On Tue, 6 Jan 2004 17:49:04 +0000 (UTC), (Stewart
Pinkerton) wrote:

On Tue, 06 Jan 2004 13:17:05 GMT, wrote:

Hitachi marketed a line of MOSFET amps prior to Hafler, I think. My
mind is really rusty (the 60's you know), but I think they were the
7500 and 8500 or so.

That's correct, they were demonstration pieces for Hitachi FETs.

Soundcraftsmen might have also predated the Hafler with its MA5502 and
was concurrent with the Hitachi 8500 (both started in 1977). I'm not
100% positive that it was a MOSFET amp though, because I can't find
any confirmation of this. My old Soundcraftsmen brochures were lost in
a move.

Anyone know for sure?

On Tue, 6 Jan 2004 17:49:04 +0000 (UTC), (Stewart
Pinkerton) wrote:

On Tue, 06 Jan 2004 13:17:05 GMT, wrote:

Hitachi marketed a line of MOSFET amps prior to Hafler, I think. My
mind is really rusty (the 60's you know), but I think they were the
7500 and 8500 or so.

That's correct, they were demonstration pieces for Hitachi FETs.

Soundcraftsmen might have also predated the Hafler with its MA5502 and
was concurrent with the Hitachi 8500 (both started in 1977). I'm not
100% positive that it was a MOSFET amp though, because I can't find
any confirmation of this. My old Soundcraftsmen brochures were lost in
a move.

Anyone know for sure?

On Tue, 6 Jan 2004 17:49:04 +0000 (UTC), (Stewart
Pinkerton) wrote:

On Tue, 06 Jan 2004 13:17:05 GMT, wrote:

Hitachi marketed a line of MOSFET amps prior to Hafler, I think. My
mind is really rusty (the 60's you know), but I think they were the
7500 and 8500 or so.

That's correct, they were demonstration pieces for Hitachi FETs.

Soundcraftsmen might have also predated the Hafler with its MA5502 and
was concurrent with the Hitachi 8500 (both started in 1977). I'm not
100% positive that it was a MOSFET amp though, because I can't find
any confirmation of this. My old Soundcraftsmen brochures were lost in
a move.

Anyone know for sure?

"Sockpuppet Yustabe" said:

I assume you are talking about Cary single ended power amps.

Having some experience with Carys, while they might have some
interesting sonical attributes, their concept sometimes sucks.
They're running those poor 300Bs over their plate power ratings, and
1200 uF right at the cathode of a Gz37 rectifier isn't healthy,
either.
They seemed to have learned since those days, however.

The distortion in a tube guitar amp comes from the preamp section,
not from the power amp.

Umm, not entirely.
There's a complex interaction between the speaker & housing, the
output transformer and the usually low to zero NFB, which provides the
certain brand's sound.
Hence the need for power soaks in practicing and studio use.

--
Sander deWaal
Vacuum Audio Consultancy

"Sockpuppet Yustabe" said:

I assume you are talking about Cary single ended power amps.

Having some experience with Carys, while they might have some
interesting sonical attributes, their concept sometimes sucks.
They're running those poor 300Bs over their plate power ratings, and
1200 uF right at the cathode of a Gz37 rectifier isn't healthy,
either.
They seemed to have learned since those days, however.

The distortion in a tube guitar amp comes from the preamp section,
not from the power amp.

Umm, not entirely.
There's a complex interaction between the speaker & housing, the
output transformer and the usually low to zero NFB, which provides the
certain brand's sound.
Hence the need for power soaks in practicing and studio use.

--
Sander deWaal
Vacuum Audio Consultancy

"Sockpuppet Yustabe" said:

I assume you are talking about Cary single ended power amps.

Having some experience with Carys, while they might have some
interesting sonical attributes, their concept sometimes sucks.
They're running those poor 300Bs over their plate power ratings, and
1200 uF right at the cathode of a Gz37 rectifier isn't healthy,
either.
They seemed to have learned since those days, however.

The distortion in a tube guitar amp comes from the preamp section,
not from the power amp.

Umm, not entirely.
There's a complex interaction between the speaker & housing, the
output transformer and the usually low to zero NFB, which provides the
certain brand's sound.
Hence the need for power soaks in practicing and studio use.

--
Sander deWaal
Vacuum Audio Consultancy

In rec.audio.tech Sander deWaal wrote:
"Sockpuppet Yustabe" said:

I assume you are talking about Cary single ended power amps.

Having some experience with Carys, while they might have some
interesting sonical attributes, their concept sometimes sucks.
They're running those poor 300Bs over their plate power ratings, and
1200 uF right at the cathode of a Gz37 rectifier isn't healthy,
either.
They seemed to have learned since those days, however.

Should have learned sooner as it's not rocket science.

In rec.audio.tech Sander deWaal wrote:
"Sockpuppet Yustabe" said:

I assume you are talking about Cary single ended power amps.

Having some experience with Carys, while they might have some
interesting sonical attributes, their concept sometimes sucks.
They're running those poor 300Bs over their plate power ratings, and
1200 uF right at the cathode of a Gz37 rectifier isn't healthy,
either.
They seemed to have learned since those days, however.

Should have learned sooner as it's not rocket science.

In rec.audio.tech Sander deWaal wrote:
"Sockpuppet Yustabe" said:

I assume you are talking about Cary single ended power amps.

Having some experience with Carys, while they might have some
interesting sonical attributes, their concept sometimes sucks.
They're running those poor 300Bs over their plate power ratings, and
1200 uF right at the cathode of a Gz37 rectifier isn't healthy,
either.
They seemed to have learned since those days, however.

Should have learned sooner as it's not rocket science.

said:

Having some experience with Carys, while they might have some
interesting sonical attributes, their concept sometimes sucks.
They're running those poor 300Bs over their plate power ratings, and
1200 uF right at the cathode of a Gz37 rectifier isn't healthy,
either.
They seemed to have learned since those days, however.

Should have learned sooner as it's not rocket science.

Yup, in the old days, they wouldn't have sold a single one.

--
Sander deWaal
Vacuum Audio Consultancy

said:

Having some experience with Carys, while they might have some
interesting sonical attributes, their concept sometimes sucks.
They're running those poor 300Bs over their plate power ratings, and
1200 uF right at the cathode of a Gz37 rectifier isn't healthy,
either.
They seemed to have learned since those days, however.

Should have learned sooner as it's not rocket science.

Yup, in the old days, they wouldn't have sold a single one.

--
Sander deWaal
Vacuum Audio Consultancy

said:

Having some experience with Carys, while they might have some
interesting sonical attributes, their concept sometimes sucks.
They're running those poor 300Bs over their plate power ratings, and
1200 uF right at the cathode of a Gz37 rectifier isn't healthy,
either.
They seemed to have learned since those days, however.

Should have learned sooner as it's not rocket science.

Yup, in the old days, they wouldn't have sold a single one.

--
Sander deWaal
Vacuum Audio Consultancy

said:

Having some experience with Carys, while they might have some
interesting sonical attributes, their concept sometimes sucks.
They're running those poor 300Bs over their plate power ratings, and
1200 uF right at the cathode of a Gz37 rectifier isn't healthy,
either.
They seemed to have learned since those days, however.

Should have learned sooner as it's not rocket science.

Yup, in the old days, they wouldn't have sold a single one.

--
Sander deWaal
Vacuum Audio Consultancy

In rec.audio.tech Sander deWaal wrote:
said:

Having some experience with Carys, while they might have some
interesting sonical attributes, their concept sometimes sucks.
They're running those poor 300Bs over their plate power ratings, and
1200 uF right at the cathode of a Gz37 rectifier isn't healthy,
either.
They seemed to have learned since those days, however.

Should have learned sooner as it's not rocket science.

Yup, in the old days, they wouldn't have sold a single one.

They might have sold a few, but wouldn't have been around to sell more.

Things should still be that way, alas..............

In rec.audio.tech Sander deWaal wrote:
said:

Having some experience with Carys, while they might have some
interesting sonical attributes, their concept sometimes sucks.
They're running those poor 300Bs over their plate power ratings, and
1200 uF right at the cathode of a Gz37 rectifier isn't healthy,
either.
They seemed to have learned since those days, however.

Should have learned sooner as it's not rocket science.

Yup, in the old days, they wouldn't have sold a single one.

They might have sold a few, but wouldn't have been around to sell more.

Things should still be that way, alas..............

In rec.audio.tech Sander deWaal wrote:
said:

Having some experience with Carys, while they might have some
interesting sonical attributes, their concept sometimes sucks.
They're running those poor 300Bs over their plate power ratings, and
1200 uF right at the cathode of a Gz37 rectifier isn't healthy,
either.
They seemed to have learned since those days, however.

Should have learned sooner as it's not rocket science.

Yup, in the old days, they wouldn't have sold a single one.

They might have sold a few, but wouldn't have been around to sell more.

Things should still be that way, alas..............

In rec.audio.tech Sander deWaal wrote:
said:

Having some experience with Carys, while they might have some
interesting sonical attributes, their concept sometimes sucks.
They're running those poor 300Bs over their plate power ratings, and
1200 uF right at the cathode of a Gz37 rectifier isn't healthy,
either.
They seemed to have learned since those days, however.

Should have learned sooner as it's not rocket science.

Yup, in the old days, they wouldn't have sold a single one.

They might have sold a few, but wouldn't have been around to sell more.

Things should still be that way, alas..............

dave weil wrote:

On Tue, 6 Jan 2004 17:49:04 +0000 (UTC), (Stewart
Pinkerton) wrote:

On Tue, 06 Jan 2004 13:17:05 GMT, wrote:

Hitachi marketed a line of MOSFET amps prior to Hafler, I think. My
mind is really rusty (the 60's you know), but I think they were the
7500 and 8500 or so.

That's correct, they were demonstration pieces for Hitachi FETs.

Soundcraftsmen might have also predated the Hafler with its MA5502 and
was concurrent with the Hitachi 8500 (both started in 1977). I'm not
100% positive that it was a MOSFET amp though, because I can't find
any confirmation of this. My old Soundcraftsmen brochures were lost in
a move.

Anyone know for sure?


As I recall, Sony, yech, was the first to market an integrated
amplifier, at least in the U.S., utilizing MOSFET outputs. It would have
been late 1975 or early 1976. I think these amps also had switching
power supplies. I clearly remember worrying how the upcoming amplifiers
would sound with my newly purchased ADS L500 speakers. That was when I
had a lot less to worry about. Several years later I purchased a Hafler
DH200 and found out that a well designed amp sounds good with good
speakers regardless of the design philosophy.

(Hey, isn't this where this thread started???)

dave weil wrote:

On Tue, 6 Jan 2004 17:49:04 +0000 (UTC), (Stewart
Pinkerton) wrote:

On Tue, 06 Jan 2004 13:17:05 GMT, wrote:

Hitachi marketed a line of MOSFET amps prior to Hafler, I think. My
mind is really rusty (the 60's you know), but I think they were the
7500 and 8500 or so.

That's correct, they were demonstration pieces for Hitachi FETs.

Soundcraftsmen might have also predated the Hafler with its MA5502 and
was concurrent with the Hitachi 8500 (both started in 1977). I'm not
100% positive that it was a MOSFET amp though, because I can't find
any confirmation of this. My old Soundcraftsmen brochures were lost in
a move.

Anyone know for sure?


As I recall, Sony, yech, was the first to market an integrated
amplifier, at least in the U.S., utilizing MOSFET outputs. It would have
been late 1975 or early 1976. I think these amps also had switching
power supplies. I clearly remember worrying how the upcoming amplifiers
would sound with my newly purchased ADS L500 speakers. That was when I
had a lot less to worry about. Several years later I purchased a Hafler
DH200 and found out that a well designed amp sounds good with good
speakers regardless of the design philosophy.

(Hey, isn't this where this thread started???)

dave weil wrote:

On Tue, 6 Jan 2004 17:49:04 +0000 (UTC), (Stewart
Pinkerton) wrote:

On Tue, 06 Jan 2004 13:17:05 GMT, wrote:

Hitachi marketed a line of MOSFET amps prior to Hafler, I think. My
mind is really rusty (the 60's you know), but I think they were the
7500 and 8500 or so.

That's correct, they were demonstration pieces for Hitachi FETs.

Soundcraftsmen might have also predated the Hafler with its MA5502 and
was concurrent with the Hitachi 8500 (both started in 1977). I'm not
100% positive that it was a MOSFET amp though, because I can't find
any confirmation of this. My old Soundcraftsmen brochures were lost in
a move.

Anyone know for sure?


As I recall, Sony, yech, was the first to market an integrated
amplifier, at least in the U.S., utilizing MOSFET outputs. It would have
been late 1975 or early 1976. I think these amps also had switching
power supplies. I clearly remember worrying how the upcoming amplifiers
would sound with my newly purchased ADS L500 speakers. That was when I
had a lot less to worry about. Several years later I purchased a Hafler
DH200 and found out that a well designed amp sounds good with good
speakers regardless of the design philosophy.

(Hey, isn't this where this thread started???)

dave weil wrote:

On Tue, 6 Jan 2004 17:49:04 +0000 (UTC), (Stewart
Pinkerton) wrote:

On Tue, 06 Jan 2004 13:17:05 GMT, wrote:

Hitachi marketed a line of MOSFET amps prior to Hafler, I think. My
mind is really rusty (the 60's you know), but I think they were the
7500 and 8500 or so.

That's correct, they were demonstration pieces for Hitachi FETs.

Soundcraftsmen might have also predated the Hafler with its MA5502 and
was concurrent with the Hitachi 8500 (both started in 1977). I'm not
100% positive that it was a MOSFET amp though, because I can't find
any confirmation of this. My old Soundcraftsmen brochures were lost in
a move.

Anyone know for sure?


As I recall, Sony, yech, was the first to market an integrated
amplifier, at least in the U.S., utilizing MOSFET outputs. It would have
been late 1975 or early 1976. I think these amps also had switching
power supplies. I clearly remember worrying how the upcoming amplifiers
would sound with my newly purchased ADS L500 speakers. That was when I
had a lot less to worry about. Several years later I purchased a Hafler
DH200 and found out that a well designed amp sounds good with good
speakers regardless of the design philosophy.

(Hey, isn't this where this thread started???)

"wß" wrote in message
...
As I recall, Sony, yech, was the first to market an integrated
amplifier, at least in the U.S., utilizing MOSFET outputs. It would have
been late 1975 or early 1976.

I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you
overlook the device construction difference, then I think Sony were the
first to use high power FET's in a power amp. Sony invented the VFET, the
Hitachi power MosFET's came later.

I think these amps also had switching power supplies.

Not AFAIK, mine has a two voltage levels for each rail if that's what you
mean, but it's not switch mode.

TonyP.

"wß" wrote in message
...
As I recall, Sony, yech, was the first to market an integrated
amplifier, at least in the U.S., utilizing MOSFET outputs. It would have
been late 1975 or early 1976.

I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you
overlook the device construction difference, then I think Sony were the
first to use high power FET's in a power amp. Sony invented the VFET, the
Hitachi power MosFET's came later.

I think these amps also had switching power supplies.

Not AFAIK, mine has a two voltage levels for each rail if that's what you
mean, but it's not switch mode.

TonyP.

"wß" wrote in message
...
As I recall, Sony, yech, was the first to market an integrated
amplifier, at least in the U.S., utilizing MOSFET outputs. It would have
been late 1975 or early 1976.

I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you
overlook the device construction difference, then I think Sony were the
first to use high power FET's in a power amp. Sony invented the VFET, the
Hitachi power MosFET's came later.

I think these amps also had switching power supplies.

Not AFAIK, mine has a two voltage levels for each rail if that's what you
mean, but it's not switch mode.

TonyP.

"wß" wrote in message
...
As I recall, Sony, yech, was the first to market an integrated
amplifier, at least in the U.S., utilizing MOSFET outputs. It would have
been late 1975 or early 1976.

I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you
overlook the device construction difference, then I think Sony were the
first to use high power FET's in a power amp. Sony invented the VFET, the
Hitachi power MosFET's came later.

I think these amps also had switching power supplies.

Not AFAIK, mine has a two voltage levels for each rail if that's what you
mean, but it's not switch mode.

TonyP.

On Wed, 7 Jan 2004 18:29:28 +1100, "Tony Pearce"
wrote:

"wß" wrote in message
...
As I recall, Sony, yech, was the first to market an integrated
amplifier, at least in the U.S., utilizing MOSFET outputs. It would have
been late 1975 or early 1976.

I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you
overlook the device construction difference, then I think Sony were the
first to use high power FET's in a power amp. Sony invented the VFET, the
Hitachi power MosFET's came later.

Actually, Siliconix invented the VFET, but theirs were mostly for RF
and small signal use, audio band power VFETs came later from both Sony
and Hitachi.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On Wed, 7 Jan 2004 18:29:28 +1100, "Tony Pearce"
wrote:

"wß" wrote in message
...
As I recall, Sony, yech, was the first to market an integrated
amplifier, at least in the U.S., utilizing MOSFET outputs. It would have
been late 1975 or early 1976.

I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you
overlook the device construction difference, then I think Sony were the
first to use high power FET's in a power amp. Sony invented the VFET, the
Hitachi power MosFET's came later.

Actually, Siliconix invented the VFET, but theirs were mostly for RF
and small signal use, audio band power VFETs came later from both Sony
and Hitachi.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On Wed, 7 Jan 2004 18:29:28 +1100, "Tony Pearce"
wrote:

"wß" wrote in message
...
As I recall, Sony, yech, was the first to market an integrated
amplifier, at least in the U.S., utilizing MOSFET outputs. It would have
been late 1975 or early 1976.

I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you
overlook the device construction difference, then I think Sony were the
first to use high power FET's in a power amp. Sony invented the VFET, the
Hitachi power MosFET's came later.

Actually, Siliconix invented the VFET, but theirs were mostly for RF
and small signal use, audio band power VFETs came later from both Sony
and Hitachi.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On Wed, 7 Jan 2004 18:29:28 +1100, "Tony Pearce"
wrote:

"wß" wrote in message
...
As I recall, Sony, yech, was the first to market an integrated
amplifier, at least in the U.S., utilizing MOSFET outputs. It would have
been late 1975 or early 1976.

I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you
overlook the device construction difference, then I think Sony were the
first to use high power FET's in a power amp. Sony invented the VFET, the
Hitachi power MosFET's came later.

Actually, Siliconix invented the VFET, but theirs were mostly for RF
and small signal use, audio band power VFETs came later from both Sony
and Hitachi.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

"Tony Pearce" said:

I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you
overlook the device construction difference, then I think Sony were the
first to use high power FET's in a power amp. Sony invented the VFET, the
Hitachi power MosFET's came later.

IIRC, Yamaha had an amp around that time (B1 or B2?) with 2SK77
MOSFETS. A giant beast, and those transistors looked like 2N3055s on
steroids (twice the size of a TO-3) . Cool!

--
Sander deWaal
Vacuum Audio Consultancy

"Tony Pearce" said:

I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you
overlook the device construction difference, then I think Sony were the
first to use high power FET's in a power amp. Sony invented the VFET, the
Hitachi power MosFET's came later.

IIRC, Yamaha had an amp around that time (B1 or B2?) with 2SK77
MOSFETS. A giant beast, and those transistors looked like 2N3055s on
steroids (twice the size of a TO-3) . Cool!

--
Sander deWaal
Vacuum Audio Consultancy

"Tony Pearce" said:

I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you
overlook the device construction difference, then I think Sony were the
first to use high power FET's in a power amp. Sony invented the VFET, the
Hitachi power MosFET's came later.

IIRC, Yamaha had an amp around that time (B1 or B2?) with 2SK77
MOSFETS. A giant beast, and those transistors looked like 2N3055s on
steroids (twice the size of a TO-3) . Cool!

--
Sander deWaal
Vacuum Audio Consultancy

"Tony Pearce" said:

I still have a Sony amp from 1975, but they used VFETS, not MOSFET's. If you
overlook the device construction difference, then I think Sony were the
first to use high power FET's in a power amp. Sony invented the VFET, the
Hitachi power MosFET's came later.

IIRC, Yamaha had an amp around that time (B1 or B2?) with 2SK77
MOSFETS. A giant beast, and those transistors looked like 2N3055s on
steroids (twice the size of a TO-3) . Cool!

--
Sander deWaal
Vacuum Audio Consultancy

On Thu, 1 Jan 2004 16:35:45 -0500, "Robert Morein"
wrote:

A happy 2004 to everyone, with best hopes for a safe earwax removal to Arny
and Stew.

Nice to see you clarifying why you are universally known as 'Moron'.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On Thu, 1 Jan 2004 16:35:45 -0500, "Robert Morein"
wrote:

A happy 2004 to everyone, with best hopes for a safe earwax removal to Arny
and Stew.

Nice to see you clarifying why you are universally known as 'Moron'.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On Thu, 1 Jan 2004 16:35:45 -0500, "Robert Morein"
wrote:

A happy 2004 to everyone, with best hopes for a safe earwax removal to Arny
and Stew.

Nice to see you clarifying why you are universally known as 'Moron'.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On Thu, 1 Jan 2004 16:35:45 -0500, "Robert Morein"
wrote:

A happy 2004 to everyone, with best hopes for a safe earwax removal to Arny
and Stew.

Nice to see you clarifying why you are universally known as 'Moron'.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

Stewart Pinkerton a écrit :

On Thu, 1 Jan 2004 16:35:45 -0500, "Robert Morein"
wrote:


A happy 2004 to everyone, with best hopes for a safe earwax removal to Arny
and Stew.


Nice to see you clarifying why you are universally known as 'Moron'.

Hey, Pinky Warrior give him a chance.

Stewart Pinkerton a écrit :

On Thu, 1 Jan 2004 16:35:45 -0500, "Robert Morein"
wrote:


A happy 2004 to everyone, with best hopes for a safe earwax removal to Arny
and Stew.


Nice to see you clarifying why you are universally known as 'Moron'.

Hey, Pinky Warrior give him a chance.

Stewart Pinkerton a écrit :

On Thu, 1 Jan 2004 16:35:45 -0500, "Robert Morein"
wrote:


A happy 2004 to everyone, with best hopes for a safe earwax removal to Arny
and Stew.


Nice to see you clarifying why you are universally known as 'Moron'.

Hey, Pinky Warrior give him a chance.