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Old 12th July 2009, 06:29 AM   #1
Vivek is offline Vivek  India
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Default My dilemma

Hi all,
The choice of a DIY amp these days seems to be huge. I just keep looking at the Dx, Krill, Krell, symasym, supersym etc etc and it gets more confusing as to what I should build. I am looking to build a power amp that is not too complex and that will serve me for a few years, something in the region of 60 to 100W (8 ohm). I have a pair of Vifa TC18, D27 floorstanders.
Now, I have with me one 25-0-25 600VA EI transformer, several Elna 12000uF filter caps, eight pairs of 2SA1943/2SC5200 and several 2N3773 transistors.
I prefer to make the boards myself since importing PCBs to India is a big headache, with all the customs stuff etc.
Could somebody help me a choice please?

Thanks and regards,
Vivek
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Old 12th July 2009, 09:56 AM   #2
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Default go for a P3A

very musical amp
very nice drive ability
easy to built
pcb might be a tricky issue ( as for any amplifier)
wide bandwidth
costs nothing
and you will get loads of support
with your trafo will get arround 60-65W
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Old 12th July 2009, 10:29 AM   #3
AndrewT is offline AndrewT  Scotland
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the transformer voltage sets the limit for the power output of the attached amplifier/s.
25-0-25Vac will require a single bridge rectifier and give ~+-35Vdc as your supply voltage.
This will be OK for a 60W into 8ohm amplifier.
A 60W amplifier can run from a 60VA to 120VA transformer.
Your 600VA is a waste of resources in this context.
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Old 12th July 2009, 01:08 PM   #4
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Default Re: My dilemma

Quote:
Originally posted by Vivek
Hi all,
The choice of a DIY amp these days seems to be huge. I just keep looking at the Dx, Krill, Krell, symasym, supersym etc etc and it gets more confusing as to what I should build. I am looking to build a power amp that is not too complex and that will serve me for a few years, something in the region of 60 to 100W (8 ohm). I have a pair of Vifa TC18, D27 floorstanders.
Now, I have with me one 25-0-25 600VA EI transformer, several Elna 12000uF filter caps, eight pairs of 2SA1943/2SC5200 and several 2N3773 transistors.
I prefer to make the boards myself since importing PCBs to India is a big headache, with all the customs stuff etc.
Could somebody help me a choice please?

Thanks and regards,
Vivek

Why not use a ready built PCB, you can get them on ebay.
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Old 12th July 2009, 02:57 PM   #5
Vivek is offline Vivek  India
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Hi,
I had contemplated building the P3A amplifier but never got around to doing it. In fact, the transformer I have was ordered for the P3A. Since there are so many amplifiers around, I thought I would consider the others too.

Nigel, like I said earlier getting stuff into India from outside is a pain. That is why I was trying to avoid that.

Vivek
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Old 12th July 2009, 03:20 PM   #6
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Default The Krell will have double use..you may cook some eggs over the heatsink


The unit sounds delicious... you can take those eggs, and them some pepper, some salt, some Olive Oil..hummmmmm... delicious!

The Dx is nice.... a very nice sound... sweet loosen bass punch..to the ones loves bass.... Hit a oil barrel...Boooooom!..this is the meaning man.

The Krill is superior.... vastly better designs.... better than average...but even this way..wins the others by a nose (horse race.... win by 2 inches advantage)...but this we can feel.

I would try Roender.... or Symassym..but the original one...people have tried to destroy the good sonics but they could.

Depends the music style...want classical music?....go to Roender without doubts.

Want some Techno music.... Techno from Bora is nice.

Wanna drum and bass....no one beat Dx Amplifier..others are just loosers playing that stuff..the Dx amplifier LOL for them rolling into the floor so much funny to see they loose running alike dogs with the tail between their back legs.

Want precision...say.... some kind of studio sound... the best technology..go to Krill...but believe me..will depend the speaker..in my home difference was a nose.... depending the speaker you may have other results..of course.

Really, really, really.... amplifiers..almost them are almost the same..minor advantages into Class AB... class A use to be mufled in my point of view..also dinamics not fine.

All will depend your music.... to your Indian music.... Krill may be the one maybe..you have some bells..something into details..have voices too.

Do the one you like man!.... all them will be good...if not satisfied, then change speaker, change room or change music.

regards,

Carlos
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Old 12th July 2009, 04:02 PM   #7
Vivek is offline Vivek  India
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That is one great explanation Carlos. I mostly listen to western and Indian classical music, rock and blues. But I do like a little punch in the low end.
Right now, I have the Vifa speakers but I may get some Usher Audio drivers in the near future.
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Old 12th July 2009, 04:09 PM   #8
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With 25-0-25 v transformer you will get no more than approximately 35W at 8 ohms load.
So, if you want to stick with this trafo, you need to work two amplifiers in bridge configuration to achieve the desired 80...100W output.
2 channels 100W each thus requires building 4 amps in the first place.

So the first choice you have to make is whether to stick with this trafo or go to 40-0-40 volts.
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Old 12th July 2009, 04:24 PM   #9
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by payloadde
With 25-0-25 v transformer you will get no more than approximately 35W at 8 ohms load....................
.................... the first choice you have to make is whether to stick with this trafo or go to 40-0-40 volts.
Hi,
your calculator needs new batteries.
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Old 12th July 2009, 05:43 PM   #10
Vivek is offline Vivek  India
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The Krill certainly looks like an interesting amplifier to try out. Maybe i could do a trial run with the transformer I have on hand and see how it goes. Obviously I will be building my own boards. Which layout should I use? There seem to be two in the Krill construction thread.
Vivek
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