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The Black Amp


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#16 jasonhanjk

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Posted 27 September 2004 - 09:58 PM

He He. Nice job.
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#17 [email protected]

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Posted 27 September 2004 - 11:03 PM

QUOTE (bpribadi @ Sep 27 2004, 09:38 PM)
...

QUOTE
The other important question is how much will you charge to have one built?


All are estimated price in S$:
110 for 2x OPA637 & 3x BUF634
40 for Hammond box
20 for the blue ALPS
10 for the Neutrik socket (haven't include the S$2.5 fake neutrik that I bought to mod the spring)

With other stuff like the resistors, Panasonic FCs, connectors, mini sockets, switch, cable, etc. It cost around S$250.- parts only. But it matches amps with price 3x or more it's price wink.gif So still worth tongue.gif

Wow, looking forward to hear more impressions then.
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#18 kenshinz

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Posted 27 September 2004 - 11:54 PM

Great job (really love your soldering and layout), and nice pics too biggrin.gif
Headphones!
Three weeks from now You will be fully burned in.
Imagine how You'll sound, and it will be so.
Hold the line!
Stay with me!
If you find yourself alone,
sounding distorted with with excessive bass and treble,
do not be troubled --
for you are in Elysium,
and you're already dead!
Brothers, what You sound like in Life echoes in Eternity....


#19 digi01

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Posted 28 September 2004 - 09:14 AM

QUOTE (bpribadi @ Sep 27 2004, 10:34 AM)

Did you guys had any problem with the pictures? I heard photobucket has network problem

recently,my office fiber net is very unsteadiness.I can see all pic,but a little slow.

congratulations again,good work.bram laugh.gif



diy

#20 Mackie

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Posted 28 September 2004 - 01:30 PM

I can't view the pictures yesterday but today...........blind me..............it's gorgeous! Very well done! How does it sound to ya?
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#21 bpribadi

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Posted 28 September 2004 - 02:45 PM

QUOTE
How does it sound to ya?


Thanks Mackie!

I was very busy last week, so I finished the amp last minute. My brother came to Singapore last Saturday, and went back on Sunday. I finished the amp Saturday midnight (already Sunday morning actually), so didn't have enough time to test it. Sunday morning, the amp had been burnt-in for about 7 hours. So I only listen to it for a few song tracks from the Chesky Demo Disc.

My impression:
Very very very natural sound. Almost no coloration at all. I love it. Good bass, thick midrange, and correct level of treble when paired with Grado RS-1. Imaging is excellent. I agree if people said that OPA637 (and 627) is one of the best audio Op-Amp. That is very true! It sounds very musical!

Compared to the AD8066 in MyPimeta, not much different, the free AD8066 is really comparable with the SGD 75.- OPA637 (2 chips). The AD8066 sounds a tad brighter, and slightly sounds more 'airy', means you can feel more space between the singers and musical instruments. So the OPA637 is more natural, but the AD8066 has a unique signature which makes it sounds 'high-end'. I mean, the AD8066 signature sound is a very welcome sounds characteristic. With my little experience with Senns, I think Senns better be paired with AD8066 than OPA637. While Grado is better paired with the OPA637.

Last night my brother connect it with Sony CDP-XA7, one of the old high-end player from Sony. And he also use Grado RS-1 (we are the Grado team grado.gif ), here is his comment:
Excellent Amp! Sounds very good! It makes the CDP-XA7 sounds thicker and more enjoyable. The amp also makes the imaging very impressive.

I hope he said that not just to make me happy tongue.gif

When I got time I will share the board layout, so all of you can save your time if you want to make one.

Edited by bpribadi, 28 September 2004 - 02:50 PM.


#22 Ny0ng1

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Posted 30 September 2004 - 12:17 AM

eeeeeee..... $250 so ex ohmy.gif..... i wish i could afford that.

but, it looks very nice and neat and classy from my POV (read: a n00b) biggrin.gif

bram, can help me build a simple (max $100) amp for me? laugh.gif

OT: now its confirmed ur an indonesian as well, have been noticing ur nick and it sounds very indonesian tongue.gif

#23 bpribadi

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Posted 30 September 2004 - 12:26 AM

QUOTE
can help me build a simple (max $100) amp for me?


I can help you in circuit diagram and components selection... but building amp need time which is luxurious to me... (I don't have the time lah... tongue.gif )

And you need to specify your taste and requirement happy.gif

#24 Q00

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Posted 30 September 2004 - 03:34 AM

QUOTE
And you need to specify your taste and requirement


Yep..building an amp for another person is not an easy task because u need to tailor the amp for that person's taste and cans and budget constraints.
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#25 bpribadi

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Posted 30 September 2004 - 02:25 PM

As promised, the board layout for those who interested.

user posted image

For schematic, refer to PPA 1.0 schematic.

#26 aaa

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Posted 02 October 2004 - 12:21 AM

may I know where you get your blue ALPS for 20?
getting one for my PPA clone.

#27 aaa

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Posted 02 October 2004 - 01:28 AM

Can also let me know where you get the female RCA and female 1/8"?
They look pretty good quality!

#28 bpribadi

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Posted 03 October 2004 - 08:50 AM

Blue ALPS : Well Audio Burlington Square
RCA socket : LHS SLT 2nd floor
1/8" socket : Kaichin SLT 3rd floor

headphone.gif

#29 aaa

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Posted 04 October 2004 - 01:37 AM

Thanks a lot bpribadi!
Your informations are really useful to my PPA project.


#30 heady

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Posted 04 October 2004 - 11:06 AM

Anyone has opinion as to whether the Alps Blue is better than those ALPS pots we bought from Farnell?
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