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In 1976 Brian Powell founded Crimson.
In 1980 Crimson released the 510 Preamplifier.
In 2012 Brian designed an upgrade for the 510 Preamplifier (see link for details).
The photo shows my upgraded PCB.
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Marantz SR 800 Stereophonic Receiver
www.youtube.com/user/sakamatra1
Specifications
Year circa 1979
Radio FM stereo 87.5 to 108 MHz, AM 515-1650 kHz
Antenna connections FM 300 Ohm balanced, MW 75 ohms unbalanced.
Inputs Tape1/Monitor, Tape2/Aux, phono (MM) Output Tape 1
Headphone Jack 6.35mm
Equalization Loudness
Speaker groups A and / or B (depending on the impedance)
Amplifier Power at 4 (8) Imp Ohm to DIN 2 x 28W (23W)
Preamplifier frequency response 20Hz - 35kHz
Amplifier 10 Hz - 40 kHz
Power supply 220V/50Hz
Power consumption at idle 20W, rated up to 90W
Dimensions 47 cm x 14 cm x 32 cm
Weight about 6kg
Front plate metal, body wood panel and base made of a composite material.
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
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Sansui Solid State Amplifier AU 888
www.youtube.com/user/sakamatra1
Specifications
Year 1971
Output power
Music power (IHF) : 140W (4ohm)
100W (8ohm)
Effective output : 50/50W (4ohm)
45/45W (8ohm)
THD 0.4% or less (Output power)
Cross modulation distortion (SMPTE, 60Hz:7kHz=4:1) 0.4% or less (Output power)
Power Band Width (IHF) 10Hz - 40,000Hz (8ohm)
Frequency characteristic 10Hz - 70,000Hz, ±1dB
Channel separation 50dB or more (1kHz, Output power)
A hum and a noise (IHF) 100dB or more
Input sensitivity/impedance (an Output power, 1kHz) 1V/50kohm
Dumping factor 20 (8-ohm load intensity)
Load impedance 4ohm-16ohm
Preamplifier part
Output voltage Maximum output voltage: 4V
Output-power voltage: 1V
THD 0.1% (Output-power voltage)
Frequency characteristic 15Hz - 50,000Hz, and +0.5 -1.5 dB
Channel separation Phono:50dB
AUX:50dB
A hum and a noise (IHF) Phono1, 2:80dB or more
MIC: 80dB or more
Tuner, AUX: 85dB or more
Input sensitivity/impedance
(An Output-power voltage, 1kHz) Phono1:2mV/50kohm
Phono2:2mV/30kohm, 50kohm, 100kohm
MIC: 2mV / 50kohm
Tuner: 180mV / 100kohm
AUX: 180mV / 100kohm
Tape Mon(Pin): 180mV / 100kohm
Tape Recorder(Din): 180mV / 50kohm
Sound-recording output Tape Rec(Pin):180mV
Tape Recorder(Din):30mV
Tone control Bass: 20Hz+12 -8 dB (2dB step)
Midrange: 1,000Hz, 2,000Hz±5dB (1dB step)
Treble: 20,000Hz+12 -8 dB (2dB step)
Tone selector Midrange:Defeat, 1,000Hz, 2,000Hz
Loudness: +8dB (50Hz), +3dB (10,000Hz)
Switchpoint A high filter: 10,000Hz-8dB (12 dB/oct, NF type)
A low filter: 50Hz-8dB (12 dB/oct, NF type)
Muting: -20dB
Synthesis
Supply voltage 100V, 50Hz/60Hz
Power consumption 400W (at the time of the maximum input)
Miscellaneous
Dimensions Width 460x height 140x depth of 305mm
Weight 12.6kg
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Sansui solid state stereophonic amplifier AU 777 A
www.youtube.com/user/sakamatra1
Specifications
Year 1969
Output power
Music power (IHF): 70W±1dB (8ohm)
Effective output: 30W/30W±1dB (8ohm)
THD 0.5% or less
Cross modulation distortion (60Hz:7kHz=4:1) 0.8% or less
Power Band Width (IHF) 20Hz - 50000Hz (0.5% of distortion)
Frequency characteristic 20Hz - 100,000Hz, ±1dB
Channel separation 20dB or more (1000Hz)
A hum and a noise (IHF) 100dB or more (closed circuit)
Input sensitivity/impedance 1V / 300kohm (an Output power, 1kHz)
Dumping factor 15 (8ohms)
Load impedance 4ohm-16ohm
Center channel Output voltage Flat output: 10V (1kHz)
High cut output (fo = 159Hz): 10V (50Hz)
Preamplifier parts
Output voltage Maximum output voltage: 4V
Output-power voltage: 1V
THD 0.1% (Output-power voltage)
Frequency characteristic 20Hz - 70,000Hz, and +0.5 -1.5 dB
A hum and a noise (IHF, maximum output voltage) Phono1, 2:80dB or more (closed circuit)
MIC: 85dB or more (closed circuit)
Tuner: 85dB or more (open circuit)
AUX: 85dB or more (open circuit)
Input sensitivity/impedance
(An Output-power voltage, 1kHz) Phono1:2mV±3dB /, 50kohm
Phono2:2mV±3dB /, 30kohm, 50kohm, 100kohm
MIC: 3.5mV±3dB /, 50kohm
Tuner: 140mV±3dB /, 100kohm
AUX: 140mV±3dB /, 100kohm
Tape Mon(Pin): 140mV±3dB /, 100kohm
Tape Recorder(Din): 140mV±3dB /, 100kohm
Sound-recording output Tape Rec(Pin): 150mV±3dB
Tape Recorder(Din): 30mV±3dB
Control Bass: 20Hz±15dB (3dB step)
Midrange: 1,500Hz±5dB (1dB step)
Treble: 20,000Hz±15dB (3dB step)
Loudness (volume 30dB): 50Hz+8dB, 10,000Hz+2.5dB
Switchpoint A high filter: 20,000Hz-18dB (12 dB/oct)
A low filter: 20Hz-26dB (12 dB/oct)
Muting: -20dB
Synthesis
Stream composition 31Tr, 5Di
Miscellaneous
Supply voltage 220V, 50Hz/60Hz
Dimensions
Width 435x height 155x depth of 334mm
Weight 12.5kg
Option The wood case made from a walnut
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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
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.
please visit
for more details
Sansui Solid State Amplifier AU 888
www.youtube.com/user/sakamatra1
Specifications
Year 1971
Output power
Music power (IHF) : 140W (4ohm)
100W (8ohm)
Effective output : 50/50W (4ohm)
45/45W (8ohm)
THD 0.4% or less (Output power)
Cross modulation distortion (SMPTE, 60Hz:7kHz=4:1) 0.4% or less (Output power)
Power Band Width (IHF) 10Hz - 40,000Hz (8ohm)
Frequency characteristic 10Hz - 70,000Hz, ±1dB
Channel separation 50dB or more (1kHz, Output power)
A hum and a noise (IHF) 100dB or more
Input sensitivity/impedance (an Output power, 1kHz) 1V/50kohm
Dumping factor 20 (8-ohm load intensity)
Load impedance 4ohm-16ohm
Preamplifier part
Output voltage Maximum output voltage: 4V
Output-power voltage: 1V
THD 0.1% (Output-power voltage)
Frequency characteristic 15Hz - 50,000Hz, and +0.5 -1.5 dB
Channel separation Phono:50dB
AUX:50dB
A hum and a noise (IHF) Phono1, 2:80dB or more
MIC: 80dB or more
Tuner, AUX: 85dB or more
Input sensitivity/impedance
(An Output-power voltage, 1kHz) Phono1:2mV/50kohm
Phono2:2mV/30kohm, 50kohm, 100kohm
MIC: 2mV / 50kohm
Tuner: 180mV / 100kohm
AUX: 180mV / 100kohm
Tape Mon(Pin): 180mV / 100kohm
Tape Recorder(Din): 180mV / 50kohm
Sound-recording output Tape Rec(Pin):180mV
Tape Recorder(Din):30mV
Tone control Bass: 20Hz+12 -8 dB (2dB step)
Midrange: 1,000Hz, 2,000Hz±5dB (1dB step)
Treble: 20,000Hz+12 -8 dB (2dB step)
Tone selector Midrange:Defeat, 1,000Hz, 2,000Hz
Loudness: +8dB (50Hz), +3dB (10,000Hz)
Switchpoint A high filter: 10,000Hz-8dB (12 dB/oct, NF type)
A low filter: 50Hz-8dB (12 dB/oct, NF type)
Muting: -20dB
Synthesis
Supply voltage 100V, 50Hz/60Hz
Power consumption 400W (at the time of the maximum input)
Miscellaneous
Dimensions Width 460x height 140x depth of 305mm
Weight 12.6kg
please visit
for more details
Sansui Solid State Amplifier AU 888
www.youtube.com/user/sakamatra1
Specifications
Year 1971
Output power
Music power (IHF) : 140W (4ohm)
100W (8ohm)
Effective output : 50/50W (4ohm)
45/45W (8ohm)
THD 0.4% or less (Output power)
Cross modulation distortion (SMPTE, 60Hz:7kHz=4:1) 0.4% or less (Output power)
Power Band Width (IHF) 10Hz - 40,000Hz (8ohm)
Frequency characteristic 10Hz - 70,000Hz, ±1dB
Channel separation 50dB or more (1kHz, Output power)
A hum and a noise (IHF) 100dB or more
Input sensitivity/impedance (an Output power, 1kHz) 1V/50kohm
Dumping factor 20 (8-ohm load intensity)
Load impedance 4ohm-16ohm
Preamplifier part
Output voltage Maximum output voltage: 4V
Output-power voltage: 1V
THD 0.1% (Output-power voltage)
Frequency characteristic 15Hz - 50,000Hz, and +0.5 -1.5 dB
Channel separation Phono:50dB
AUX:50dB
A hum and a noise (IHF) Phono1, 2:80dB or more
MIC: 80dB or more
Tuner, AUX: 85dB or more
Input sensitivity/impedance
(An Output-power voltage, 1kHz) Phono1:2mV/50kohm
Phono2:2mV/30kohm, 50kohm, 100kohm
MIC: 2mV / 50kohm
Tuner: 180mV / 100kohm
AUX: 180mV / 100kohm
Tape Mon(Pin): 180mV / 100kohm
Tape Recorder(Din): 180mV / 50kohm
Sound-recording output Tape Rec(Pin):180mV
Tape Recorder(Din):30mV
Tone control Bass: 20Hz+12 -8 dB (2dB step)
Midrange: 1,000Hz, 2,000Hz±5dB (1dB step)
Treble: 20,000Hz+12 -8 dB (2dB step)
Tone selector Midrange:Defeat, 1,000Hz, 2,000Hz
Loudness: +8dB (50Hz), +3dB (10,000Hz)
Switchpoint A high filter: 10,000Hz-8dB (12 dB/oct, NF type)
A low filter: 50Hz-8dB (12 dB/oct, NF type)
Muting: -20dB
Synthesis
Supply voltage 100V, 50Hz/60Hz
Power consumption 400W (at the time of the maximum input)
Miscellaneous
Dimensions Width 460x height 140x depth of 305mm
Weight 12.6kg
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.
Top: Audio Research Reference Phone 3SE Phono Stage ($18k)
Bottom: Audio Research Reference 6SE preamplifier ($18k)
The analog board.
I happened to notice that the new caps were bigger then the older ones(most of them).I was expecting them to be smaller
Not 100% new.Some elna that i couldn't find.
A look at the DIGITAL board.It's the before shot with all the dust.I tagged the wires so I wouldn't make any mistakes.At this moment I still haven't turned it on.Fingers crossed :)))
NHT SuperTwo 3 way speakers
YAMAHA C-2 preamp
YAMAHA P1600 power amp
TEAC PD-H500 cdp
TEAC R-H500 tape
TEAC A-H500 integrated
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.
green = noise of 16 paralleled BF862 at 44 mA.
red = thermal noise of 60 Ohm resistor = 1nV/rtHz
The BF862 are 10 dB below 1nV or about 320 pV/rtHz
0 dB = 1nV/rtHz or -180 dBV.
Below 50 Hz the measurement is limited by the preamplifier.
All new video caps.I guess they'll do the job even if I don't use the video section.Decided to change them anyway
A picture of my Densen DM20 preamplifier. I took this in part exchange when selling my Exposure pre/power
Taken unawares by my roommate, at USAADS, McGregor Missile Range, NM, in '68
Not the gung-ho military sort. I wore my soldier suit as little as possible.
Hegel Room featuring Hegel, Acoustic Signature, and KEF speakers, including subwoofer. Sam Cooke's voice was lovely, and the system imaged extremely well. Instruments were very well layered. Low bass was what I would call decent, particularly for a small subwoofer. I found this to be a very listenable system.
A Hegel V10 phono preamplifier ($1.5k) sits on top of their Hegel integrated amplifier.
GRAAF an Italian made 20watt OTL amp base on 6c33. Something I dearly missed for more than 15 years suddenly show up today let me catch some memories. To bad it can't stay overnite ...
This is the microphone preamp for my simple circuit to display music on a VGA monitor like on an oscilloscope.
It is worth to note that this is not mounted on a PCB, rather I glued some red paper on the perfboard then opened the holes necessary with a needle.
For more details go to :
Sull'Etna vengono eseguite registrazioni audio infrasoniche. In foto un microfono a condensatore pre-polarizzato (sensibilità 50 mV/Pa), equipaggiato con preamplificatore (i due apparati hanno una risposta piatta nell'intervallo di frequenza 0.1-20000 Hz) utilizzati dalla Rete Infrasonica Permanente dell'Etna. /
On the Etna volcano are collected audio recordings in the infrasonic range. In the photo is a pre-polarized condenser microphone (sensitivity 50 mV/Pa), equipped with preamplifier (the system guarantees a flat response in the 0.1 - 20000 Hz frequency range) used by the Mt. Etna Permanent Infrasound Network.
Photo: Alfio Amantia
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.