When implemented right, they sounded great. Superb slam and bass authority. I heard a commercial amp using these.
Elektor modified their 60watt Hexfet Amp to use this special Audio IGBT pair from Toshiba. They also published another current feedback amp with the same complementary IGBT pair.
I have one unused pair. Would like to get another pair and try out something. They were very expensive back then. Now it's both the price and genuineness.
Just a thought. Would it not be possible to substitute these Toshiba devices with compound-discreet IGBTs published on this forum by LazyCat, IIRC. They were made of one Mosfet and two BJTs.
Elektor modified their 60watt Hexfet Amp to use this special Audio IGBT pair from Toshiba. They also published another current feedback amp with the same complementary IGBT pair.
I have one unused pair. Would like to get another pair and try out something. They were very expensive back then. Now it's both the price and genuineness.
Just a thought. Would it not be possible to substitute these Toshiba devices with compound-discreet IGBTs published on this forum by LazyCat, IIRC. They were made of one Mosfet and two BJTs.
Thanks a lot for the expert advice guys!
I might give it a shot with the MOSFETs...
But before I try that just another wee question:
I think that those Toshiba IGBTs were used on the Palmer LX 2000 PA Power Amp.
Do you by any chance know anyone that might have any spares from an old Palmer amp?
Cheers
I might give it a shot with the MOSFETs...
But before I try that just another wee question:
I think that those Toshiba IGBTs were used on the Palmer LX 2000 PA Power Amp.
Do you by any chance know anyone that might have any spares from an old Palmer amp?
Cheers
Very unlikely.
And like i said before, the IGBT suffers from ageing failure.
You are dealing with old devices, storage and handling also matter.
Better go for suitable Mosfets and try to use only single pairs, less issues with matching. Chip amps, bipolar transistors are also options.
Just check the voltage to the power stage and decide.
And like i said before, the IGBT suffers from ageing failure.
You are dealing with old devices, storage and handling also matter.
Better go for suitable Mosfets and try to use only single pairs, less issues with matching. Chip amps, bipolar transistors are also options.
Just check the voltage to the power stage and decide.
Original spares are still available here and there.
"Storage" is no matter in this respect - and why
should one exchange an amp with twelve output
devices per channel by one with only two ? Is this
good "expert advice" ?
OP did not care to explain what was the "problem
with the TOSHIBA IGBTs" and why he is looking
for p-channel devices only.
"Storage" is no matter in this respect - and why
should one exchange an amp with twelve output
devices per channel by one with only two ? Is this
good "expert advice" ?
OP did not care to explain what was the "problem
with the TOSHIBA IGBTs" and why he is looking
for p-channel devices only.
He has so far got no response for parts except dubious eBay sellers.
It might be in a forgotten area of somebody's storage.
Temperature, humidity, ESD protection, they all count in storage conditions.
Getting 6 sets of matched pairs...
For one that is difficult.
Second, it is easier to build with one pair, I think.
Power wise, I do not think he will be using it flat out.
Also, if it is the same as Mosfets, he needs N and P channel devices in pairs I think.
And yes, no explanation as to why he wants the P channel only, or what made him decide the units were faulty. No explanation of procedure followed, or if he has a schematic, and we do not know his level of competence in this matter.
If they all blew, they will blow again if the fault is not identified.
Then he has a problem again, finding yet more supplies.
It might be in a forgotten area of somebody's storage.
Temperature, humidity, ESD protection, they all count in storage conditions.
Getting 6 sets of matched pairs...
For one that is difficult.
Second, it is easier to build with one pair, I think.
Power wise, I do not think he will be using it flat out.
Also, if it is the same as Mosfets, he needs N and P channel devices in pairs I think.
And yes, no explanation as to why he wants the P channel only, or what made him decide the units were faulty. No explanation of procedure followed, or if he has a schematic, and we do not know his level of competence in this matter.
If they all blew, they will blow again if the fault is not identified.
Then he has a problem again, finding yet more supplies.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwiatKHKwPvyAhVGaCsKHUyyCp0QFnoECCcQAQ&url=https%3A%2F%2Fwww.indiamart.com%2Fsharadelectronics%2Fprofessional-power-amplifier-igbt.html&usg=AOvVaw1UTKI_0izwJfUiTF0P1xTT
Somebody in a smallish city in India still makes them.
Caveat Emptor.
Somebody in a smallish city in India still makes them.
Caveat Emptor.
160W IGBT Amplifier Circuit - Electronics Projects Circuits
GT20D101 - n channel
GT20D201 - p channel
88W/8 R with one pair
Not clear if total of both channels, or one channel only, did not read full article.
6 x 88 = 528 Watts. That is too much for most homes.
GT20D101 - n channel
GT20D201 - p channel
88W/8 R with one pair
Not clear if total of both channels, or one channel only, did not read full article.
6 x 88 = 528 Watts. That is too much for most homes.
Mystery solving....
A dull day at work...
And sometimes OPs don't appreciate it.
Still no response as to why only one side of the pair is doubtful.
Leave it till he or she comes forward.
We had a female looking for Rhodium plated jacks.
Another wanted to build a chip amp, and Bose speakers to listen to.
Enjoy the oddballs...
A dull day at work...
And sometimes OPs don't appreciate it.
Still no response as to why only one side of the pair is doubtful.
Leave it till he or she comes forward.
We had a female looking for Rhodium plated jacks.
Another wanted to build a chip amp, and Bose speakers to listen to.
Enjoy the oddballs...
What? The links? Useful I think.
Those were for a company who makes audio amps with IGBT, and another was for an amp using one pair.
The idea was to help the OP understand, and decide.
Not posted yet, the OP.
Those were for a company who makes audio amps with IGBT, and another was for an amp using one pair.
The idea was to help the OP understand, and decide.
Not posted yet, the OP.
Original question was "Can anyone help me find .. ".
Please start a dedicated thread "A dull day at work".
Please start a dedicated thread "A dull day at work".
I think English is not your first language.
The OP is trying to find some odd obsolete parts.
Somebody makes similar amps, so that amp maker is more able to answer his queries rather than us.
If I take the trouble to guide some stranger to that amp maker, how does it affect you so much?
Am I going off topic in helping somebody solve a problem?
The OP is trying to find some odd obsolete parts.
Somebody makes similar amps, so that amp maker is more able to answer his queries rather than us.
If I take the trouble to guide some stranger to that amp maker, how does it affect you so much?
Am I going off topic in helping somebody solve a problem?
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I think English is not my and your your first language.
So if you ("we") are not able to answer the original question,
a new thread may be the right place to discuss dull work days
and strange IGBT applications.
Remember you even told us "it is an odd use" - I think this is
clearly off topic.
So if you ("we") are not able to answer the original question,
a new thread may be the right place to discuss dull work days
and strange IGBT applications.
Remember you even told us "it is an odd use" - I think this is
clearly off topic.
Thread Title:
Looking for TOSHIBA GT20D201 IGBTs
Which are used in this case in an amplifier.
He, the OP, is not able to get those from reliable sources.
So I tell him to talk to somebody who makes them, and to an article about this same transistor in use in an audio amplifier.
Please read up on IGBT on Wikipedia.
IGBT audio amps were made only for a few years and went out of use in production by 2009 or so, mostly.
Looking for TOSHIBA GT20D201 IGBTs
Which are used in this case in an amplifier.
He, the OP, is not able to get those from reliable sources.
So I tell him to talk to somebody who makes them, and to an article about this same transistor in use in an audio amplifier.
Please read up on IGBT on Wikipedia.
IGBT audio amps were made only for a few years and went out of use in production by 2009 or so, mostly.
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Don't know how it became bold type...
The main use of IGBT is in monotonic service, as in welding machines and drives, where it handles a single frequency.
Music is polyphonic, and IGBT are used where Mosfets have problems, as in high power situations.
And as other posters have pointed out, not me, these are not normally used for audio.
Toshiba made some devices for this market, they are now obsolete.
The OP needs the amp repaired. So trying another source, as in Palmer amp spares...which he is trying, on other forums as well, with little success.
See post No. 2 in this thread, Rayma says that audio is a minor application for this device type (more or less his meaning).
And I asked you in an earlier post: You are saying no guesses, so please share your knowledge about this topic and application.
So I repeat this query, tell us if you know about it.
The main use of IGBT is in monotonic service, as in welding machines and drives, where it handles a single frequency.
Music is polyphonic, and IGBT are used where Mosfets have problems, as in high power situations.
And as other posters have pointed out, not me, these are not normally used for audio.
Toshiba made some devices for this market, they are now obsolete.
The OP needs the amp repaired. So trying another source, as in Palmer amp spares...which he is trying, on other forums as well, with little success.
See post No. 2 in this thread, Rayma says that audio is a minor application for this device type (more or less his meaning).
And I asked you in an earlier post: You are saying no guesses, so please share your knowledge about this topic and application.
So I repeat this query, tell us if you know about it.
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