Triode OTL Headphone Amplifier

Valhalla Options



We found a few old Valhallas while we were doing inventory at the end of the year, including a few black ones. If you're interested, act quick—these won't last long. No 15-day return, no exchanges, but full 5-year warranty applies.

Valhalla is a Class A, single-ended triode headphone amplifier with no overall feedback and noninverting circuit topology. It provides classic tube sound and can drive headphones with impedances as low as 32 ohms.

Yes, we know that all you got out of the preceding paragraph is probably, “Classic tube sound.” And if you’re not a tube junkie, you might not even know what that means. Some people say tube sound is a smoky nightclub with a hot chick in a red dress, it’s a warm swimming pool in summer, glowing green against the purple twilight, it’s a . . . well, hell, you can’t really explain tube sound. Think “smooth, fluid, liquid, alive.” But not in a SF-movie-gonna-eat-you kinda way. 
All Tube, All The Time
The only active devices in the audio signal path in Valhalla are tubes. The 6N1P triodes input provides linear, low noise voltage gain. The 6N6P triodes provide good power output capability for a wide variety of high-impedance headphones (though, if you're looking at orthos, check Mjolnir, Lyr and Asgard instead.)
High Quality Parts
Don't compare Valhalla to cheap tube amps using open-frame carbon pots and substandard parts. Compare it to tube amps using Alps Blue Velvet pots, Dale resistors, Wima capacitors, and other top-end components. Also consider that Valhalla has almost 2,000uf of filter capacitance in its oversized power supply, for superior performance.
5-Year Warranty 
Most of Valhalla 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. The parts that aren’t covered by a 5-year warranty: the tubes. Tubes are covered by a 90-day warranty. They should last between 3,000 and 5,000 hours, but they do wear out. They will need replaced. Do not panic. Humans lived for many decades with this technology.
Headphone Impedance: 32-600 ohms
Gain: 8 (18 dB)
Frequency Response: 10Hz-200KHz, -3dB
Maximum Output: 30V P-P typ
THD: Less than 0.2%, 20Hz-20KHz, at 1V RMS
Output Impedance: 25 ohms
Topology: Class-A single-ended triode, no overall feedback, noninverting, single voltage gain stage
Tube Complement: 6N1P dual triode input, 6N6P dual triode output, 1 each per channel. 6N1Ps rollable to 6DJ8, E88CC, 6922, 6BZ7, and similar types.
Power Consumption: 40W
Size: 9 x 6.75 x 3.25”
Weight: 7 lbs