Studio Reference Amplifier

[apexaudio]

Originally Posted by veljko

Yes, 4R7, my mistake.

Plan is to spend some time in forward "engenering" en look what's going to happend. For a hoby it is a quite and enough efort i belive...

With more power standard PSU become impractical and more costly... Did you ever try this modul or B500 with something like this or similar? Eny prognose or segestion whit this type of PSU?
http://www.hypex.nl/docs/SMPS1200_datasheet.pdf

With SMPS PSU amps have better bass response in my expirience.

[veljko]

Originally Posted by 44250

to veljko: i am not at home and can't open pdf,by the link i'd say that it is 1k2 VA SMPS,is there a price and if there is how much does it cost?

181.5E

[AndrewT]

Originally Posted by apexaudio

5 pairs of MJW21193/4 will be OK for SR800.

that is very roughly equivalent to 25pairs of 2sa1943/c5200 when operating with supply rails around +-90Vdc.

You have still not answered the question

How did you make the amplifier reliable with 1943/5200?

[apexaudio]

Answer is in post #986 or you ask about VI limiters on SR800?

[AndrewT]

Originally Posted by apexaudio

Answer is in post #986 or you ask about VI limiters on SR800?

I was hoping that you knew a way to make post977 work, but it now appears that you posted this in error.

You should not leave post977 showing when you are now saying it needs 21193/4 to work reliably.

It is now time to remove post977 and replace with the corrected version.

[apexaudio]

Originally Posted by AndrewT

I was hoping that you knew a way to make post977 work, but it now appears that you posted this in error.

You should not leave post977 showing when you are now saying it needs 21193/4 to work reliably.

It is now time to remove post977 and replace with the corrected version.

Amp from post #977 work but this is SR400 with 2SA1943/2SC5200. I don't share SR400 and SR800 for DIY, pictures of pcb with parts notifications is just for info.
VI limiters is the way to make amp reliable with any transistors, just use 1R/5W instead 0R33/5W

[veljko]

Originally Posted by apexaudio

Amp from post #977 work but this is SR400 with 2SA1943/2SC5200. I don't share SR400 and SR800 for DIY, pictures of pcb with parts notifications is just for info.
VI limiters is the way to make amp reliable with any transistors, just use 1R/5W instead 0R33/5W

It would be nice to know is the layout from post Studio Reference Amplifier is in working condition (i meen is the layout 100% realible), without sch there is verry litle space for manuvers and for some of us allmost imposible to do some checking.
Sorry for so many questions about spesific layout but this is what you get when you do some posting like that

[apexaudio]

Originally Posted by veljko

It would be nice to know is the layout from post Studio Reference Amplifier is in working condition (i meen is the layout 100% realible), without sch there is verry litle space for manuvers and for some of us allmost imposible to do some checking.
Sorry for so many questions about spesific layout but this is what you get when you do some posting like that

But answer is also in post #977: "High power version, but not tested."
Regards

[AndrewT]

Then remove it if you have no confidence in the information./

[44250]

I don´t think that he can remove it after this long.

By the way he imediately said that it is not tested so it could be seen as possible way to do it,not the way that it should be done.

Even if he could remove it than there should most of later posts be deleted too,because they (almost) all mention SR800. That can only be done by the moderators of the forum...