best 60-70W DIY AMP ????????

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phoenix87

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Joined 2010
#1
hi every body ........ i am in bit of a confusion bout which amp to make.........
here is the list
1.NMOS 200 by quasi
2. dx blames
3.synsym by mikeb
4.my simple quasi amp by sekhar
5.100W hi fidelity amp by apex
& loads more

which one to choose on the basis of sonic clarity & stability .......
i already have the psu unit,the transformer 26-0-26@8A,cabinet,and protection circuits..... kindly help me to choose



regards
aniket
 
#4
phoenix87 said:
hi every body ........ i am in bit of a confusion bout which amp to make.........
here is the list
1.NMOS 200 by quasi
2. dx blames
3.synsym by mikeb
4.my simple quasi amp by sekhar
5.100W hi fidelity amp by apex
& loads more

which one to choose on the basis of sonic clarity & stability .......
i already have the psu unit,the transformer 26-0-26@8A,cabinet,and protection circuits..... kindly help me to choose



regards
aniket
Click to expand...


quasi one & only!

regards zeoN_Rider
 
#8
Check to see what transistors you can get in your country first. Make sure they are originals and not fakes. The NMOS 200 might work best for you, as the parts are easy to get and the MOSFETs required should be readily available as they are also often used in switchmode supplies.
 
#10
jaycee said:
Check to see what transistors you can get in your country first. Make sure they are originals and not fakes.
Click to expand...

Also, I believe that Symasym be the best choice. I haven't built mine, but I intend to do so as soon as I get more good parts, coming from US.
For now, I would vote for DX BLAME ST, which has a very detailed and easy to follow project and advices, here: Greg's Web Site
and two threads in this forum, although these are not easy to follow and/or understand. Only go there if you are skilled. But Greg's site support is all you need to build the amp.
Your transformer is perfect for a two-channel version of this amp, which sounds great and is plain stable, with easily found parts.
Peace,
Max.
 
#14
hi phoenix87,

Here is a clearer picture of the schematic shown in the above mentioned thread. Please note this is not identical to the AKSA 55 kit that Hugh was selling, close, just a couple of ehancements and some fine tuning of component values missing. 😉

Also, I drew the schematic using BD139/BD140's for VAS and drivers. It would be better to use the recommended drivers and a better VAS. :magnify:

regards
 

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#19
Wahab,

Have you built and checked it? I think this is a pretty extreme comment, one you may not be qualified to make, particularly if you have not spoken to Michael Bittner, the designer, who might be pleased to engage with you on the 'poor design features' you identify.

You should play fair, Wahab, this is not like you....

Hugh
 
#20
wahab said:
This amp is not a stable one.
Despite all the hype that was made about it in this
forum, there s some poor design features on it.
Its compensation scheme is innacurate , to say the least.
Click to expand...

Wahab whats the problem with this design, you know that it was measuered and tested by pavel who is very competent to do so?? Im sure if there was problems he would of said so.
 
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