps will run voltages much higher than LISST can tolerate, which may mean insta-boom. Other amps won’t have pin 9 grounded, which also means no worky.

I’m gonna try it anyway, so there!
Just use LISST in our stuff, guys. Seriously. We can tell if they've been abused.

Okay. Let’s move on to the single-ended outputs. I thought you said Mjolnir couldn’t have single-ended outputs! What gives?
A circlotron has no inherent single-ended output. However, the circlotron outputs can be summed together, which is what we did here. Just like Ragnarok. Except lots cheaper. Shoot us for making Mjolnir 2 more flexible.

Do the single-ended outputs put out as much power as the balanced outputs?
No. They’re limited to about 2W into 32 ohms. Which is still plenty for most headphones.

Are you saying you also finally put some switches on the front of this thing for input switching and gain? I’ve been asking for that, for, like, forever.
Yep. Repeat after me: development improves the breed.

Hey, this thing runs warm!
Yep, just like Asgard 2 and Lyr 2.

So, is this really a balanced amp, or a fake balanced amp, or what?
Hey, don’t blame us for other manufacturers' abuse of terminology. When we say “balanced, differential,” that’s exactly what we mean. There’s no side-whispering going on about “Well, yeah, after we convert it to single-ended, then back to balanced again.”

What the hell is a Circlotron, and why do I need it?
“Circlotron” was the first commercial name for a cross-shunt push-pull output stage. At the time, it used tubes. We use MOSFET outputs, so we call our topology Crossfet™.

Crossfet™? Are the FETs angry?
No. They’re thrilled. N-channel MOSFETs and P-channel MOSFETs usually don’t match too well (and that’s putting it mildly.) Crossfet allows us to use only N-Channel MOSFETs, for better matching, and for an elegantly simple output stage with great performance.

The Ear: Mjolnir 2 and Gungnir Multibit
Richard Barclay

"Mjolnir 2 immediately impresses with its exceptionally low noise floor. This amp is super quiet and provides a spookily muted backdrop for low-level detail to emerge from, especially on the low gain setting which is so silent through over-the-ear headphones you would think you were in an anechoic chamber!"

"Mids are majestically mellifluous in tone yet remain very open, detailed and transparent. Highs are impressively extended, invigoratingly crisp and articulated with improved micro-detail distinction. The soundstage grows in all dimensions with instruments more clearly layered and spaced around the listener in an enveloping sphere of sound, giving a heightened sense of being at the epicentre of the performance."

"While the single-ended circuits are excellent, trading up to balanced elevates the performance to exceptional - and I dare say peerless - in this price range."

"Together, the two units complement each other exceptionally well and offer a seductively revealing, immersive and textured listening experience in which music is allowed to breathe freely. Their combined price-to-performance ratio verges on the ridiculous."


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