Yamamoto
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Vacuum Tube Power Amplifier : A-08S 45single
A-08 that is the antecedent of this A-08S was evaluated very highly among the mania of the single amplifier of the vacuum tube, for instance, receive high evaluation since the launching and receive the SOTA prize in Internet audio magazine 6moons of U.S.A There are many one that are combined with the high efficiency speaker such as the ALTEC and LAWTHER into one of the user, although it was becoming the bestseller of No.1 among the product of our company and be desiring and be making lower the remaining noise and was receiving the request a lot. The quality of the sound at the time of the small signal is important' in a high efficiency speaker it is thought that it was the vacuum tube that 45' of the tone quality were suited to those request most. There is the characteristic that the high efficiency speaker appears largely as it is even the noise not only the music signal. Therefore the noise level needs to be held down over a general amplifier.
Vacuum Tube Power Amplifier A-09S : Yamamoto
THESE AMPLIFIERS ARE BUILT AFTER THE ORDER....THE DELIVERY TIME IS ABOUT 18-24 WEEKS
Non-feedback system single amplifier which adopted as the output tube 300B which occupies the status as a reference pipe of a present-day tube amp
A-09S is the power amplifier of the single stereo system which adopted famous 300B as the output tube.
The basic circuit has adopted the self-bias system of CR combination which uses pentode for a voltage amplification 300B single stereo amplifier A-09S.
In the amplification part, the natural acoustic field has been obtained taking advantage of the merit of the basic characteristic without the negative return with the non-feedback system.
The outstanding sound which carried out the one rise in ranking with the amplifier of conventional by re-examination from refinement of the ignition system of 300B or a drive circuit and the foundations of the parts to be used was realized.
Yamamoto : Cartridge Mono
YC-03S / YC-03M Specifications
Form: Low impedance MC cartridge
Channel composition: YC-03S: 45 and 45-degree system stereo / YC-03M: Parallel 2 winding 4 terminal monaural
Output voltage: 0.25mV (1kHz, 5cm/sec.)
Channel sepalation: YC-03S: 25dB or more (1kHz)
Channel balance: 1dB or less (1kHz)
Cantilever: YC-03S: 0.26mm dia. solid boron / YC-03M: 0.50mm dia. aluminum pipe
Stylus chip: YC-03S: Line contact needle / YC-03M: Round needle
Impedance: 1.2ohms
Proper needle pressure: 1.2-2.0g
Frequency characteristic: 20-20,000Hz
Body: YC-03S: African blackwood material (eco-paint finish)
YC-03M: Boxwood material (eco-paint finish)
Magnet: Neozium magnet
Outside dimension: 18 (W) 30 (L) 15 (H)
Weight: YC-03S: 8.0g YC-03M: 6.7g
Accessories: four-sets of M2.6 brass and gold plating attachment screws
Yamamoto Sound Craft : Vacuum tube Headphone amplifier HA-02
INFORMATION TAKEN FROM YAMAMOTO SOUND CRAFT
HA-02 is the headphone amplifier which uses a vacuum tube as an amplification element. Although output power is small, it has the output terminal for speakers and it can also sound a speaker with small volume as BGM.
Only one right and left are using each the miniature vacuum tube 408A of a Western Electric for an amplification tube. Although this WE408A is a vacuum tube of a vintage, it is one of the produced vacuum tubes, and since it was used abundantly for telefon equipment, there are no worries about a spare tube even now. It seems that it was used for various uses in order to often tend to use characteristics, although this vacuum tube is originally designed as an object for high frequency amplification. When it was used for the data of a Western Electric as a small output tube, there was description that about 300mW output power was obtained. When we manufactured the amplifier for headphone based on this description, we decided to produce commercially, since the good result was obtained.
Yamamoto Sound Craft : Vacuum tube Headphone amplifier HA-03
It is the optimal amplifier for a direction to use both headphone and a speaker.
HA-03 is the unique amplifier which designed headphone, of course aiming at the amplifier which can enjoy itself by the best sound quality also with the speaker.
The amplifier which can generally enjoy both headphone and a speaker in the optimal state is made difficult.
In this machine, I conquered the difficulty by using the highly efficient vacuum tube C3m with one-step composition.
As for vacuum tube amplifier, the simplicity of the composition appears in sound.
In the case of this machine, the charm which simplifies the composition to a limit and the vacuum tube has been pulled out to the maximum extent.
Since it is simple, freshness sound and music can be enjoyed.
Yamamoto Sound Craft : Vacuum tube power amplifier A-011 (2A3 single, with RCA 2A3 tubes)
Yamamoto Sound Craft of Japan is a high-end machine shop. They produce in-house whatever custom parts their audio division requires to go Kai-Zen - build big dreams in tiny steps. Wooden head shells. Cartridge parts. Precision meters. Teflon tube sockets with gold or silver-plated phosphor bronze (copper/zinc alloy) contacts. Wooden horns. Wooden tube sockets. Resin-impreganted Japanese Cherry wood panels that are hydraulically compressed, then vacuum-formed and phenol-injected to obtain Bakelite-type qualities and become hard enough to be precision CNC milled. Vintage-style tube shields. Solder lugs using the same Complite wood composite bases as the cover panels. C-core output, power and choke transformers. Ebony footers using NOS Japanese stock. Hermetically encapsulated coupling capacitors in Ebony cylinders to prevent long-term leakage. Custom speaker terminals. You get the picture. Off the shelf and over the counter are two phrases Shigeki Yamamoto does not understand.
Yamamoto Sound Craft : Vacuum tube Power Amplifier A-08S
Yamamoto Sound Craft of Japan is a high-end machine shop. They produce in-house whatever custom parts their audio division requires to go Kai-Zen - build big dreams in tiny steps. Wooden head shells. Cartridge parts. Precision meters. Teflon tube sockets with gold or silver-plated phosphor bronze (copper/zinc alloy) contacts. Wooden horns. Wooden tube sockets. Resin-impreganted Japanese Cherry wood panels that are hydraulically compressed, then vacuum-formed and phenol-injected to obtain Bakelite-type qualities and become hard enough to be precision CNC milled. Vintage-style tube shields. Solder lugs using the same Complite wood composite bases as the cover panels. C-core output, power and choke transformers. Ebony footers using NOS Japanese stock. Hermetically encapsulated coupling capacitors in Ebony cylinders to prevent long-term leakage. Custom speaker terminals. You get the picture. Off the shelf and over the counter are two phrases Shigeki Yamamoto does not understand.
Yamamoto Sound Craft : Vacuum tube Power Amplifier A-08SKIT
Yamamoto Sound Craft of Japan is a high-end machine shop. They produce in-house whatever custom parts their audio division requires to go Kai-Zen - build big dreams in tiny steps. Wooden head shells. Cartridge parts. Precision meters. Teflon tube sockets with gold or silver-plated phosphor bronze (copper/zinc alloy) contacts. Wooden horns. Wooden tube sockets. Resin-impreganted Japanese Cherry wood panels that are hydraulically compressed, then vacuum-formed and phenol-injected to obtain Bakelite-type qualities and become hard enough to be precision CNC milled. Vintage-style tube shields. Solder lugs using the same Complite wood composite bases as the cover panels. C-core output, power and choke transformers. Ebony footers using NOS Japanese stock. Hermetically encapsulated coupling capacitors in Ebony cylinders to prevent long-term leakage. Custom speaker terminals. You get the picture. Off the shelf and over the counter are two phrases Shigeki Yamamoto does not understand.
Yamamoto Sound Craft : Vacuum tube preamplifier CA-03
Form : Vacuum tube type preamplifier - use vacuum tube : product made from Telefunken 6AK5W 6 piece
<<Line amplifier part>>
- maximum output: -- 8V - frequency characteristic: -- 10-150kHz (-0.5db) - output impedance: -- 1.6komega - line amplifier part profit: -- 14dB (about 5 times) - residual noise: -- 0.13mV - signal to noise ratio: -- 92dB
<<Equalizer amplifier part>>
- maximum output: -- 28V - frequency characteristic: -- 30-15kHz(+-0.5db) - input impedance: -- 47komega, 1komega, and 100 ohms - output impedance: -- 4.8komega- amplification rate: -- 58dB/1 kHz
(The gain of the usual amplifier is a setup larger 24dB than a standard because of about 34dB.)
- residual noise: -- 2.3mV - signal to noise ratio: -- 110dB - outside dimension: -- 420(W)290(D)94(H) - weight: -- 6.3kg- price yen398,000 * Dual type type volume control volume is adopted.
Many characteristics of EQB-01 are the same as the phono equalizer part of CA-03L.
Yamamoto Sound Craft : Vacuum tube preamplifier CA-03L
Yamamoto Sound Craft of Japan is a high-end machine shop. They produce in-house whatever custom parts their audio division requires to go Kai-Zen - build big dreams in tiny steps. Wooden head shells. Cartridge parts. Precision meters. Teflon tube sockets with gold or silver-plated phosphor bronze (copper/zinc alloy) contacts. Wooden horns. Wooden tube sockets. Resin-impreganted Japanese Cherry wood panels that are hydraulically compressed, then vacuum-formed and phenol-injected to obtain Bakelite-type qualities and become hard enough to be precision CNC milled. Vintage-style tube shields. Solder lugs using the same Complite wood composite bases as the cover panels. C-core output, power and choke transformers. Ebony footers using NOS Japanese stock. Hermetically encapsulated coupling capacitors in Ebony cylinders to prevent long-term leakage. Custom speaker terminals. You get the picture. Off the shelf and over the counter are two phrases Shigeki Yamamoto does not understand.
Yamamoto Sound Craft : Vacuum tube preamplifier CA-04
Excerpt from 6moons review: The CA-04 line level preamplifier is based on the same circuit as the CA-03L full-function preamplifier with phono stage, but contains slightly different component parts choices to hot-rod performance while the chassis sports a Japanese Cherry fascia with African Ebony knobs. Brian adds that "in terms of sonics, the CA-04 sounds almost identical to the CA-03L, although it may be a tad more neutral. You'd really have to do lots of back-and-forth comparisons to hear the difference." The CA-04 uses hand-selected Telefunken 6AK5W (5654) pentodes chosen for their superior tone when used in this preamplifier's zero NFB circuit. Note this detail: The capacitors are mounted in African Ebony cases filled with a special Yamamoto epoxy blend claimed to give improved tone over conventionally mounted capacitors. Gain is 16dB and the frequency response ± 0.5dB from 10Hz - 150 KHz.