Well I will be nice but I think every one has there opinion and either one of you guys have prove to me that disco was not around then. It always awhile before a style of music catches on and there are many types, style, and ways of playing music which is played different from one country to the next and one city to the next, because everything been done before.
You can't tell me you were in every night club across the USA back then cause you wouldn't have last very long no matter what color. Music groups change there styles every day. And not to change the subject but you can't tell me that Muddy Waters started the blues because he hear from some else who hear from some one else and so on. Prove it.
You can't tell me you were in every night club across the USA back then cause you wouldn't have last very long no matter what color. Music groups change there styles every day. And not to change the subject but you can't tell me that Muddy Waters started the blues because he hear from some else who hear from some one else and so on. Prove it.
Mr Pass,
This is very interesting, I recall at the time SAE amps were noted for their low thd at high frequencies and smooth subjective performance.
Perhaps this thread may pre empt your Bio or even an anothology of Pass amplifier designs in the form of a book.
I'm sure it would be a best seller.
Cheers
macka
This is very interesting, I recall at the time SAE amps were noted for their low thd at high frequencies and smooth subjective performance.
Perhaps this thread may pre empt your Bio or even an anothology of Pass amplifier designs in the form of a book.
I'm sure it would be a best seller.
Cheers
macka
Mr. Pass
Since we are talking '70's jap circuits, how good were the Kenwood L70 amps? Did they use the Hirota circuit? Do you know if Kenwood use that circuit in any of their amps, integrateds included?
FBJ
...this just in. The 4/4 bass drum beat of disco has been discovered to have originated in the deep south on Jan 1 1972 when a local man repeatedly kicked his large malfunctioning 'still which was needed to provide the village with New Year's celebratory imbibement. Southerners are a resourceful bunch so the infectuous beat of the kicks on the big kettle prompted spurious dancing. The music was then adopted by Northern R&B producers who were in the area visiting their parents😉
Since we are talking '70's jap circuits, how good were the Kenwood L70 amps? Did they use the Hirota circuit? Do you know if Kenwood use that circuit in any of their amps, integrateds included?
FBJ
...this just in. The 4/4 bass drum beat of disco has been discovered to have originated in the deep south on Jan 1 1972 when a local man repeatedly kicked his large malfunctioning 'still which was needed to provide the village with New Year's celebratory imbibement. Southerners are a resourceful bunch so the infectuous beat of the kicks on the big kettle prompted spurious dancing. The music was then adopted by Northern R&B producers who were in the area visiting their parents😉
My error. It is the Sano circuit, patent # 4,115,739
by Sano, Hirosha, Hirota.
Brilliant piece of work, wish I'd thought of it.
One of these days I will definitely make a project out
of it.
Assigned to Matsushita, I believe, so only used by
Technics (Panasonic). I'm not at all sure they used
it at all, although I have seen posts on the SS forum
asserting that it did exist.
Like my bio would be a best seller. 🙄
Yes, and Karen loves to dance. 🙂
by Sano, Hirosha, Hirota.
Brilliant piece of work, wish I'd thought of it.
One of these days I will definitely make a project out
of it.
Assigned to Matsushita, I believe, so only used by
Technics (Panasonic). I'm not at all sure they used
it at all, although I have seen posts on the SS forum
asserting that it did exist.
Like my bio would be a best seller. 🙄
Yes, and Karen loves to dance. 🙂
Mr. Pass
No comment on the Kenwood L70's monoblocks? They were supposed to be better than the best Sansui's but I was too young to hear either of them. I have been told that the Sansuis were edgy and brittle on the high end and that the Kenwoods better. It would have been nice to hear your opinion since I respect your ear nearly as much as your ingenuity.
What made the Sano circuit so special? How scalable is (was) it? Are the components (devices) to put it together still on the market?
No comment on the Kenwood L70's monoblocks? They were supposed to be better than the best Sansui's but I was too young to hear either of them. I have been told that the Sansuis were edgy and brittle on the high end and that the Kenwoods better. It would have been nice to hear your opinion since I respect your ear nearly as much as your ingenuity.
What made the Sano circuit so special? How scalable is (was) it? Are the components (devices) to put it together still on the market?
My first amp was 1.5W amp with four transistors. It used a pair of Germanium transistors for the output stage and I had to wind my own emmitter resistors by hand with Konstantan wire 🙂. And, yes, I used 10% carbon resistors too (I savaged them from a defunct TV set). The amp worked with a 9V battery (and good luck). It was hooked to a radio to listen to rock music, but it sadly never sounded up to my expectations.
( - and it was terribly ugly too!)
So it went into a scrapbox, which I recently rediscovered in the attic and from where I digged it out still in working order (more or less - better not try it) !
Greetings from 1972.
Klaus
( - and it was terribly ugly too!)
So it went into a scrapbox, which I recently rediscovered in the attic and from where I digged it out still in working order (more or less - better not try it) !
Greetings from 1972.
Klaus
My first amp was a Radio Shack P-Box kit, the OTL power amp. It used a power germanium output (PNP. The input and driver were PNP and NPN respectively). The speaker was directly connected to the output transistor (yup, no capacitor!) and B-. That's right! B-! The positive was the ground. That was OK, the 100 in One kit had PNP germaniums, so it worked out in my radio projects.
It could only use 6 volts. Any more voltage and it couldn't work. Don't ask me how it worked, I could never figure it out. I vaguely recall the schematic. My one and only thought was that because the voltage was so low, the speaker was the actual load, like an inductive load.
If you wanted to hear true harmonics distortion, that amp was the one. It actually sounded like it oscillated while sound was coming through, but only at certain frequencies. For the longest time when listening to "Silly Love Songs" by Wings, I used to think that there was a ~600 Hz whine in the middle when they are singing "I love you" and there was bass, percussion, and alto sax. But I found out it was really about a ~200 Hz bass note. Oddly enough, I liked the sound at the time.
I then rebuilt my father's old tube console stereo TV. The rest is history.
Gabe
It could only use 6 volts. Any more voltage and it couldn't work. Don't ask me how it worked, I could never figure it out. I vaguely recall the schematic. My one and only thought was that because the voltage was so low, the speaker was the actual load, like an inductive load.
If you wanted to hear true harmonics distortion, that amp was the one. It actually sounded like it oscillated while sound was coming through, but only at certain frequencies. For the longest time when listening to "Silly Love Songs" by Wings, I used to think that there was a ~600 Hz whine in the middle when they are singing "I love you" and there was bass, percussion, and alto sax. But I found out it was really about a ~200 Hz bass note. Oddly enough, I liked the sound at the time.
I then rebuilt my father's old tube console stereo TV. The rest is history.
Gabe
Perhaps somebody here will be so kind as to post the
cover page diagram of the Sano amp (ref # above), since
I don't have a copy and am inept with graphics anyway.
It took me 5 tries on the last schematic.
The Sano circuit used two power amplifiers, one a low voltage
complementary follower biased at very high levels, say 5
amps or so, whose power supply ground is driven by a
beefy Class AB amp following the same signal. The supply of
the Class A stage rides the output of the big amp, and you
get an efficient Class A stage with high power and high
bias.
cover page diagram of the Sano amp (ref # above), since
I don't have a copy and am inept with graphics anyway.
It took me 5 tries on the last schematic.
The Sano circuit used two power amplifiers, one a low voltage
complementary follower biased at very high levels, say 5
amps or so, whose power supply ground is driven by a
beefy Class AB amp following the same signal. The supply of
the Class A stage rides the output of the big amp, and you
get an efficient Class A stage with high power and high
bias.
disco. smisco
Hmmm: it was looking to me like someone was talking about "disco" music was first played and someone else was talking about when the word "disco" was first used to describe the music?
I agree with Karen, shut up and dance.
Where's my Anita Ward extended play... Ring My Bell .....😀
Hmmm: it was looking to me like someone was talking about "disco" music was first played and someone else was talking about when the word "disco" was first used to describe the music?
I agree with Karen, shut up and dance.
Where's my Anita Ward extended play... Ring My Bell .....😀
First Built of Yours!!!!!!
are you happy, now
how do you do
how do you feel
- 😛 gro 😛 -
groman "FOR SALE" anyone
take the chance - my designs are often rely i-able
Nelson Pass said:
are you happy, now
how do you do
how do you feel
- 😛 gro 😛 -
groman "FOR SALE" anyone
take the chance - my designs are often rely i-able
Since this is a very interesting stuff, I've made a zip file containing the whole patent #4,115,739 stuff.
But the size of this file is about 900K, and my Internet connection is very (!) slow :-(, so if anyone wants to receive this file (one html page plus 16 jpegs), please let me know, so I can send it once and for all.
Marcello
But the size of this file is about 900K, and my Internet connection is very (!) slow :-(, so if anyone wants to receive this file (one html page plus 16 jpegs), please let me know, so I can send it once and for all.
Marcello
SANO Amplifier
When I read the first mention off this circuit
I was very surprised. In 1987 or 1988 I build
my first Class A circuit and it was one of these.
Before this I build various class B amps.
Philips kits, Edwin, Cressendo from Elektor,
stuff like that. Also made quite a few amps using
an IC called TDA2002 and later TDA2003 in various
configurations.
I had (still have) a 1982 article which I
had looked at lots of times, but somehow I never
came round to actually building the circuit.
So in 1987 I did. I remember not being able to
find the needed OpAmp, TDA 1034, so I replaced
this with a NE5534. After a few weeks (and a some
problems) this thing was finished and I used the
amp for quite some time.
My SANO was replaced, and collected dust until
2 or 3 years ago when I ripped it apart. I needed
some of the parts. So all I have left is one of the
veroboards. A picture of this board, sano1.jpg, is
in the attachment of this post.
Yesterday, I punched in the schematic (sano2.gif)
in simetrix. Since I ran in to the limits of simetrix
I removed/replaced a few parts to get a simulation
version (sano3.gif).
regards
When I read the first mention off this circuit
I was very surprised. In 1987 or 1988 I build
my first Class A circuit and it was one of these.
Before this I build various class B amps.
Philips kits, Edwin, Cressendo from Elektor,
stuff like that. Also made quite a few amps using
an IC called TDA2002 and later TDA2003 in various
configurations.
I had (still have) a 1982 article which I
had looked at lots of times, but somehow I never
came round to actually building the circuit.
So in 1987 I did. I remember not being able to
find the needed OpAmp, TDA 1034, so I replaced
this with a NE5534. After a few weeks (and a some
problems) this thing was finished and I used the
amp for quite some time.
My SANO was replaced, and collected dust until
2 or 3 years ago when I ripped it apart. I needed
some of the parts. So all I have left is one of the
veroboards. A picture of this board, sano1.jpg, is
in the attachment of this post.
Yesterday, I punched in the schematic (sano2.gif)
in simetrix. Since I ran in to the limits of simetrix
I removed/replaced a few parts to get a simulation
version (sano3.gif).
regards
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