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[Country]

Country	belarus
Note	mcu r&d, microchip xc8 and xc16

The problem is that it may be difficult to source some components. I looked at the 2001 and even here it hard to get most of the transistors what. Like 2SK537, 2SK1530, 2SJ201
From what I have found.
2SK1530/2SJ201 ->IRFP240PBF/IRFP240PBF
also
2SK537 -> 2SK1643/2SK1338/2SK2733 But non of these SKUs is available from mouser(or similar)

You're right, I bought them from a well-known and reliable distributor of electronic components.
Only now have I realized that more than 10 years have passed   .

"Fugit irreparabile tempus"

Ciao
Enzo

insted of the output mosfet,  2SK537 ,
2SK1530 ,i used BUZ901,BUZ906 without any issues

In 1984 I built and used for many years the famous "Crescendo" amplifier published by Elektor in 1982.
Some of my friends still use it with great satisfaction.
Excellent sound, great dynamics, easily available components are just some of the advantages of this workhorse of homemade HiFi.
Recently (2001) Elektor published the "Crescendo Millenium Edition".
I recommend you start with this project.

https://www.elektormagazine.com/magazine/elektor-198212/44973

https://www.elektormagazine.com/magazine/elektor-200104/16985


Ciao
Enzo

The problem is that it may be difficult to source some components. I looked at the 2001 version and even here it hard to get most of the transistors. Like 2SK537, 2SK1530, 2SJ201
From what I have found.
2SK1530/2SJ201 ->IRFP240PBF/IRFP9240PBF
also
2SK537 -> 2SK1643/2SK1338/2SK2733 But non of these SKUs is available from mouser(or similar)

You said you could spend $500 so I think it can be done for that, no need to buy from grey markets / e-pray

There are gobs of reference amplifiers (schematics) on the web, grab one, update it with your part choices, simulate it, then build it.

just for fun i looked for the power transistor for the onkyo 2sc3281 and 2sa1302
i was looking to see prices for those and on alibaba 10 pairs for 60$ sounds a bit too low
and looking at the pictures i could seen they been sandblasted as the little dimples are also blasted as well

on ebay i saw some where they were dirty and not clean so there is something fishy going on

so no asia bying for me

From my experience, most of the older or expensive power transistors from these budget sites are fake remarked parts.

i have two chassis i can use on the biggish side
i also have a big heatsink i could cut in 2 pieces
i will use a/b type amplifier
not yet sure about power supply

the onkyo Onkyo TX-SV 727 R i have got bad i will see if i can fix it and recap it, its the first time i got issues with it
it has not been fixed/repaierd before, if not i will build something

i very rarely went above 50% on the volume

just for fun i looked for the power transistor for the onkyo 2sc3281 and 2sa1302
i was looking to see prices for those and on alibaba 10 pairs for 60$ sounds a bit too low
and looking at the pictures i could seen they been sandblasted as the little dimples are also blasted as well

on ebay i saw some where they were dirty and not clean so there is something fishy going on

so no asia bying for me

How will you attack this. Like will you go class D or a more traditional way class A/B. Linear or Switch Mode PSU? Another interesting topic may be the housing. As a power amplifiers are built around the heatsinks. Perhaps it could be an idea to source a non working 100W (ish) power amplifier locally. And use that as a base. Most likely the output stage will be blown. But the transformer will probably be OK(the transformer will be condiserable part of the total cost). It is just an idea and I do not know how viable this is for you. 

[Country]

Country	DE
Note	Expert in PIC programming, linux hacking, pentesting and web programming. Work in engineering Would like to join the discussion forums!

so what happened - zero posting is not an option.

i do not want anything without schematics

nothing with any mcu/firmware/displays

something that has a calculated lifespan built in

no obscure components that cant buy

no markings made by the manufacturers on components