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Cracked open the AN UK M1 RIAA to check the tube compliment... nice NOS Philips 12ax7 and Ei Yugo late '70s ECC83.
Cracked open the AN UK M1 RIAA to check the tube compliment... nice NOS Philips 12ax7 and Ei Yugo late '70s ECC83.
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Pioneer SA 810 (SA 81 for Japan domestic market) the last integrated tube amplifier from Pioneer
www.youtube.com/user/sakamatra1
Year 1966 − 1969
Specifications
Amplifier parts
Tubes
4x 12 AX7
4x 7868
2x 6AN8
Frequency response 20 to 26,000 Hz
+/- 1 dB
Total Harmonic Distortion less than 0,5% (continuos power output)
Spurious Response rejection
better than 70 dB
Power output 66 Watts
Rated power output 30 Watts x 2
Speakers impedance 8 ohms, 16 ohms (switchable)
Preamplifier parts
Input Sensitivity/Impedance (1KHz for rated output)
TAPE HEAD 2.3 mV
PHONO (MAG / CERAMIC) 5.2 mV
MIC 1.3 mV
AUX 1.7 mV
MONITOR 170 mV
REC 170 mV
TAPE REC / PB 170 mV
Miscellaneous
Power Requirements 110v, 120v, 130v, 220v, 240v
Dimensions
390 x 147 x 327 mm / 15.4 x 5.8 x 12.9 inch
Weight 15 kg
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Sansui Solid State Stereophonic AU 999
Specifications
Year 1970
Power amplifier part
Effective output 70W/70W (4ohm)
80W/80W (8ohm)
Music power (IHF) 180W (4ohm)
140W (8ohm)
THD 0.4%
Cross modulation distortion 0.4%
Power Band Width (IHF) 10Hz - 30kHz
Frequency characteristic 5Hz - 100kHz
Stereo separation 50dB
A hum and a noise 100dB
Input sensitivity/impedance 1V/40kohm
Load impedance 4ohm-16ohm
Dumping factor 45 (8ohm)
Preamplifier part
Output power 1V
THD 0.1%
Frequency characteristic 15Hz - 70kHz
A hum and a noise (IHF) Phono1, 2:80dB
Mic:80dB
Tuner, Aux: 85dB
Input sensitivity Phono1, 2:2mV
Mic:3mV
Tuner, Aux, Tape mon (Pin/Din): 200mV
Sound-recording output Tape rec(Pin):200mV
Tape rec(Din):30mV
Tone control Bass: +12dB--8dB (20Hz)
Midrange: ±5dB (1kHz, 2kHz)
Treble: +12dB--8dB (20kHz)
Tone selector Bass:Defeat, 200Hz, 400Hz
Midrange:Defeat, 1kHz, 2kHz
Treble:Defeat, 6kHz, 3kHz
A low filter -20dB(20Hz)
A high filter -18dB(20kHz)
Muting −20dB
Miscellaneous
Power consumption 370W
Dimensions
Width 461.5x height 155x depth of 316mm
Weight 17.5kg
Option Wood case C-17
Installed in a preamplifier module, LEOPARD is a liquid crystal programmable spatial shaper developed for the National Ignition Facility. It uses patterned masks to smooth and modify the spatial shape of laser pulses. [More information]
Electronics hobby
Designing and building a high power amplifier capable of driving low impedance (as low as 2 Ohm’s @ 50 Vpp) loads.
www.diyaudio.com/ see alias FdW
History of DIY audio
Audio DIY came to prominence in the 50s to 60s, as audio reproduction was relatively new and the technology "complex," audio reproduction equipment, and in particular high performance equipment, was not offered at the retail level. Kits and designs were available for consumers to build their own equipment. Famous vacuum tube kits from Dynaco, Heathkit, and McIntosh, as well as solid state (transistor) kits from Hafler allowed for consumers to build their own hi fidelity systems. Books and magazines were published which explained new concepts regarding the design and operation of vacuum tube and (later) transistor circuits.
While audio equipment has become easily accessible in the current day and age, there still exists an interest in building one's own equipment, including amplifiers, speakers, preamplifiers, and even CD players and turntables. Today, a network of companies, parts vendors, and on-line communities exist to foster this interest. DIY is especially active in loudspeaker and in tube amplification. Both are relatively simple to design and fabricate without access to sophisticated industrial equipment. Both enable the builder to pick and choose between various available parts, on matters of price as well as quality, allow for extensive experimentation, and offer the chance to use exotic or highly labor-intensive solutions, which would be expensive for a manufacturer to implement, but only require personal labor by the DIYer, which is a source of satisfaction to them.
Electronics hobby
Designing and building a high power amplifier capable of driving low impedance (as low as 2 Ohm’s @ 50 Vpp) loads.
www.diyaudio.com/ see alias FdW
History of DIY audio
Audio DIY came to prominence in the 50s to 60s, as audio reproduction was relatively new and the technology "complex," audio reproduction equipment, and in particular high performance equipment, was not offered at the retail level. Kits and designs were available for consumers to build their own equipment. Famous vacuum tube kits from Dynaco, Heathkit, and McIntosh, as well as solid state (transistor) kits from Hafler allowed for consumers to build their own hi fidelity systems. Books and magazines were published which explained new concepts regarding the design and operation of vacuum tube and (later) transistor circuits.
While audio equipment has become easily accessible in the current day and age, there still exists an interest in building one's own equipment, including amplifiers, speakers, preamplifiers, and even CD players and turntables. Today, a network of companies, parts vendors, and on-line communities exist to foster this interest. DIY is especially active in loudspeaker and in tube amplification. Both are relatively simple to design and fabricate without access to sophisticated industrial equipment. Both enable the builder to pick and choose between various available parts, on matters of price as well as quality, allow for extensive experimentation, and offer the chance to use exotic or highly labor-intensive solutions, which would be expensive for a manufacturer to implement, but only require personal labor by the DIYer, which is a source of satisfaction to them.
Just added this bespoke, aluminium-cased Cinemag CMQEE-3440A step up transformer to my Audio Note M1 RIAA phono stage.
Electronics hobby
Designing and building a high power amplifier capable of driving low impedance (as low as 2 Ohm’s @ 50 Vpp) loads.
www.diyaudio.com/ see alias FdW
History of DIY audio
Audio DIY came to prominence in the 50s to 60s, as audio reproduction was relatively new and the technology "complex," audio reproduction equipment, and in particular high performance equipment, was not offered at the retail level. Kits and designs were available for consumers to build their own equipment. Famous vacuum tube kits from Dynaco, Heathkit, and McIntosh, as well as solid state (transistor) kits from Hafler allowed for consumers to build their own hi fidelity systems. Books and magazines were published which explained new concepts regarding the design and operation of vacuum tube and (later) transistor circuits.
While audio equipment has become easily accessible in the current day and age, there still exists an interest in building one's own equipment, including amplifiers, speakers, preamplifiers, and even CD players and turntables. Today, a network of companies, parts vendors, and on-line communities exist to foster this interest. DIY is especially active in loudspeaker and in tube amplification. Both are relatively simple to design and fabricate without access to sophisticated industrial equipment. Both enable the builder to pick and choose between various available parts, on matters of price as well as quality, allow for extensive experimentation, and offer the chance to use exotic or highly labor-intensive solutions, which would be expensive for a manufacturer to implement, but only require personal labor by the DIYer, which is a source of satisfaction to them.
Electronics hobby
Designing and building a high power amplifier capable of driving low impedance (as low as 2 Ohm’s @ 50 Vpp) loads.
www.diyaudio.com/ see alias FdW
History of DIY audio
Audio DIY came to prominence in the 50s to 60s, as audio reproduction was relatively new and the technology "complex," audio reproduction equipment, and in particular high performance equipment, was not offered at the retail level. Kits and designs were available for consumers to build their own equipment. Famous vacuum tube kits from Dynaco, Heathkit, and McIntosh, as well as solid state (transistor) kits from Hafler allowed for consumers to build their own hi fidelity systems. Books and magazines were published which explained new concepts regarding the design and operation of vacuum tube and (later) transistor circuits.
While audio equipment has become easily accessible in the current day and age, there still exists an interest in building one's own equipment, including amplifiers, speakers, preamplifiers, and even CD players and turntables. Today, a network of companies, parts vendors, and on-line communities exist to foster this interest. DIY is especially active in loudspeaker and in tube amplification. Both are relatively simple to design and fabricate without access to sophisticated industrial equipment. Both enable the builder to pick and choose between various available parts, on matters of price as well as quality, allow for extensive experimentation, and offer the chance to use exotic or highly labor-intensive solutions, which would be expensive for a manufacturer to implement, but only require personal labor by the DIYer, which is a source of satisfaction to them.
Japanese market
Specifications :
Year 1976
Display 3-Digit Mechanical Counter
Analog Needle Meters
Transport Sìngle Capsŧan
Transport Belt Drive (Capsŧan)
Direct Loading Auto Shut off
Tape Manual Tape Equalization
Chrome Tape Capability Ferro-Chrome Tape Capability Normal Tape Capability Manual Tape Type Selection
Head Configuration 2 Head Design 4 Track / 2 Channel
Connectivity 2 Mono Microphone Inputs RCA Input/Output Connectors Headphones
Preamplifier
Output-Level Control
Individual Input Level Controls
Individual Output Level Controls
Operation Mechanical Transport Control
Memory StopTimer Recording/PlaybackLine / Mic Input Select Indicators
Cassette Back Lighting
Peak Indicator
Record Noise Reduction Dolby-B Noise Reduction
Exterior
Front Loading Orientation Left
Silver Finish
Speed1â…ž ips - 4.76 cm/s
General
Stereo
Source :
Electronics hobby
Designing and building a high power amplifier capable of driving low impedance (as low as 2 Ohm’s @ 50 Vpp) loads.
www.diyaudio.com/ see alias FdW
History of DIY audio
Audio DIY came to prominence in the 50s to 60s, as audio reproduction was relatively new and the technology "complex," audio reproduction equipment, and in particular high performance equipment, was not offered at the retail level. Kits and designs were available for consumers to build their own equipment. Famous vacuum tube kits from Dynaco, Heathkit, and McIntosh, as well as solid state (transistor) kits from Hafler allowed for consumers to build their own hi fidelity systems. Books and magazines were published which explained new concepts regarding the design and operation of vacuum tube and (later) transistor circuits.
While audio equipment has become easily accessible in the current day and age, there still exists an interest in building one's own equipment, including amplifiers, speakers, preamplifiers, and even CD players and turntables. Today, a network of companies, parts vendors, and on-line communities exist to foster this interest. DIY is especially active in loudspeaker and in tube amplification. Both are relatively simple to design and fabricate without access to sophisticated industrial equipment. Both enable the builder to pick and choose between various available parts, on matters of price as well as quality, allow for extensive experimentation, and offer the chance to use exotic or highly labor-intensive solutions, which would be expensive for a manufacturer to implement, but only require personal labor by the DIYer, which is a source of satisfaction to them.
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Pioneer 4 Channel Receiver QX 4000
www.youtube.com/user/sakamatra1
Year 1974 − 1976
Specifications
FM Parts
Tuning range 87.5 − 108
Sensitivity (IHF) 2.2 micro volts
Equal wave selection 3 dB
Selectivity better than 40 dB
Image Frequency rejection better than 50 dB at 98 MHz
Spurious Response rejection better than 65 dB
Clear factor stereo better than 0.8% (100% Mod)
Stereo separation better than 40 dB
AM parts
Tuning range 525.5 − 1.605 KHz
Sensitivity (IHF) 1.5 micro volts
Equal wave selection (1000 KHz) better than 45 dB
Spurious Response rejection better than 50 dB
Amplifier parts
Continuos power output ( 1 KHz, 4 channels driven)
11 watts + 11 watts / 11 watts + 11 watts (4 ohms)
11 watts x 4 (4 ohms), 10 watts x 4 (8 ohms)
Power in the range of 20 to 20.000 Hz (2 channels driven)
10 watts + 10 watts / 10 watts + 10 watts (8 ohms),
Harmonic distortion less than 1 % (continuos power output)
Power Bandwidth (IHF) (4 channels driven)
15 to 20.000 Hz (8 ohm), harmonic distortion less than 1 %
Frequency Response 10 to 100.000 Hz +/- 3 dB
Dumping factor 40 ( 8 ohms 1 KHz)
Preamplifier parts
Input Sensitivity/Impedance (1KHz for rated output)
PHONO MAG 2.5 micro Volts/50 Kohms
TUNER 200 micro Volts/90 Kohms (4 Ch)
AUX 200 micro Volts/90 Kohms (4 Ch)
TAPE MONITOR 200 micro Volts/90 Kohms (4 Ch)
TAPE REC 200 micro Volts (4Ch)
TAPE REC DIN 35 micro Volts (4Ch)
Miscellaneous
Power Requirements 110v, 120v, 130v, 220v, 240v (switchable) 50 − 60 Hz
Power Consumption watts (max)
AC Outlets
Switched 1
Unswitched 1
Dimensions (overall) (w) x (h) x (d) mm
Weight without package kg
Just added this bespoke, aluminium-cased Cinemag CMQEE-3440A step up transformer to my Audio Note M1 RIAA phono stage.
Each of the two laser bays of the National Ignition Facility is 122 meters long and contains 96 beamlines. This side view of Laser Bay 1 shows the four-high laser transport beamline enclosures above the preamplifier support structure. Photo by Jacqueline McBride
The National Ignition Facility uses 48 preamplifier modules, or PAMs, each of which provides laser energy for four NIF beams. The PAM receives a very low energy (billionth of a joule) pulse from the master oscillator room and amplifies the pulse by a factor of about a million, to a millijoule. It then boosts the pulse once again to a maximum of about ten joules by passing the beam four times through a flashlamp-pumped rod amplifier. [More information]
Third time's a charm. I moved from the BAT VK-3, to the Classe 4L, to this little beauty, which I bought used.
It is kind of a nice combo of the VK-3, which has tubes but no remote, and the Classe, which is solid state, but with a remote. The CJ PV-14LS is a hybrid design with just two tubes, tiny little 6c4 mono guys. These are combined with FETs in the circuit. It has a pretty full-featured remote, too.
It came to me with Mullard tubes (pictured in the closeup). They aren't marked Mullard, but came from CJ with the assurance that they are Mullards (I've read similar stories more than once in the internet fora). These tubes were pretty hissy. I swapped the Mullards out for the Phillips JAN tubes that the seller also provided, and the hiss was much reduced.
Third time's a charm. I moved from the BAT VK-3, to the Classe 4L, to this little beauty, which I bought used.
It is kind of a nice combo of the VK-3, which has tubes but no remote, and the Classe, which is solid state, but with a remote. The CJ PV-14LS is a hybrid design with just two tubes, tiny little 6c4 mono guys. These are combined with FETs in the circuit. It has a pretty full-featured remote, too.
It came to me with Mullard tubes (pictured in the closeup). They aren't marked Mullard, but came from CJ with the assurance that they are Mullards (I've read similar stories more than once in the internet fora). These tubes were pretty hissy. I swapped the Mullards out for the Phillips JAN tubes that the seller also provided, and the hiss was much reduced.
Third time's a charm. I moved from the BAT VK-3, to the Classe 4L, to this little beauty, which I bought used.
It is kind of a nice combo of the VK-3, which has tubes but no remote, and the Classe, which is solid state, but with a remote. The CJ PV-14LS is a hybrid design with just two tubes, tiny little 6c4 mono guys. These are combined with FETs in the circuit. It has a pretty full-featured remote, too.
It came to me with Mullard tubes (pictured in the closeup). They aren't marked Mullard, but came from CJ with the assurance that they are Mullards (I've read similar stories more than once in the internet fora). These tubes were pretty hissy. I swapped the Mullards out for the Phillips JAN tubes that the seller also provided, and the hiss was much reduced.
ST-335 Tuner
SY-335 Preamplifier
SC-335 Power Amplifier
Yes the face plate has been cleaned. The is picture taken before hand so please ignore the nasty face plate.
By decades the Ham radios and Short Wave listeners in Brazil was impossibilited to import high quality radio equipments because taxes from a law to defend our local industry. Then we need to improve, in this shot looks me using american WWII radio receivers. In the left is a Bendix RA-1B aircraft radio receiver.I 'm talking in a CB Pony transeiver. Above Bendix is set a GP-23 (from the 60's), for only 49 Meters band and was made by the italian electronic engineer Jack Perolo, an expert in receivers and that wrotte many articles for Hamradio magazine and was colaborator of Popular Electronics in 60 meters band log stations. Perolo is also living in my country.
Just a boring picture of my stereo.
VMB•1 Monoblocks
VPC•1 Passive Preamplifier
VDA•1 Digital/Analog Converter
VAC•1 Power Supply
Von Schweikert VR-1's
VPI ARIES Scout / JMW-9
Kimber Kable PBJ's
Kimber Kable 8TC Speaker Cable
Ernesto Padilla and Don Browning, left to right seated, and Gaylen Erbert, standing, of Lawrence Livermore National Laboratory attend to the control console of the Master Oscillator Room (MOR) at the National Ignition Facility. NIF laser pulses are generated in the MOR from a compact laser oscillator cavity made of ytterbium-doped optical fiber laser. This laser generates low-energy laser pulses of just a few nanojoules (billionths of a joule) with a beam diameter of a few micrometers. The oscillator pulse is first frequency modulated to broaden its bandwidth (the number of colors making up the laser is increased) by a prescribed amount. This prevents damage to NIF's large optics, and in conjunction with a grating in the preamplifier module, smooths the intensity of the focused beam on the ignition target. This pulse is then split and amplified using fiber splitters and fiber amplifiers similar to those used in the telecommunications industry. After several stages of splitting and amplification, 48 individual pulses are generated. Each pulse is then individually shaped in time per the target experimental requirements and transported in separate fiber-optic cables to each of the 48 preamplifier modules for further amplification and beam shaping. NIF's master oscillator room has been in continuous operation since October 2001 and has operated for more than 6,000 hours. Special high-contrast pulses have been successfully generated on the master oscillator system, demonstrating that the pulse shaping system meets NIF's requirements for achieving ignition.
Sutherland Engineering Ph3D battery-powered phono stage. The Absolute Sound's "Phono stage of the Year," and "Editor's Choice."
Third time's a charm. I moved from the BAT VK-3, to the Classe 4L, to this little beauty, which I bought used.
It is kind of a nice combo of the VK-3, which has tubes but no remote, and the Classe, which is solid state, but with a remote. The CJ PV-14LS is a hybrid design with just two tubes, tiny little 6c4 mono guys. These are combined with FETs in the circuit. It has a pretty full-featured remote, too.
It came to me with Mullard tubes (pictured in the closeup). They aren't marked Mullard, but came from CJ with the assurance that they are Mullards (I've read similar stories more than once in the internet fora). These tubes were pretty hissy. I swapped the Mullards out for the Phillips JAN tubes that the seller also provided, and the hiss was much reduced.
Audio-gd P-2 features a digital volume control with remote control, there is no volume potentiometer which means both channels are perfectly matched. It also utilizes swappable voltage gain modules, there are at least seven or eight modules to choose from. The designer, Kingwa designed the P-2 to be modular throughout the circuitry. Like Mark Levinson's pre-amp, it shorts other inputs when one input is selected, resulting better SQ.
Just added this bespoke, aluminium-cased Cinemag CMQEE-3440A step up transformer to my Audio Note M1 RIAA phono stage.
Classe 30 Preamplifier,
Cambridge Audio Azur 340C CD Player,
Counterpoint Solid 1 stereo Amplifier,
Audioquest Ruby 3 Interconnect,
Audioquest Turquoise x 2 Interconnect,
Audioquest X2 Speaker cable,
Straight Wire Symphony II Interconnect,
Lovan Classic 1 Stand,
Sonus Faber Concertino Monitors
Totem Dreamcatcher Subwoofer
Amplifier: Audio Electronic Supply AE-25 Super Amp by Dennis J. Had running generic KT-88 tubes in triode mode (15W per channel)
Volume control and source select: Tisbury Audio Mini Passive Preamplifier
FM Radio: Dynaco FM-3 vacuum tube stereo receiver by Stuart Hageman, ca. 1964.
Digital Audio Source: Raspberry Pi B+ with HifiBerry Burr-Brown based DAC
CD Player: Sony CDP-XE520
Interconnects: AudioQuest Turquoise and Oehlbach BEAT!
Rack: Gecko Tower TOW400 4
Speakers: Mission SC-M5K
Speaker cable: Monster
Speaker stands: Target Hifi
Electronics hobby
Designing and building a high power amplifier capable of driving low impedance (as low as 2 Ohm’s @ 50 Vpp) loads.
www.diyaudio.com/ see alias FdW
History of DIY audio
Audio DIY came to prominence in the 50s to 60s, as audio reproduction was relatively new and the technology "complex," audio reproduction equipment, and in particular high performance equipment, was not offered at the retail level. Kits and designs were available for consumers to build their own equipment. Famous vacuum tube kits from Dynaco, Heathkit, and McIntosh, as well as solid state (transistor) kits from Hafler allowed for consumers to build their own hi fidelity systems. Books and magazines were published which explained new concepts regarding the design and operation of vacuum tube and (later) transistor circuits.
While audio equipment has become easily accessible in the current day and age, there still exists an interest in building one's own equipment, including amplifiers, speakers, preamplifiers, and even CD players and turntables. Today, a network of companies, parts vendors, and on-line communities exist to foster this interest. DIY is especially active in loudspeaker and in tube amplification. Both are relatively simple to design and fabricate without access to sophisticated industrial equipment. Both enable the builder to pick and choose between various available parts, on matters of price as well as quality, allow for extensive experimentation, and offer the chance to use exotic or highly labor-intensive solutions, which would be expensive for a manufacturer to implement, but only require personal labor by the DIYer, which is a source of satisfaction to them.
I've been playing through the Rocktron Piranha into a Yamaha power amp recently. At first I missed the EL34 power amp compression.
About 40 or so components were replaced and upgraded.
My Kenwood C1 Restomod project. Basically a recapping and also component upgrade. Credit where credit is due: I followed the path that Leestereo took: audiokarma.org/forums/index.php?threads/kenwood-basic-c1-...
Electronics hobby
Designing and building a high power amplifier capable of driving low impedance (as low as 2 Ohm’s @ 50 Vpp) loads.
www.diyaudio.com/ see alias FdW
History of DIY audio
Audio DIY came to prominence in the 50s to 60s, as audio reproduction was relatively new and the technology "complex," audio reproduction equipment, and in particular high performance equipment, was not offered at the retail level. Kits and designs were available for consumers to build their own equipment. Famous vacuum tube kits from Dynaco, Heathkit, and McIntosh, as well as solid state (transistor) kits from Hafler allowed for consumers to build their own hi fidelity systems. Books and magazines were published which explained new concepts regarding the design and operation of vacuum tube and (later) transistor circuits.
While audio equipment has become easily accessible in the current day and age, there still exists an interest in building one's own equipment, including amplifiers, speakers, preamplifiers, and even CD players and turntables. Today, a network of companies, parts vendors, and on-line communities exist to foster this interest. DIY is especially active in loudspeaker and in tube amplification. Both are relatively simple to design and fabricate without access to sophisticated industrial equipment. Both enable the builder to pick and choose between various available parts, on matters of price as well as quality, allow for extensive experimentation, and offer the chance to use exotic or highly labor-intensive solutions, which would be expensive for a manufacturer to implement, but only require personal labor by the DIYer, which is a source of satisfaction to them.
Sutherland Engineering Ph3D battery-powered phono stage. The Absolute Sound's "Phono stage of the Year."
Yamaha C-2 preamp
Yamaha P1600 power amp
Teac A-H500 integrated amp
Teac PD-H500 CD player
Jamo E825
NHT SuperTwo
After a wait of just over four months, my M1 RIAA has arrived, along with another set of 1m AN UK Lexus interconnects!
a new endeavor for me and a new level of build quality. I'm calling it 'Sercona Audio' (Sercona for 'Serial Controlled Audio'). the box is the 'Audio Controller 3' and its website (once fully constructed) will be www.sercona.net
it runs the Volu-Master arduino code base (along with the LCDuino style backpack CPU system) and acts as a line-level audio preamplifier, input selector and remote system controller (infrared learning remote, usb for pc/web control). of special note is the fact that switching can be done at both analog and digital (spdif) domains.
we plan to do a local manufacturing run to test the concept, with build, assembly and test all done locally to ensure the highest quality.
more info to come. questions and feedback welcome, too!
(work-in-progress) company website: www.sercona.net
After a wait of just over four months, my M1 RIAA has arrived, along with another set of 1m AN UK Lexus interconnects!
Electronics hobby
Designing and building a high power amplifier capable of driving low impedance (as low as 2 Ohm’s @ 50 Vpp) loads.
www.diyaudio.com/ see alias FdW
History of DIY audio
Audio DIY came to prominence in the 50s to 60s, as audio reproduction was relatively new and the technology "complex," audio reproduction equipment, and in particular high performance equipment, was not offered at the retail level. Kits and designs were available for consumers to build their own equipment. Famous vacuum tube kits from Dynaco, Heathkit, and McIntosh, as well as solid state (transistor) kits from Hafler allowed for consumers to build their own hi fidelity systems. Books and magazines were published which explained new concepts regarding the design and operation of vacuum tube and (later) transistor circuits.
While audio equipment has become easily accessible in the current day and age, there still exists an interest in building one's own equipment, including amplifiers, speakers, preamplifiers, and even CD players and turntables. Today, a network of companies, parts vendors, and on-line communities exist to foster this interest. DIY is especially active in loudspeaker and in tube amplification. Both are relatively simple to design and fabricate without access to sophisticated industrial equipment. Both enable the builder to pick and choose between various available parts, on matters of price as well as quality, allow for extensive experimentation, and offer the chance to use exotic or highly labor-intensive solutions, which would be expensive for a manufacturer to implement, but only require personal labor by the DIYer, which is a source of satisfaction to them.
Here is my "new" Revox A720 Tuner pre-amplifier. Actually it is older than me :)
Thank you Bernd for repairing this to me. Sound is perfect with 2 x Genelec 8020 and 7050B active loudspeaker set.
please visit
for more details
Pioneer SA 810 (SA 81 for Japan domestic market) the last integrated tube amplifier from Pioneer
www.youtube.com/user/sakamatra1
Year 1966 − 1969
Specifications
Amplifier parts
Tubes
4x 12 AX7
4x 7868
2x 6AN8
Frequency response 20 to 26,000 Hz
+/- 1 dB
Total Harmonic Distortion less than 0,5% (continuos power output)
Spurious Response rejection
better than 70 dB
Power output 66 Watts
Rated power output 30 Watts x 2
Speakers impedance 8 ohms, 16 ohms (switchable)
Preamplifier parts
Input Sensitivity/Impedance (1KHz for rated output)
TAPE HEAD 2.3 mV
PHONO (MAG / CERAMIC) 5.2 mV
MIC 1.3 mV
AUX 1.7 mV
MONITOR 170 mV
REC 170 mV
TAPE REC / PB 170 mV
Miscellaneous
Power Requirements 110v, 120v, 130v, 220v, 240v
Dimensions
390 x 147 x 327 mm / 15.4 x 5.8 x 12.9 inch
Weight 15 kg