Japanese designer Koichi Futatsumata, founder of Case-Real studio, has designed a vacuum tube amplifier for electronics manufacturer Elekit.
Elekit traditionally manufacture affordable, high-end audio equipment in kit form. Fatsumata was commissioned to design an amplifier that would be sold ready-assembled to appeal to a younger generation.
The prototype shown largely follows the established typology of tube amplifiers but the circuitry and mechanical parts that are usually left exposed to aid cooling are hidden inside the steel casing.
Instead, the aluminium top from which the vacuum tubes protrude acts as a heat-sink to dissipate heat from the components.
All the controls have been integrated into two front-mounted aluminium dials.
Photos are by Hiroshi Mizusaki.
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ELEKIT TUBE AMPLIFIER
by Koichi Futatsumata / CASE-REAL
Design of a new generation vacuum tube amplifier for EK Japan Co., Ltd.(Fukuoka, Japan) who develops numerous electronic kits/ gadgets targeted at both children and adults.
Traditionally, the types of assembly audio kits EK JAPAN has developed have been largely for audio or mechanical maniacs, for an affordable price, thereby serving their quality of life by way of spending time to assemble and then to enjoy the audio from what they have made. The direction of a project commissioned to us this time was completely different and was to design a compact, stylish vacuum tube audio consonant with the life style of young generations novice about vacuum tube but are naively interested in the charm and atmosphere created from/ via a vacuum tube amplifier.
The prototype, as shown in the photo, is an embodiment of the concept which symbolically gives an accent on vacuum tubes on the top, supported by aluminum dials on the front integrating all controls thereinto and by the sides made of cast steel. So that a vacuum tube light stands out, the mechanical structure and parts (which usually exposed outside to radiate heat) are kept inside and the top aluminum plate functions as a heat sink instead.
The circuitry a hybrid configuration, and, on the right side is a mini- jack for portable music players like iPod.
[Product] Vacuum tube hybrid stereo amplifier
[Design] Koichi Futatsumata / CASE-REAL
[Manufacturer] EK JAPAN
[Circuit components] Tone control stage / Tubes (2x 6SN7GT), Power amplifier stage / Semiconductors (IC)
[Rated output power] 10 + 10 Watts
[Rated powe consumption] 38W
[Rated Power source] 100V AC 50-60Hz
[Input / sensitivity] Rear RCA jacks / 560mV (For component type player), Side mini phone jack / 180mV (For portable music player)
[Frequency response] 5Hz - 50kHz (-3dB)
[Dimensions] W265 x H103 x D151 (millimeters, including projections)
[Body Weight] 2.6kg
[Special feature] Automatic sleep mode (at no input signal)
After some searching, my Elelkit TuTu has arrived and I have been running in the amplifier for the whole evening. The size is very small and it will be ideal for my office use or when use back in Singapore...
For the past 8 years, hobbyists have been asking for certain features to modify the TU-879S kit. The highly regarded Elekit designer, Mr. Fujita, has taken all those specific features and specifications into consideration and we are happy to welcome the release of the newly designed TU-8200 in January 30, 2014. TU-8200 has a lot more improvements from its predecessor(TU-879S).
DX model included :
4 X Amtrans AMCO 104 Metalized PET film capacitors
4 X Nichikon conductive polymer aluminum electrolytic capacitors
■ "Active automatic bias adjustment function"
TU-8200 is shipped with 6L6GC power tubes - but also supports a wide range of power tubes such as KT66, KT88, EL34(6CA7), 6550, and others with no modifications. Simply swap power tubes and no need to re-bias. A newly-developed "Active automatic bias adjustment function" automatically adjusts the bias for the optimal
condition for each tube. No more matching tubes or having to manually re-bias when switching tubes. This function lets you enjoy the best sound of various power tubes without a trouble.
■Select from 3 types of amplifier modes
Ultra-linear, Triode, or Pentode
The mode can be easily changed by simply moving the jumper connections on the PCB.
■ World-wide power transformer
TU-8200 is shipped with a world-wide power transformer that supports 4 different voltage
environments: 100V, 115V, 200V, and 230V.
■ USB-DAC（PS-3249) - optional accessory
■ 70μm thick copper PCB
■ Front panel headphone jack
●Stock tube : 6L6GC x 2pcs, 12AU7 x 2pcs
●Rated output : 6L6GC (UL connection) 8W + 8W
6L6GC (Pentode) 8.2W + 8.2W (all 8 Ω loaded)
6L6GC (Triode) 4W + 4W
●Rated input : 6L6GC (UL connection) : 340mV
●Residual noise : 6L6GC (UL connection) : 0.09mV (IEC)
●Frequency response : 12Hz - 50kHz (-3dB)
●Input terminal : LINE x 2 (LINE1, LINE2)
3.5mm stereo mini jack (Common with LINE2, but has a priority to LINE2)
●Output terminal : Speaker output terminal (4-6.3Ω, 8-16Ω : Switching)
Gold-plated screw type terminal (Banana plug can be used.)
●Power voltage : AC100V 50/60Hz (3P inlet) ●Power consumption : 60W (with 6L6GC)
* 115V, 200V, or 230V specification available by changing the connector
position upon assembly.
●Dimensions : W252xH158xD285mm (including projections)
●Weight : Approx.6.6kg (assembled. Excluding the power cord)
