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Old 7th August 2008, 11:19 AM   #1
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Default Need help to build "Krell KSA-50"

hi,

i want to test this class A amp.

i need some help to making this push pull amp. circuit diagram is attached.

i have some transistors so i just want to use them. as i can see it is 50wrms.

i also want to know there are two type of voltages. what is that voltage?

There are few transistors used. those i don't have, may be i can use other part number insted of originally used.

*pls indicate with Q number and the transistors can be use.

i have this transistors:

MJE15030, MJE15031, BD139, BD140, 2sc4793,2SA1837, 2SC5200, 2SA1943, 2N5551, 2N5401

thank you for your help.
michael
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File Type: pdf krell ksa-50 -2.pdf (25.1 KB, 93 views)
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Old 7th August 2008, 11:40 AM   #2
AndrewT is online now AndrewT  Scotland
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go and read the KSA50 threads.
All the information is there.
Or look at the Wiki. The important bits are in there as well.
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Old 7th August 2008, 11:46 AM   #3
acid_k2 is offline acid_k2  Italy
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hi space2000

there is a ton of information in diyAudio about the Krell KSA 50, please use the "search" button.....

IMMO the transistors you have are not good for that amp, you MUST use those in the schematic. Building that amp is not simple, you need BIG heatsink, big power supply with big capacitors, big power transistors.... It's difficult to imagine that amp with T0220 devices...

edit: Andrew T, you have beat me in the same answer, i think I am too slow to write in something similar to the english language...
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Old 7th August 2008, 11:49 AM   #4
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Default hello !!!! its me again !!!!

i will suggest that your next project should be to spend some money and get the simplest used scope that you might find used anywhere for the lowest prize .....

then the next thing will be to construct the most cheap simple and working signal genarator .....

with this stuff you will find out what is going wrong with the amps you allready constructed and also you will be able to evaluate and investegate what exactly your weird designs effect sound create ocilation and so on .....

its not only to construct something that that simply "sounds" with that investment you ve made in componets should sound very RIGHT !!!!!....

hell i have 5 scopes i would gladly ship you one to play with ...and when ever you are done you ship it back to me .....

friendly regards
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Old 7th August 2008, 11:57 AM   #5
AndrewT is online now AndrewT  Scotland
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Default Re: hello !!!! its me again !!!!

Quote:
Originally posted by acid_k2

there is a ton of information in diyAudio about the Krell KSA 50, please use the "search" button.....
write in something similar to the english language...

Quote:
Originally posted by sakis
i will suggest that your next project should be to spend some money and get the simplest used scope ......

then the next thing will be to construct the most cheap simple and working signal generator .....
is Space as lazy as he gives in this impression?
He continually and repeatedly asks us to feed him with information that is already available.
When do we call a halt?
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Old 7th August 2008, 12:18 PM   #6
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Default andrew ....

i dont belive that space 2000 is lazy ..... ia actually think that he is a nice guy the only thing that he stops his work as long as sound comes out of his projects ......

meaning : that a scope will show him the mistakes he made so he will be busy trying to correct and redesign the amps he already made .... and then forum will be very quiet from everynow and then threads

of course this is not an easy task .....actually its much more hard to do than constructing a krell 50 in a round version of course with 25 sets of outs as space 2000 amplifiers normally look
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Old 7th August 2008, 12:20 PM   #7
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Default hei space .....

no hard feelings ..... i try to see this mostly as funny .....you may procceed as you like ...this is just my funny opinion

friendly spacy regards
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Old 7th August 2008, 12:41 PM   #8
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Hi,

i don't mind at all, you all are nice ppls. when i made amp, i just listen the sound quality and do it until i find the sound is quite nice and clear to my ear, its may not be 100% perfect but sound is nice to me as i am just a hobbyest. i don't stop to making just once i finished one amp. it dsn't cost me much. parts are dmn cheap. i made few and compare those which is nice to listen.

Ear.man..Ear...listen....ha...ha.....like violin..

I read about kl-50 its nice. i know its won't be easy to make. i hvn't decide yet to make...but need to know more about it. i read about it but i want to know about the transistors that i can use from my bkyd.

if i can't make then nvr mind.....no regret at all.
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Old 7th August 2008, 12:45 PM   #9
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Quote:
Originally posted by space2000
Hi,

i don't mind at all, you all are nice ppls. when i made amp, i just listen the sound quality and do it until i find the sound is quite nice and clear to my ear, its may not be 100% perfect but sound is nice to me as i am just a hobbyest. i don't stop to making just once i finished one amp. it dsn't cost me much. parts are dmn cheap. i made few and compare those which is nice to listen.

Ear.man..Ear...listen....ha...ha.....like violin..

I read about kl-50 its nice. i know its won't be easy to make. i hvn't decide yet to make...but need to know more about it. i read about it but i want to know about the transistors that i can use from my bkyd.

if i can't make then nvr mind.....no regret at all.

I read about kl-50 its nice. i know its won't be easy to make. i hvn't decide yet to make...but need to know more about it. i read about it but i want to know about the transistors that i can use from my bkyd.


space ...... you dont need to know about krell ...... you need to know about amplifiers .....start with one ...... any of your choise ......learn ....make perfect ....or as perfect is possible ....and then go ahead to the next project ......

knowledge doesnt come by producing many ....knowledge come by learning how one is working ....any one
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Old 7th August 2008, 12:53 PM   #10
AndrewT is online now AndrewT  Scotland
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Quote:
Originally posted by sakis
knowledge doesnt come by producing many ....knowledge come by learning how one is working ....
too true.
Build something really simple and measure it, compare it, test it, understand WHY it does it's thing. Then, you have learned.
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