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Old 12th July 2007, 11:31 AM   #1
Pocoyo is offline Pocoyo  Indonesia
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Default Diy Solid State Preamp

i always look all the best amplifier

From Aleph, AKSA, Audiosector, Aussie, BPA300,
Bora, DX, JLH, Krell, Leach, Symasym, To Quasy.
ECT

Theres a lot best solidstate amplifier for DIY
But i just saw bride of son of zen (Aleph 1.7)

But where the DIY Active Preamp ?
Is anybody can build this Preamp ?
Is difficult to make hi end Preamp ?
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Old 12th July 2007, 11:53 AM   #2
AndrewT is offline AndrewT  Scotland
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The difficulty is getting everyone to agree.
gain or no gain.
active or passive.
chip or discrete.
balanced or unbalanced.
switched, wiped, solid state or led volume control.
switched, solid state, relay or reed source selection.
RCA, BNC, XLR or DIN connectors.
tone control or not.
channel balance, mono switch, stereo or multichannel.

Start computing the permutations and there is a different combination for every member of the Forum.
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Old 12th July 2007, 10:30 PM   #3
Gordy is offline Gordy  United Kingdom
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Hi jeffry,

I think Andrew is right. To design and build is not so difficult, but everyone has different requirements.
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Old 12th July 2007, 11:00 PM   #4
Hartono is offline Hartono  Indonesia
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gain or no gain.
active or passive.
chip or discrete.
balanced or unbalanced.
switched, wiped, solid state or led volume control.
switched, solid state, relay or reed source selection.
RCA, BNC, XLR or DIN connectors.
tone control or not.
channel balance, mono switch, stereo or multichannel.

to add to the list:
voltage feedback, current feedback
no global feedback, global feedback
low impedance pot, high impedance pots
jfet , bipolar
pcb, point to point wiring
simple pre-amp , complex pre-amp
battery, mains supply


ARGHHHH~~~~~~~
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Old 12th July 2007, 11:10 PM   #5
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Quote:
Originally posted by jeffry_widjaja
Is difficult to make hi end Preamp
What is difficult and what is high end ?

I've started putting together a preamp design that has 300 active devices, 250 capacitors and 600 resistors in the amplification sections alone.
Likely very high-end, but do you care to do the same ?
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Old 13th July 2007, 01:55 AM   #6
anatech is offline anatech  Canada
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Hi Jeffry,
I guess a true high end" preamp is one that sounds very good to many people who are familiar with this class of product, and has reasonable specifications. I would expect the finish to be presentable.

Can you build one? Probably. You just need to set your priorities and build it some how. An existing design is fair game.

Hey Jacco!,
Quote:
I've started putting together a preamp design that has 300 active devices, 250 capacitors and 600 resistors in the amplification sections alone.
You're smuggling parts again, aren't you!

-Chris
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Old 13th July 2007, 04:05 AM   #7
sandyK is offline sandyK  Australia
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Default Diy Solid State Preamp

Jacco
Any Stereo preamp that has 300 active devices,250 capacitors, and 600 resistors in the amplification section alone,
(unless of course, you are being facetious, and counting the internal bits inside a few integrated circuits !) is sure to be high end in price only.
I would have thought that you subscribed to the K.I.S.S. principle ? Smacks a bit of Dinosaurs and pink pigs , aimed squarely at some forum members!

Regards
SandyK

P.S. Sincere apologies in the unlikely event that you are being deadly serious.
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Old 13th July 2007, 06:14 AM   #8
Nordic is offline Nordic  South Africa
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I can recommend only one DIY preamp at this stage... pedja rogic's jfet buffer.
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Old 13th July 2007, 07:36 AM   #9
MaxS is offline MaxS  France
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Hello sir,

I remember a PMA project called Dispre. Full of his favorites BJT.

diyAudio thread :
Preamp concept

BOM :
http://www.kubusmaximus.com/symasym/....php?id=dispre

The last one :
http://www.holgerbarske.com/news/index.php?shownews=209

If you can get DPA-111 schematic, send me a copy

-----
EDIT : I've forgotten the schematics
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Old 13th July 2007, 08:21 AM   #10
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Fully balanced, left and right channel.
Discrete Class A opamps, input opamps below and output opamps on the top of the pic.
JFET/ BJT/MOSFET devices.
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