In the same manner that, often for audio power output situations,
cheap 100V, 15amp TIP3055/TIP2955 with maybe a bit of change of mounting is
a perfectly servicable replacement for rare/expensive 2SA... / 2SC...
bipolar pairs.
Is there anything similarly for the same/similar wide plastic package
TO3P,TOP3,SOT199,TOP66 100Volt , 15amp power MOSFET n and p type pairings
for audio use ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

The popular N/P fets in this size in ( TO247) package are IRFP530/IRFP9530
and IRFP540/IRFP9540 in the ( TO220) package are IRF520/IRF9520 and
IRF530/IRF9530 and IRF540/IRF9540.
Ray



"N Cook" wrote in message
...
In the same manner that, often for audio power output situations,
cheap 100V, 15amp TIP3055/TIP2955 with maybe a bit of change of mounting
is
a perfectly servicable replacement for rare/expensive 2SA... / 2SC...
bipolar pairs.
Is there anything similarly for the same/similar wide plastic package
TO3P,TOP3,SOT199,TOP66 100Volt , 15amp power MOSFET n and p type
pairings
for audio use ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

Sorry,
Correction
below.
The popular N/P fets in this size in ( TO247) package are IRFP130/IRFP9130
and IRFP140/IRFP9140 in the ( TO220) package are IRF520/IRF9520 and
IRF530/IRF9530 and IRF540/IRF9540.
Ray



"N Cook" wrote in message
...
In the same manner that, often for audio power output situations,
cheap 100V, 15amp TIP3055/TIP2955 with maybe a bit of change of mounting
is
a perfectly servicable replacement for rare/expensive 2SA... / 2SC...
bipolar pairs.
Is there anything similarly for the same/similar wide plastic package
TO3P,TOP3,SOT199,TOP66 100Volt , 15amp power MOSFET n and p type
pairings
for audio use ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

Ray King wrote in message
...
Sorry,
Correction
below.
The popular N/P fets in this size in ( TO247) package are
IRFP130/IRFP9130
and IRFP140/IRFP9140 in the ( TO220) package are IRF520/IRF9520 and
IRF530/IRF9530 and IRF540/IRF9540.
Ray



"N Cook" wrote in message
...
In the same manner that, often for audio power output situations,
cheap 100V, 15amp TIP3055/TIP2955 with maybe a bit of change of
mounting
is
a perfectly servicable replacement for rare/expensive 2SA... / 2SC...
bipolar pairs.
Is there anything similarly for the same/similar wide plastic package
TO3P,TOP3,SOT199,TOP66 100Volt , 15amp power MOSFET n and p type
pairings
for audio use ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/







Thanks for the IRFP sugestion, its always the p-ch ones that put the prices
up.
I think I'll get a stock of IRFP240
and IRFP9240, 200V, 12 amp ,TO247 ones which seem to be the best bang per
buck in the UK.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

Ray King wrote in message
...
Sorry,
Correction
below.
The popular N/P fets in this size in ( TO247) package are
IRFP130/IRFP9130
and IRFP140/IRFP9140 in the ( TO220) package are IRF520/IRF9520 and
IRF530/IRF9530 and IRF540/IRF9540.
Ray



"N Cook" wrote in message
...
In the same manner that, often for audio power output situations,
cheap 100V, 15amp TIP3055/TIP2955 with maybe a bit of change of
mounting
is
a perfectly servicable replacement for rare/expensive 2SA... / 2SC...
bipolar pairs.
Is there anything similarly for the same/similar wide plastic package
TO3P,TOP3,SOT199,TOP66 100Volt , 15amp power MOSFET n and p type
pairings
for audio use ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/







In a similar vein. If an amp needs a rare or expensive or unattainable
output hybrid block STK..., TA..., Si... I tend these days using a
relatively cheap for its performance, 100W TDA7294 instead. Small enough to
place upside down or 2 together for 2 channels, with extra clamping and with
a strip of matrix board on the new block pins then insulated wires crossing
over one another to the original pad positions.
It is usually possible to work out the DC rails, i/ps,o/p, comp, mute lines
even if a pinout for the original is not available.


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

N Cook wrote:

In a similar vein. If an amp needs a rare or expensive or unattainable
output hybrid block STK..., TA..., Si... I tend these days using a
relatively cheap for its performance, 100W TDA7294 instead. Small enough to
place upside down or 2 together for 2 channels, with extra clamping and with
a strip of matrix board on the new block pins then insulated wires crossing
over one another to the original pad positions.
It is usually possible to work out the DC rails, i/ps,o/p, comp, mute lines
even if a pinout for the original is not available.

I do miss those Maplin 150 watt mosfet modules, great for resurrecting
old stuff like H-H PA amps and the like. There`s nothing quite like them
now, I must have built over a hundred, and most of them I bet are still
working.

Ron(UK)

--
Lune Valley Audio
Public Address Systems
Hire Sales Maintenance
www.lunevalleyaudio.com

Ron(UK) wrote in message
...
N Cook wrote:

In a similar vein. If an amp needs a rare or expensive or unattainable
output hybrid block STK..., TA..., Si... I tend these days using a
relatively cheap for its performance, 100W TDA7294 instead. Small enough
to
place upside down or 2 together for 2 channels, with extra clamping and
with
a strip of matrix board on the new block pins then insulated wires
crossing
over one another to the original pad positions.
It is usually possible to work out the DC rails, i/ps,o/p, comp, mute
lines
even if a pinout for the original is not available.

I do miss those Maplin 150 watt mosfet modules, great for resurrecting
old stuff like H-H PA amps and the like. There`s nothing quite like them
now, I must have built over a hundred, and most of them I bet are still
working.

Ron(UK)

--
Lune Valley Audio
Public Address Systems
Hire Sales Maintenance
www.lunevalleyaudio.com

Assuming you put in spring clamps, or such, then cutting off the protruding
tab of the TDA7294 leaves a block only 20x10x4 mm , so 2 easily go in the
space of an STK... etc and those are usually quite a bit less than 2x 100W.
I wonder if they're bridgable, I'll have to dig out the pdf.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

"Ron(UK)" wrote in message
...
N Cook wrote:

In a similar vein. If an amp needs a rare or expensive or unattainable
output hybrid block STK..., TA..., Si... I tend these days using a
relatively cheap for its performance, 100W TDA7294 instead. Small enough
to
place upside down or 2 together for 2 channels, with extra clamping and
with
a strip of matrix board on the new block pins then insulated wires
crossing
over one another to the original pad positions.
It is usually possible to work out the DC rails, i/ps,o/p, comp, mute
lines
even if a pinout for the original is not available.

I do miss those Maplin 150 watt mosfet modules, great for resurrecting old
stuff like H-H PA amps and the like. There`s nothing quite like them now,
I must have built over a hundred, and most of them I bet are still
working.

Ron(UK)


Ron

I always used to favour the ILP modules for the same purpose. Remember them
? They always used to advertise in Practically Witless magazine. For many
years, they disappeared, then I tried searching them on the 'net a few years
back, and I found a piece by the guy that was originally involved with them,
and it seemed that he was going back into production. I just put it into
Google again, and it came straight back with the top hit, so it seems that
they are in production again now. As I recall, these were very 'plug n play'
also with only + / - power, gnd, in and out connections, and were just about
bomb proof. Might be worth getting one in just to play with ... ??


http://www.ilpelectronics.com/index.asp

Arfa

Arfa Daily wrote in message
...

"Ron(UK)" wrote in message
...
N Cook wrote:

In a similar vein. If an amp needs a rare or expensive or unattainable
output hybrid block STK..., TA..., Si... I tend these days using a
relatively cheap for its performance, 100W TDA7294 instead. Small
enough
to
place upside down or 2 together for 2 channels, with extra clamping and
with
a strip of matrix board on the new block pins then insulated wires
crossing
over one another to the original pad positions.
It is usually possible to work out the DC rails, i/ps,o/p, comp, mute
lines
even if a pinout for the original is not available.

I do miss those Maplin 150 watt mosfet modules, great for resurrecting
old
stuff like H-H PA amps and the like. There`s nothing quite like them
now,
I must have built over a hundred, and most of them I bet are still
working.

Ron(UK)


Ron

I always used to favour the ILP modules for the same purpose. Remember
them
? They always used to advertise in Practically Witless magazine. For many
years, they disappeared, then I tried searching them on the 'net a few
years
back, and I found a piece by the guy that was originally involved with
them,
and it seemed that he was going back into production. I just put it into
Google again, and it came straight back with the top hit, so it seems that
they are in production again now. As I recall, these were very 'plug n
play'
also with only + / - power, gnd, in and out connections, and were just
about
bomb proof. Might be worth getting one in just to play with ... ??


http://www.ilpelectronics.com/index.asp

Arfa



I seem top remember those were dV/dt suceptable to failure (fridge-switch
syndrome) if you did not limit the i/p dv/dt


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

N Cook wrote in message
...
Ron(UK) wrote in message
...
N Cook wrote:

In a similar vein. If an amp needs a rare or expensive or unattainable
output hybrid block STK..., TA..., Si... I tend these days using a
relatively cheap for its performance, 100W TDA7294 instead. Small
enough
to
place upside down or 2 together for 2 channels, with extra clamping
and
with
a strip of matrix board on the new block pins then insulated wires
crossing
over one another to the original pad positions.
It is usually possible to work out the DC rails, i/ps,o/p, comp, mute
lines
even if a pinout for the original is not available.

I do miss those Maplin 150 watt mosfet modules, great for resurrecting
old stuff like H-H PA amps and the like. There`s nothing quite like them
now, I must have built over a hundred, and most of them I bet are still
working.

Ron(UK)

--
Lune Valley Audio
Public Address Systems
Hire Sales Maintenance
www.lunevalleyaudio.com

Assuming you put in spring clamps, or such, then cutting off the
protruding
tab of the TDA7294 leaves a block only 20x10x4 mm , so 2 easily go in the
space of an STK... etc and those are usually quite a bit less than 2x
100W.
I wonder if they're bridgable, I'll have to dig out the pdf.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



The pdf shows 2 bridged example but 8 ohm minimum but I've seen 4 of these
bridged in a high power mixer-amp so presumably 4 ohm in that case.
I meant SVi not Si, the Technics things

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

N Cook wrote:
Ron(UK) wrote in message
...
N Cook wrote:

In a similar vein. If an amp needs a rare or expensive or unattainable
output hybrid block STK..., TA..., Si... I tend these days using a
relatively cheap for its performance, 100W TDA7294 instead. Small enough
to
place upside down or 2 together for 2 channels, with extra clamping and
with
a strip of matrix board on the new block pins then insulated wires
crossing
over one another to the original pad positions.
It is usually possible to work out the DC rails, i/ps,o/p, comp, mute
lines
even if a pinout for the original is not available.
I do miss those Maplin 150 watt mosfet modules, great for resurrecting
old stuff like H-H PA amps and the like. There`s nothing quite like them
now, I must have built over a hundred, and most of them I bet are still
working.

Ron(UK)

--
Lune Valley Audio
Public Address Systems
Hire Sales Maintenance
www.lunevalleyaudio.com

Assuming you put in spring clamps, or such, then cutting off the protruding
tab of the TDA7294 leaves a block only 20x10x4 mm , so 2 easily go in the
space of an STK... etc and those are usually quite a bit less than 2x 100W.
I wonder if they're bridgable, I'll have to dig out the pdf.

Yeah, quite a lot of guitar and bass amps use a pair in bridge mode,
Carslbro BassBomber springs to mind, tho I dont have a ct diag for one
offhand.

They do need sufficient cooling btw

Ron(UK)

Arfa Daily wrote:
"Ron(UK)" wrote in message

I do miss those Maplin 150 watt mosfet modules, great for resurrecting old
stuff like H-H PA amps and the like. There`s nothing quite like them now,
I must have built over a hundred, and most of them I bet are still
working.

Ron(UK)


Ron

I always used to favour the ILP modules for the same purpose. Remember them
? They always used to advertise in Practically Witless magazine. For many
years, they disappeared, then I tried searching them on the 'net a few years
back, and I found a piece by the guy that was originally involved with them,
and it seemed that he was going back into production. I just put it into
Google again, and it came straight back with the top hit, so it seems that
they are in production again now. As I recall, these were very 'plug n play'
also with only + / - power, gnd, in and out connections, and were just about
bomb proof. Might be worth getting one in just to play with ... ??


http://www.ilpelectronics.com/index.asp

Oh cheers, I`ll take a look at those, I built a 200w power amp using
them way way back.


Ron(UK)