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Old 4th March 2018, 05:44 AM   #1
vkung is offline vkung  Canada
diyAudio Member
Join Date: May 2005
Location: Vancouver BC Canada


Vacuum Tube Hybrid Portable Headphone Amplifier [ TU-HP03 ]

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TU-HP03 is a successor model of reputed TU-HP01 which casted aside negative images of traditional vacuum tube amps, such as "heavy", "hot", "expensive", etc, and enjoyed a good reputation by its rich and warm sound from various age groups of people. This new model takes over such goodnesses of TU-HP01, and attractive features are added.

■Battery-operated sub-miniature vacuum tube (Raytheon 6418)
The same tube as TU-HP01 are used. Low consumption current and almost no heat generation so that there is no worry about the ventilation for heat release.

■Even lower noise than TU-HP01
The microphonic noise, often controversial in battery-operated portable tube amp, is even minimized than that of TU-HP01 by floating the tubes from the PCB and reviewing the circuit configuration. In addition, the white noise which could be annoying to your ears while there is no sound signal input is eliminated for better sound experience.

■Dual OPamp for each channel
For the earphone driving output stage, a dual OPamp is adopted for each channel, and the driving ability is boosted by connecting the OPamps in parallel, and the separation is also improved by 2 OPamps individually equipped for each channel.

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■Same as TU-HP01, users can exchange the OPamp with many other commercially-available OPamps sold in the market at reasonable prices to enjoy the sound difference.
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■Betterment upon Power ON
Although vacuum tubes are used, the amp can be ready to use in only several seconds after power ON. In addition, almost there is no pop noise upon power ON.

■Dual supply for OPamp
Large capacitors which have much effect on the sound are removed from the output stage to give clarity to the sound.

■Gain SW
Users can select either high or low gain according to the input level.

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Stock tube 6418 (Raytheon) x 2pcs
Stock OPamp JRC NJM2114DD (exchangeable for other OPamp)
Frequency response 10Hz-150kHz
Headphone impedance 16Ω-32Ω recommended
Input terminal 3.5mm stereo mini jack
Output terminal 3.5mm stereo mini jack
Power supply "AA" dry cell battery x 4pcs or "AA"Ni-MH rechargeable battery x 4pcs
* Battery life: Over 15 hours
Dimensions W74.5 x H17.5 x D162mm (incl. projections)
Weight 190g (excl. projections)

Elekit TU-HP03 | Super Best Audio Friends

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Last edited by vkung; 15th April 2018 at 04:05 AM.
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