Not try to infringe some property but : I am very intrigued by this McIntosh amplifier MC2KW .
Is someone on this forum that have the possibility to clone the original PCB of this amplifier ?
(I have try at the bank for an loan to buy something original from McIntosh like this but no luck , so i want to build one ...... need to say that my father is not a prince or a king to afford ... )
🙂
This should be done in a way of open project and only for diy purpose ...
So what are you say about ?
Is someone on this forum that have the possibility to clone the original PCB of this amplifier ?
(I have try at the bank for an loan to buy something original from McIntosh like this but no luck , so i want to build one ...... need to say that my father is not a prince or a king to afford ... )
🙂
This should be done in a way of open project and only for diy purpose ...
So what are you say about ?
Replicating a PCB of one of the Power Modules (the schematic of which, I take it, you posted) won't help - you would also need an Output Module, including its very special output transformer. Replicating that would be, at the least, difficult as a DIY project.
It's to complicated for me.And I don't know for what purpose one would need so much power.Surtainly not for home listening.This is a concert amp.
This topology, op-amp input stage with additional VAS to boost the voltage is prone to ostillations and very high skill is needed to make it working.I read about this in a book and the author of that book had the opinion or experience not to build amps of such topology until you have enough skill.
This topology, op-amp input stage with additional VAS to boost the voltage is prone to ostillations and very high skill is needed to make it working.I read about this in a book and the author of that book had the opinion or experience not to build amps of such topology until you have enough skill.
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I don't see the point of the output transformers in the mcintosh amps, if i was given such amp to keep or repair, those transformers would be the first thing i'd rip off of there.
Then I hope (for both you and your customer) that you will never get such job to do.
effebi
The idea of an transformer at an output of an bridged amplifier is awesome .
On the other hand also the VAS and pre-final attack are also good idea .
(I know : prone to oscillate , but what an engineered realization . )
So from here to try to realize an scaled down amplifier is only a step.
On the other hand also the VAS and pre-final attack are also good idea .
(I know : prone to oscillate , but what an engineered realization . )
So from here to try to realize an scaled down amplifier is only a step.
McIntosh Mc2KW
In the service manual, only one part of the channel is shown (+AMP), need to have another -AMP to run the system as advertised with 2 power module in bridge mode that makes it 2000w.
This is a great amplifier with .005 THD n never seen specs from any other high power stuff...'m crazy to have it in stereo to battle in phil audio contest at 4000w...
As Danzup say, "my father is not a prince or a king to afford", what more of a filipino, we are poor and have a very limited resources of parts..Where can i dig a "ThermaltraK" transistors? How to have a substitute for TR with only a Mchouse ID...and most of all, a mirrored autotransformer..
Where can I start? I have extracted the basic circuits of audio amp from manual eliminating the complicated logic circuits for fiber ops applications, logos, meter,turn on, cable check, etc..and finally made a design of PCB.
Ric
In the service manual, only one part of the channel is shown (+AMP), need to have another -AMP to run the system as advertised with 2 power module in bridge mode that makes it 2000w.
This is a great amplifier with .005 THD n never seen specs from any other high power stuff...'m crazy to have it in stereo to battle in phil audio contest at 4000w...
As Danzup say, "my father is not a prince or a king to afford", what more of a filipino, we are poor and have a very limited resources of parts..Where can i dig a "ThermaltraK" transistors? How to have a substitute for TR with only a Mchouse ID...and most of all, a mirrored autotransformer..
Where can I start? I have extracted the basic circuits of audio amp from manual eliminating the complicated logic circuits for fiber ops applications, logos, meter,turn on, cable check, etc..and finally made a design of PCB.
Ric
Have you considered Bryston power amplifiers? Their a different kind of company to the likes of McIntosh, less fancy marketing and more rugged workman-like powerhouses. Their philosophy is second to none.
DIY'ing any amp of these calibres will not be cheap, or easy.
Sorry I couldn't help
DIY'ing any amp of these calibres will not be cheap, or easy.
Sorry I couldn't help
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Heatsink PCB
Bryston is A-OK and I have also considered many brands but its nice to be going further and advanced where the circuit is unique despite of a limited sources. I have accepted many drawbacks and not being discouraged because there are people out there who still can help. Attach is part of my effort and hope somebody may have track on "thermaltrak" Transistor..image copper route may not be like the original..
Bryston is A-OK and I have also considered many brands but its nice to be going further and advanced where the circuit is unique despite of a limited sources. I have accepted many drawbacks and not being discouraged because there are people out there who still can help. Attach is part of my effort and hope somebody may have track on "thermaltrak" Transistor..image copper route may not be like the original..
Attachments
The built of Mc2KW is a Plus and Minus mono amplifier and somehow I cannot figure-out the outputterminal connections in manual because Terminal A and Terminal B of 4 Ohms Wirings are not shown..
Will Someone teach me if the attached drawing is the correct interpretation of the autotransformer layout? I believe it's a double wound transformer in one core, but I'm skeptic of my own configuration.
I have completed the designs of all PCB including Predriver, PS, Input/Output etc.with the exceptions of logic circuits and Power Guard..
Will Someone teach me if the attached drawing is the correct interpretation of the autotransformer layout? I believe it's a double wound transformer in one core, but I'm skeptic of my own configuration.
I have completed the designs of all PCB including Predriver, PS, Input/Output etc.with the exceptions of logic circuits and Power Guard..
Attachments
I agree. It's over complicated.
Have a look at the Pass designs for simplicity and audio nirvana for a DIY build.
Not so..Mac became complicated only because of its computer circuits..I have already pulled-out the audio basics.The only intricate here is the money, the House ID transistors and the puzzling is the 3 output terminal bar, but it will work anyway and tweek later...couldnt resist doing this (its one of a kind)..PCB is already on my lap and the autotransformer secret is here.
Attachments
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Thermaltrak Transistors
I wonder which of these ON SEMICONDUCTOR "thermaltrak" transistors
are used by McIntosh in this Mc2kw.
NJL0302DG 180W NPN
NJL0281DG 180w PNP
NJL3281D 200W PNP
NJL1302D 200W NPN
NJL4302DG 250W NPN
NJL4281DG 250W PNP
NJL21193DG 200W PNP
NJL21194DG 200W NPN
I wonder which of these ON SEMICONDUCTOR "thermaltrak" transistors
are used by McIntosh in this Mc2kw.
NJL0302DG 180W NPN
NJL0281DG 180w PNP
NJL3281D 200W PNP
NJL1302D 200W NPN
NJL4302DG 250W NPN
NJL4281DG 250W PNP
NJL21193DG 200W PNP
NJL21194DG 200W NPN
This link may be of interest, it is a similar amplifier .......Forumul electronistilor • Vezi subiect - Proiect comun de amplificator audio HiFi (HI-END)
'Just learned from other thread that NJL3281D 200W PNP and NJL1302D 200W NPN are used by Mac in this model.
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