Softone's AUDIO PRODUCTS

The vacuum tube amplifiers play gentle and mellow sounds.

You spend a restless life now, don't you? In a technological age, you have to deal with many new difficult things. When you take a rest and listen to your favorite music, why don't you enjoy gentle and sentimental sound that transcends the times?

Model10 Fully differential balanced output Headphone Amplifier

• Fully differential amplifier
• Various headphone output
  3 types of balanced output
  • Korean iriver standard 2.5mm 4-pole jack
  • China OPPO / HiFiman standard 3.5mm 4-pole jack
  • Japan Sony standard 4.4mm 5-pole jack
  Unbalanced output
  • 3.5mm stereo jack (4 pole pseudo balance compatible)
• High power output
  Balanced 3.5W, Unbalanced 1W
• Wideband all-stage direct-coupled DC amplifier　DC to 250kHz
• Discrete configuration, No OPamps.

Introduction of Model10 Headphone amplifier
Technical description of Model10

Model8 Stereo Power Amplifier

Model8-300B

Model8-205D

Class A single ended operation.
300B or FullMusic 205/n can be selected in the output tube.
Model8-300B 8W+8W
Model8-205D 2W+2W
Three stage direct coupled and fixed bias circuit.
High quality R-core output transformer and R-core power transformer.

Introduction of Model8 Stereo Power Amplifier
Technical description of Model8

Model7 Stereo Power Amplifier

16W+16W Class A push-pull operation.
RCA Unbalance input and XLR Balance input.
EL34, KT66, 6L6GC, KT77, KT88, 6550, and 350B　can be used by no adjustment.
High quality R-core output transformer and R-core power transformer.

Introduction of Model7 Stereo Power Amplifier
Technical description of Model7

300B/205D Push-Pull Monaural Power Amplifier

300B / 205D compatible.
20W output with 300B.
12W output with 205D
Interstage transformer drive circuit.
High quality R-core output transformer and interstage transformer.
Full hand wired.

Introduction of 300B/205D Push-Pull Monaural Power Amplifier

This Amplifie is Make-to-order product.
It takes about 1.5 months from order to shipment.

Price for 1 set ( 2 units )　
US$ 2,300 with 300B
US$ 2,800 with FullMusic 205D/n
Inquiries and orders : softone@nifty.ne.jp

Model5 Selector & Attenuator

Pure sound quality and high reliability
Model5 offers the best input selection, volume control, and balance control function.

Introduction of Model5 Selector & Attenuator
Technical description of Model5

Model4 Phono Equalizer Amplifier

For a better playback of a precious analog disk.

Introduction of Model4 Phono Equalizer Amplifier
Technical description of Model4

FRONTBOX2 Kit for ANALOGDISCOVERY2

FRONTBOX2 makes ANALOGDISCOVERY2 the same easiness as a general measuring instrument.

• BNC connector to connect with measuring object.
• Switches and Potentiometers to set measurement condition.
• Chassis that excludes noise and achieves steady measurement.
• Extension connector similar to input-output terminal of ANALOGDISCOVERY2.
• Because this item is a kit, the assembly work is necessary.
  ANALOGDISCOVERY2 is not included in this item.

Introduction of FRONTBOX2 for ANALOGDISCOVERY2

R core Audio Output Transformer

We have introduced R core for this new audio output transformer. R core is a new type of magnetic core for transformer and now increasingly used for power transformers because of its performance advantage over the other conventional magnetic cores. Both transformers for push-pull and for single-ended are available.

• Wide bandwidth, low magnetic loss, and low distortion
• Enclosed in elegant square steel case
• Reasonable price

RX-30-8 Push-Pull 8,000 ohms 30W type
RX-40-5 Push-Pull 5,000 ohms 40W type
RX-80-5 Push-Pull 5,000 ohms 80W type

RW-20 Single-Ended Universal 20W type
RW-40-5 Single-Ended 3K / 5K ohms 40W type
RW-40-9.5 Single-Ended 5K / 9.5K ohms 40W type

The right on the photo is the R core output transformer in bare condition. The product is enclosed in the square case on the left.

R core Interstage Transformer RC-20

Multipurpose interstage transformer promising versatile operations

• Wide bandwidth, low magnetic loss, and low distortion
• Primary 1 + 1 : Secondary 1.8 + 1.8
• Advanced versatility supporting various circuits: single-ended, push-pull, etc. and various impedances by selecting series or parallel connection of primary and secondary windings
• Can be used as input transformer for inverted interstage transformer coupling amplifier
• High power handling capacity assured by large-size R core. Optimum for powerful drive by small or medium power tube
• DC current can be superimposed in the primary. Maximum permissible current: 30mA when the primary windings are connected in series.
• The secondary can be opened (without load). No peculiar peaks and dips are observed in the frequency characteristics even when the secondary is opened.
• Enclosed in a handy and beautiful square case. The same mounting dimensions as Tango NC-20F.
• Reasonable price US$ 120(excluding tax & shipping)

RC-20 Interstage Transformer

The right on the photo is the R core audio interstage transformer in bare condition. The product is enclosed in the square case on the left.

MC CARTRIDGE STEP UP TRANSFORMER PLT-1

PLT-1 is a step up transformer for MC cartridges. It is suitable for MC cartridge of an impedance 10 ohm and a 40 ohm.

• It corresponds to two types of MC cartridges, 10ohm and 40ohm.
• A 78% Nickel permalloy L type core suitable for a small signal.
• High external noise exclusion capability by balance structure winding.
• A wideband and a smooth frequency response characteristic.
• Low direct-current resistance winding, and low loss.
• Magnetic prevention case.
  

PLT-1 MOVING COIL CARTRIDGE STEP UP TRANSFORMER

MS-2a Chassis for monaural amplifier

MS-2a is a suitable chassis for producing 300B, 2A3 and 45 etc monaural amplifiers with R core transformer.

• Chassis for Single ended and Push-pull monaural amplifier.
• Portrait shape. When two is arranged, it is width of an almost standard stereo amplifier.
• Front panel and exterior and interior parts.
• Gold-plated input terminal and gold-plated speaker terminal.
• It suits our R core input transformer and output transformer.
• It suits the power supply transformer and choke coil by NOGUCHI and KASUGA co.
• Composition of tubes
  One MT 9pin tube and three UX or US 8pin tubes.
• The tube socket is included.

MS-2a Chassis for Single ended and Push-pull monaural amplifier

Application Notes using R core Audio Transformer

SV811-3 Single-Ended 12W Monaural Power Amplifier

Building amplifier project using RC-20 Interstage Transformer, RW-20 Single-Ended Output Transformer, and MS-1 chassis. This is a very beautiful tube amplifier with power tubes SV811-3 brilliant like electric globe. This is a high power amplifier that outputs 12W being 50% more than 300B. The main feature, however, is first and foremost easy to build by its configuration of both the power supply voltage less than 500V and the inexpensive parts commonly available in the market.

2A3 Push-Pull 20W Monaural Power Amplifier

Building amplifier project using RC-20 Interstage Transformer, RX-40-5 Push-Pull Output Transformer, and MS-2 chassis. This amplifier realizes 20W high power output and excellent performances (low distortion, wide bandwidth, high output, and low noise level) that are difficult to be achieved by the single-ended amplifier. The main feature is well balanced sound quality based on straightforwardness and well-developed mid and low range particularly characterized by interstage transformer coupled circuit.

Ordering the audio products ( Phono Equalizer, Selector & Attnuator,Amplifier)

Ordering the audio transformers, Chassis, Kit

eMail: softone@nifty.ne.jp Questions, here

The relationship Softone and ICL

Softone, Inc.

11-5, Sakuradai, Aoba-ku, Yokohama, Kanagawa, 227-0061, Japan

E-mail address: softone@nifty.ne.jp
Facsimile : +81-45-989-4642

Copyright(C)2000-2013 Shoichi Yoshimoto