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Old 9th October 2004, 03:38 AM   #1
digi01 is offline digi01  China
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Smile Pocket pre-amp & headamp

The circuit is common RA-1,there is not a novel one. The part of the power supply is using the JRC4556 rail splitter.and white LED.the red cap is WIMA MKP10,4.7uf BP.Gain setting at 6.
Circuit part place in under the socket.
It can drive er4s and grado headphone.the sound is graceful,a little darkness evil.at the same time,I use the module for my 3886IGC,wow!!the system sound is never so good
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Old 9th October 2004, 03:39 AM   #2
digi01 is offline digi01  China
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Old 9th October 2004, 07:10 AM   #3
amisdad is offline amisdad  United States
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Digi,

I have built many variations of RA-1 type circuits. I love the sound of the 4556! I was just thinking about using a simmilar NJR4556 with a regulated supply as a preamp for my GC which is 85% done. From your post, I take it that this is a good solution. I still have one PCB from jiggler that I can use. I have about 100 NJR4556's sitting in my parts box. This is a commonly overlooked op-amp. I still think it's my favorite. People dont like the specs, but it sure does sound great. It's a little slow, but I think that adds a tube-like character. I think you should use those regulator boards of yours on your RA-1style pre amp and let me know what happens.


Side Note,
I ordered an enclosure from par-metal. Does anybody know how long it usually takes for them to arrive? It's my last piece to the GC puzzle.
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Old 9th October 2004, 08:47 AM   #4
maxw is offline maxw  United Kingdom
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whered you get that case digi?
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Old 9th October 2004, 09:03 AM   #5
digi01 is offline digi01  China
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thank you amisdad,
I agree with you.4556 is a fine opamp.Can be used for adjusting the system sound . I think high-quality op might not have good result right away.

for maxw,
The case is made in Beijing.We call that "臏倰第".It has pcb track, is very suitable for diy stuff.

digi
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Old 9th October 2004, 09:10 AM   #6
maxw is offline maxw  United Kingdom
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Quote:
Originally posted by digi01
We call that "臏倰第"
LOL cool, I'll ask for a 臏倰第 next time im on the phone to RS
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Old 9th October 2004, 10:58 AM   #7
Franz G is offline Franz G  Switzerland
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Quote:
臏倰第
You may have a look at conrad.com, article-number 522945-22

Is this not the 臏倰第 box?

Franz
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Old 9th October 2004, 02:05 PM   #8
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NJR4556 a good sounding op-amp?

"Smooth" , dark, dead sound, with no dynamics, no detail.
If that's what you like, go ahead.
If this works fine in your system, something is very wrong there.
Don't take me wrong, but this is the cruel truth.
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Old 9th October 2004, 04:21 PM   #9
amisdad is offline amisdad  United States
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Carlos,

I have heard it sound that way as well if you implement it wrorg. If you use right value, the 4556 kicks butt. It is still dark and a little slow but lacks no detail. I prefer this sound to the digital harshness of any OPA. Those to me are too fatiguing (Actually it's quite painful). I like to listen to music, and I would rather be able to feel comfortable when doing so.
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Old 9th October 2004, 10:09 PM   #10
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Quote:
Originally posted by amisdad
It is still dark and a little slow but lacks no detail.
Dark and slow, yes, but doesn't lack detail?
Is it possible?

Quote:
Originally posted by amisdad
I prefer this sound to the digital harshness of any OPA. Those to me are too fatiguing (Actually it's quite painful).
Actually, that's what I meand.
That harshness comes from your source and/or the recordings.
You are fooling yourself by putting a blanket to stop the harshness.
Some people downgrade a component just to stop the harshness of bad recordings and/or bad sources.
That's a completely wrong approach.
You should attack the source of the problem.
That's why I always say: the source is the most important component of a system.
Trash-in-trash-out.
I think I'm giving you good advice, please don't take me wrong.

Quote:
Originally posted by amisdad
I like to listen to music, and I would rather be able to feel comfortable when doing so.
Me too, and most OPAs sound very "analogue", no harsh at all, and with much more detail than any 4556 could ever dream of.
If you are trying to soften Miles Davis' trumpet you are loosing the music's realism.
IMHO.
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