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Rajio Gijutsu

Attraction of large directly heated triodes. TM-100 single poweramplifier.
WE-212D single amplifier. Part 2. Parallel feed WE-205D singledriven amplifier.
UHC/MOS-FET power amplifier. 2. UHC/MOS-FET low-frequencyamplifier.
Interlocking triode single amplifier eliminating distortion byserially coupled independent vacuum tubes. Part 1. Fundamentalexperiment by 8417(+).
BTL adapter utilizing the merit of balance drive.
DC type micro-headphone amplifier possible to drive aloudspeaker.
Lecture: Practical live music recording technique. 46. Obtainable overseas capacitor microphones.
Real 16bit DAC complete CD player. Concept and all technicaldata of Marantz CD-7.
8-times over sampling for 96kHz and 24bit. Details of Burr-Brown DF1704 digital filter.
Experimental design lecture of transistor amplifiers. Practicaltechnology. Chapter 8. Design of stabilized power-supply. 2.
Complete measurement series. 48. Listening and measurement ofWorld Audio Design KLPP-1 preamplifier with phono-equalizer.
Walking lane of audio measurement. Measurement of the action ofloudspeakers around f 0 . Part 3.
Key of playback for analog disks. History and technology ofcartridges. On cartridge. 102.
Simple vibration engineering. Vibration, wave and sound. 19. Horn profile and its properties.
3
Prototype low-feedback single stereophonic amplifier using PX-25A.
WE-212D single amplifier. Part 3. WE-300B single-driveamplifier.
Large directly heated triode amplifier using a plate chokesystem. 845 single power amplifier.
UHC/MOS-FET power amplifier. Part 3. Yamanaka's 4-channeldivider designed for Goto' unit.
Interlocking triode single amplifier eliminating distortion byserial coupled vacuum tubes. Part 2. Using 50CA10.
Revival of an SP system by replacing a tweeter. Importance oftime base and phase matching.
Measurement of the action of loudspeakers around f 0 by usingwhite noise. Part 4.
Examples of complete digital measurement for loudspeaker systems. Diatone Schroeder processing data measurement of domestic andoverseas loudspeakers.
Complete measurement series. 49. Listening and measurement ofKanno's stereophonic preamplifier KP-300.
mprovement of characteristics of TM-100 single power amplifier.
Experimental design lecture of transistor amplifiers. Practicaltechnology. Chapter 8. Design of stabilized power-supply.
Simple vibration engineering. Vibration, wave and sound. 20. Directivity dependent on aperture profiles.
5
Challenge to an accepted opinion of non-feedback for direct heated triode. Manufacturing of a high feedback 300B single amplifier. 2.
manufacture of multi- EQ phono-amplifier with the regenerative function for SP, early LP and stereo LP records.
Fabrication of MOS-FET BTL power amplifier adopting the Intra system.
Production of a divider for super woofer and also for small woofer with the law boost circuit of the plug-in type and the frequency switching type.
Production of a three-tube interlock single amplifier with beam tube and large transmitter tube. 1. 4P55 single .
Production of the UHC MOS-FET power amplifier. 5. Improvement of power amplifier for medium and high-pitched sound for JBL driver.
Four way system with a concrete horn.
Fabrication of a controller for AV equipments using direct current relay and an intelligent remote controller.
Measurement in audio equipments. The measurement of leakage magnetic flux of twisted wire and transformer.
Everything of Victor SX-9000.
Design and manufacture of a DAC board corresponding to 24bit 96kHz. Examination of the one's own making DA converter. 1. Basic concept.
Comprehensive measurement series 50. Listening to and measurement of M.A.C. Phono Equalizer Amplifier of Tube Technology Co.
Experiment and design of transistor and amplifier. Practical technique. Chapter 8. (5) Design of stabilized power source.
6
Memorial product for Mr. Kazuma Takesue. Fabrication of 6C33C-B para single OTL amplifier.
Memorial product for Mr. Kazuma Takesue 1. Replace the classical tube 10 and 50 for fun. Fabrication of 10/50 compatible single amplifier.
Memorial product for Mr.Kazuma Takesue 1. Application of the transformer & chassis kit of HAMMOND MANUFACTURING, CANADA. Fabrication of STC-12E1 single power amplifier.
Fabrication of UHC MOS-FET power amplifier (6). Approach to high power level by BTL system.
Memorial product for Mr. Kazuma Takesue 1. Challenge to the accepted opinion (? ), "no negative feedback for direct-heated triode". Fabrication of high feedback 300B single amplifier (3).
Fabricate an arm !! Rotary shell and swinging method are introduced to SME arm.
Fabricate an arm !! Remodel the stress-free arm to have rake angle of 15.DEG. .
Fabricate an arm !! Fabrication of law cost arm with head amplifier using string-suspended shell of revolution.
Audio measurement. Measure the leaked magnetic flux of power transformer.
No.1149. YAMAHA YST-SW160 super woofer system.
No.1150. ALR/JORDAN Entry 3M speaker system.
No.1151. MARK LEVINSON No.32L pre-amplifier.
No.1152. Marantz PM-14SA pre-main amplifier.
Taking a lesson from the past. Record player with wire recorder, CRESCENT Model H-1A.
DVD audio format Ver.1.0.
SACD format Ver.1.0.
CD "ALL OF ME/Akitoshi Igarashi" and JVC"DIGITAL K2".
Practical live recording techniques No.50. NEUTRIK's convenient tool - Multifunctional audio generator.
Complete measurement series 51. Audit and measure the Audio Craft PE5500 phono equalizer.
Followup study on Taylor203B amplifier. [ remodel to 211/845 and general data ].
Experimental transistor design course. Practical techniques. Chapter 8 Design of stabilized power source (6).
7
Memorial amplifier for Mr. Kazuma Takesue. 2. Prototype 2A3single power amplifier.
Combination with a small output amplifier. WE-211E singlebooster amplifier.
Low-cost 10W power complex tube. 6EM7PP power amplifier.
45W*2 6L6GC p-p power amplifier.
3-channel 3-way all horn system. (1). EV 30cm*2 woofer horn.
3-tube interlocking single amplifier using a large transmissiontube and beam tube. (2). Distortion damping for a main powertube 813.
845 single amplifier based on the merit of choke-input half-wavedouble-voltage rectifying circuit.
Walking path of audio measurement. Measurement of leakage fluxfor power transformers. Part 2.
Marantz DR-17 CD recorder using Philips' high-grade mechanismsand key devices.
ELAC CL310JET loudspeaker system using 6.5mm-thick extrudedaluminum enclosure.
DENON DMD-S10MD recorder giving full play to 24bit ability inrecording of live music.
Dynavector DV-20XL/H MC cartridge featured by clear completedsound by adopting an aluminum cut body.
Sony SCD-1 SACD player expected to open the new door of the audioCD world.
Pioneer PDR-D7 recorder developed as audio CD recorder forprivate use.
MD deck MDS-JA33ES with Sony ATRAC DSP Type-R.
Perfect measurement series. 52. Listening and measurement ofUnison Research's Mistero Due line amplifier.
Design and fabrication of 24bit 96kHz DAC board. Study on ahandmade DA converter. Part 2. Basic concept continued.
Experimental design lecture for transistor amplifiers. Practicaltechniques.
8
New design of a gapless OPT with DC magnetization extinction circuit ! Production of a single non-feedback amplifier, used the famous vacuum tube, 'RS-237', made by the Telefunken AG. 1.
Option on two types of OPT by using a chassis kit. Production of a 2E22 single power amplifier.
Further following of a direct heating beam tube, 1619, of 1,000 yen per a tube. Production of a triode/beam tube exchangeable 1619 PP power amplifier.
Production of an extremely simple V-FET power amplifier drivable with only one operation amplifier. Bias circuit does not need any adjustment owing to use LED.
Production of 6CK4PP power amplifier with balanced combination of output tube and OPT.
Reconstruction to front-to-back symmetry strain type by using commercial unit. Aiming at more natural sound.
Production of three channel and three way all-horn system. 2. Production of a horn for middle tone, JBL 2440.
Over dumping does not allow to rise sound! A speaker should be driven at constant voltage. Difference between a constant voltage amplifier and a constant current amplifier must be considered.
A walking way on audio measurement. Role of a condenser at a viewpoint of rectification source waveform.
Scramble report No.1158. Listening under combination with the Simply Phono. Unison Research S2 pre- and main amplifier.
Scramble report No.1159. High grade sounds obtained by using goodness of an independent three heds mechanism. Nakamichi DR-10 three heds cassette deck.
Scramble report No.1160. Three kinds of cables giving a presentiment of new age sound. Audio-quest Topaz. Monitor PA-9745 and PA-9784.
The Oni-Daiko-za/Doto-Banri using 1 inch analogue master. Listening at 'Digital K2', a direct cut CD.
Lectures on practical and direct recording tecnique. 52. Trend on recent source outlet. A source tap must be used for each application.
A CD player capable to play back HDCD. Concept on Marantz DR-17. Actual measurement of block error rate and round jitter.
Design and production of a DAC board in response to HDCD activating the Barbrown PCM-1732. 1.
How can an acoustic signal be compressed ? 1. Symbolization of musical sound and its compressing method.
Reality and scope on progressive/interlace and DVD. Adoption of high grade image video by high end audio fan.
Details on SRS-Z1, an active speaker system of the Sonny Corp. adopting a full range unit with 39 mm in diameter.
Lecture on design of experimental transistor amplifier. Actual use.
A key for reproduction of analogue disc. History of cartridge and its technology. Tales on the cartridge. 108.
9
Making-up of a KT-66S, universal amplifier. Making-up of a KT-66UL, single power amplifier in response to various vacuum tubes as a universal machine.
Making-up of a WE-396A, parallel PP power amplifier. Making-up of a WE-396A parallel PP mini power amplifier comfortable for near field as a desk-top amplifer.
Birth progress of a constant current type amplifier.
Trial making-up of a non-final type constant current amplifier.
Reconfirmation of goodness in the inversion amplifier. Following trial making-up of JBL SA600 power amplifier.
Making-up of EL34+4P55, a three tube linking 813 single amplifier. Final.
Making-up of a three channel power amplifier having internally a channel divider for three-channel and three-way horn system. 1.
Design and making-up of a DAC board in response to HDCD activating Bar Brown PCM1732. 2.
An experimental lecture on design a transistor amplifier. Part on actual technology. Chapter 8. Design of a stabilizing electric source. 9.
A new product scramble report. Possible to store and play 300 + 1 = 301 sheets of CD. A file type CD player, Pioneer PD-F100.
A new product scramble report. Possible to expect more result than invested cost. Audio Quest SA400, a silver speaker cable.
A new product scramble report. High grade sounds impossible to imagine from its prise. B&W DM-601S2 and DM-602S2.
A new product scramble report. Rich expression power impossible to image to be a compact machine. Alchemist TURTLE DA, a converter.
A practical lecture on native recording technique. 53. From light to coaxial, and vice versa. A data vonversion box convenient for edition.
A noise flower level. Accuphase P-1000, a stereo power amplifier realized of 150 dB. Guarantee feature and tone with actual power. A circuit construction with high stability and high S/N ratio.
Tone and structure of aluminum electrolytic capacitor. A large effect of vibration beyond expectation.
Thorough measurement series. 53. Measurement of a quick silver tube type phono equalizer through its listening.
Aiming of break through from uni-wave. A preface to MFB system.
How can an acoustic signal be compressed ? 2. A coding processing method in MPEG2-AAC.
A key on analogue disc reproduction. History of the cartridge and its technology. Tales on a cartridge. 109.
Friendly vibration engineering. Tales on vibration, wave, and sound. 26. How to make a sound absorption wall.
10
New design of an OPT with a DC magnetization negative circuit and without gap ! Making-up of the famous Telefunken RS-237 single non-feedback amplifier. 2.
Aiming to reproduce the Futterman amplifier. Making-up of a 12B4A low RL OTL power amplifier.
Enjoying of sounds of the Western Electric, Inc. Making-up of WE-101D-PP power amplifier.
An experimental report on MFB. Reformation of a unit RG-W1 and making-up of MFB adapter.
For listening a LP record with one's own familiar friends. Stabilization of up-and-down vibration by magnetic force, and also compensation of tracking error. Makin-up of a yarn hanging rotary bed arm.
Investigation of possibility on reproduction of a duplicate low sound.
Making-up of a three channel power amplifier with internal channel divider for three-channel, three-way horn system. 2.
A wlking way on testing of audio. A relationship between voltage variation of electric source and input signal.
An experimental lecture on design of a transister amplifier. Actual use technology. Chapter 8. Design of stabilizing sources. 10.
The NS-U50 speaker system, Yamaha RP-U100 multimedia amplifier connectable to a prsonnal computer through USB interface and with A/D and D/A.
Freshness like enlargement of a room. CSE A-3000, a minus ion tweeter.
Reproduction of sound with delicate and gentle gross. WIRE WORLD Polaris III speaker cable.
Lecture on practical native recording technique. 54. A maintenance method of native recording apparatus without panic even at any accident.
A CD of 'CANDY/Akira Sugimura and Swing Cats' From recording to mix to DIGITAL K2 mastering.
Listening a constant current type amplifier. Nearly flat feature by rear opening.
A dual dynamic drive system three-way five speakers. Concept and internal structure of Teqnics SB-M800.
Tone improvement of a digital audio signal transmission circuit. An experiment of LVDS device.
How is an acoustic signal compressed ? 3. Evaluation of each compression method and reason of its tone difference.
A thorough testing series. 54. A special case. Detailed analysis on frequency features of QUAD type phono-equalizers.
Design and making-up of a DAC board responsible to HDCD activating the BarBrown PCM1732. 3.
11
Compensation of heater hum by using residual noise in directly heated tube. Making-up of an RS-237 single amplifier.
Trial making-up of a 50CA10 single stereo amplifier filled with Takesue-ism into a compact chassis.
Making-up of a headstand type single MOS-FET amplifier with distortion-extinction amplifier. 1.
Making-up of a 6GB8(T)PP amplifier recombined all front stages with vacuum tube resistor system.
A progress report on a combination of a Footerman amplifier improvement type OTL amplifier and three way horn type speaker system.
Making-up of a TR power amplifier for three channels and three ways horn system and for high tone. 3.
Let's listen to sounds of a constant current type amplifier. Trial making-up of an easy-making constant current adaptor.
An experimental report. 2. Actual testing features on an (improved) RG-W1.
Characteristics and tone quality of a CD-R to reseach for correlation between hard- and soft-wares.
Scramble reports. 1168. Malantz PM-17SA pre- to main-amplifier loaded an exclosive buffer amplifier to CD Rec-OUT
Scramble reports. 1169. Can be played a part to high technology cable? Audio-technica AT6S31 speaker cable.
Scramble reports. 1170. An ambitious product aiming at response to new generation source. Victor SX-L5 speaker system.
Practical lecture on native recording technique. 55. Practice on native recording on the Ban-etsu Saisen and the Kamahara Tetsudo railroads by following two rail lines of country railroad.
An concept and product development of Sharp SM-SX100, 1 bit amplifier showing a potential of high speed Delta Sigma 1 bit/DSD audio. With non-required radiant characteristic data.
A D/A device realizing the most simpleness and the highest precision. DSD to Analog converter. BarBrown DSP-1700 device.
Experimental lecture on design of a transister amplifier. Actual technology Division.
A thorough testing series. 55. Listening and testing on a stereo pri-amplifier of the Motzart .
A concourse in audio testing. Test of hum and noise at inside of an amplifier. Unexpectedly large electromagnetic induction of a PT.
A key on analogue disc. History of cartridge and its technology. Tales on a cartridge. 111.
Easy-understanding vibration engineering. Tales on vibration, wave, and sound. 28. Practice on making-up of an anechoic room and its characteristics.
12
Making-up of DAC using a D/A board adopting PCM 1732U in response to HDCD.
Making-up of 4033 single power amplifier capable of comforting unique characteristic for indirectly heated triode.
Reforming report on commercial pre- and main-amplifier. Incorporation of SA-600 type power amplifier.
Making-up of WE-141A type line amplifier with cathode follower, 600 ohm output and variable NF type gain control function. 1.
Study on a vacuum tube resistance system amplifier. Making-up of EL41(T)PP power amplifier.
Making-up of a strain-extinguishing amplifier added and headstand system single stage MOS-FET amplifier. 2.
Making-up of Assemblage DA-3DF converter kit using PCM 1704 and adopting a source transformer for each substrate.
Sounding two way system of LE-8T+AXIOM-80 using a cathode follower drive UV211 single.
An easy-operating experiment of MFB by using a double voice coil unit.
An experimental report. 3. Principle and practice on bridge detection MFB.
Scramble Report. No.1171. Malantz SM-17SA power amplifier with surprising performance for biamplifier drive.
Scramble Report. No.1172. Denon DCD-S10III-N CD player with highly dense sound inspite of its minor change.
Scramble Report. No.1173. Monitor PC Cobra6S/PC-9711 speaker cable giving an actual sense of 'a new sound wave in Europa'.
Scramble Report. No.1174. Tamura Seisakusho T75M1 power amplifier, 75 anniversary memorial model, using WE300B with para-single.
Scramble Report. No.1175. Technics SU-A808 pre- and main-amplifier with solid sound showing solid existence of Technics.
Practical lecture on native recording tecnique. 56. Comforting of a world in 24 bit/96 kHz using Mac. Enterance of digital edition using PC.
A three way SP system directing the next generation audio wide range. Concept and details on Victor SX-L5. Addition of full data such as polar pattern/accumulation spectrum and so forth.
Use of own new products for main body and LSI device. Development of Yamaha CDR1000.
Experimental lecture on design of transister amplifier. Actual technology part. Chapter 9. Design of non-linear analogue circuit. 2.
A thoroughly testing series. 56. Listening and testing on Audio Analogue 'Bellini' Preamplifier.
A walking road on Audio testing. How does a speaker work in a constant current type amplifier ? 1. Characteristics of the constant current type amplifier.
A key point on reproduction of analogue disc. Histry and technology on cartridge. Tales on the cartridge. 112.