output devices on X -X.5 and XA.5

[Melon Head]

You could possibly hook them up to a high powered F4/BA2 or BA1 output stage

 

[Stefanoo]

You could possibly hook them up to a high powered F4/BA2 or BA1 output stage, or maybe you could do a cascoded version

every idea would be welcomed and carefully evaluated and listened.
Wouldn't cascoded version be too complex at higher power due to the higher number of FETs that have to be matched up?
Does it sound that much better?
My rule of thum is to cascade the front end stage, which yealds to a more transparent detailed sound and technically to a lower distortion and a little better sqare wave response i.e. greater BW

 

[Melon Head]

I deleted that, because I noticed you want 250W

 

[Stefanoo]

I deleted that, because I noticed you want 250W

yeah makes sense.

 

[Melon Head]

Honestly I would start doing measurements. You may not need 250W
Work out your maximum peak voltage requirement when listening to music at loud-enjoyable levels

 

[Stefanoo]

well the thing is also that I am re-using the HW from the X250 which means that Rails voltage are already determined and so is the peak output voltage

 

[Melon Head]

Understood
It might be possible to change out the transformer for lower voltage and then increase bias
You probably don't want to do that

I have to go to bed now it is 4:30 am

Hang on. Are you intending on stripping the amp and reusing the parts into a different design, using the same chassis, transformer power supply

 

[Stefanoo]

oh gosh go to bed it is too late for you...although you can sleep in tomorrow I am assuming since it is saturday..

Yes my intent is to strip the matched mosfets, transformer, filter caps heatsink and chassis and then plug in different input and output boards.
I would also like to keep the same number of output FETs to match all the holes on the heatsink ...I think it would make a huuuppyy 24 Device per channel

 

[Melon Head]

I think I would keep the output bank of mosfets. and modify the front end with maybe something like BA3
I can't remember if it is push-pull or SE output stage on your amp

 

[Stefanoo]

I think I would keep the output bank of mosfets. and modify the front end with maybe something like BA3
I can't remember if it is push-pull or SE output stage

could you point me out to the BA3? I don't know what you are referring too.
Thanks for your inputs

 

[Melon Head]

I am going to bed

 

[Zen Mod]

Xs 150 - Passlabs

 

[Melon Head]

could you point me out to the BA3? I don't know what you are referring too.
Thanks for your inputs

It is a front end without feedback. Very nice design
Burning Amplifier 3

 

[buzzforb]

https://passlabs.com/products/amplifiers
Same thing in the F-whatever.
Why would you buy a however many $K amp and strip it for parts. Forgive me, as I do not know you, but thats moronic. Shows you don't know SiT!

 

[Melon Head]

You could sell your amp and start from scratch.
You could build something very nice for about $1000
Having said that building the chassis is a pain in the ars5, so it may not be an overly dumb idea. No offense. Dumb is as just as good as fugly
You will soon discover we are a very weird group of people

 

[Stefanoo]

isn't this what you are referring too?

http://www.diyaudio.com/forums/diyaudio-com-articles/194809-burning-amplifier-ba-3-a.html

However this is SE output coupled and I would rather go for pushpull with SE biasi DC coupled....maybe I am wrong...

Have a good night and talk later!

 

[buzzforb]

$1000. Are you carzy. You cant build something nice for a thousand. Computer monitor amp, maybe. And I do mean maybe.

 

[Stefanoo]

You could sell your amp and start from scratch.
You could build something very nice for about $1000

There is no way I could be something nice for that much....With the X250 I not only get a custom plitron, but nice powerful heatsink a full set of matched mosfets and a beautiful finished chassis.
If I can't build anything better than X250 then I just keep the X250 and upgrade next year.
My purpose here is to build something better and that looks nice as well and I thought that this although p[retty expensive could have been a viable solution.

 

[Stefanoo]

$1000. Are you carzy. You cant build something nice for a thousand. Computer monitor amp, maybe. And I do mean maybe.

you anticipated me

Consider it is 4.30AM there...at that hour I am already lucky if I can spell my name right

 

[Stefanoo]

Xs 150 - Passlabs

oh sogh I know that Zen....do you want to give a me a little heavy Christmass present now?
maybe a nice Xs150?