非常感謝 if any high-hand can tell me information about the replacement of the following Op-amps in order to have better sonic performance.

1) BB (Burr brown) OPA2604AP 9912 9043

2) SSM2017 916 G21010 0

請問2604後的英文字母”AP”也有级别之分？

OPA通常有如下的grades : SM＞BM＞AM＞BP＞AP。

"""..SM＞BM＞AM＞BP＞AP。 前三者是 in metallic cans 而後兩者是 plastic coating..."""
http://www.hiendy.com/hififorum/forum.php?mod=viewthread&tid=27231&extra=&page=4

To upgrade from OPA2604, can try :

Modest price : LM4562, LME49720
Expensive ones : OPA627BM [$3xx/single piece] or OPA627SM [$6xx/pc]. Need converter PCB to make a pair to fit into DIP8 socket for each 2604.
Discrete opamps : Dexa/NewClassD dual about USD7x/pc.

If space permits, Dexa is even better than the OPA627BM which I also used before.

最後修改時間: 2013-05-22 10:53:55

非常感謝Diwily 兄！

請問用 discrete opamp 是否一代一ok, 不用加別的东西？

另外item 2 是否opamp IC?
可升級吗？

＞＞＞..discrete opamp 是否一代一ok
-----------------------------------------
It depends:

(1)腳位?
(2)電壓?
(3)單運放vs雙運放?
(4)外置件配合?
(5)體積/空間?

請問用 discrete opamp 是否一代一ok, 不用加別的东西？ Yes, NewClassD fits many opamps without any change to socket pin configuration or change to circuits.
You have to copy & paste the links.
Link to NewClassD from Denmark:
"http://www.newclassd.com/index.php?page=55"

Link to another discrete opamp Burson form Australia:
"http://bursonaudio.com/DIY_HD_Opamp.htm"

Note that Burson draws higher current than others.

另外item 2 是否opamp IC? Yes.
可升級吗？ Discrete opamp is the best grade of opamp, much better than IC. You may search in the web.

Pls check PM.

最後修改時間: 2013-05-22 13:35:59

Here is the photo! Any more comments please.

SSM2017 replacement suggestion

http://blog.audioworkshop.org/ssm2017-line-preamplifier-high-quality-design/#.UZxjTZyTsgQ

師兄：
INA219 代替 SSM2017 的 config 一樣，直接換就ok？
此IC 高级過SSM2022 好多？ 多少錢？

感謝！

Looking more carefully, the 3 pcs opamps are of DIP8 configuration, but they look like being soldered. There seem to be no socket on the PCB. You may double check.

Low-Noise, Low-Distortion
INSTRUMENTATION AMPLIFIER
Replacement for SSM2017

http://hk.element14.com/texas-instruments/ina217aip/ic-amp-instrumentation-pdip8-217/dp/1212423

最後修改時間: 2013-05-22 18:27:20

Do not know if it outdated??

"""As SSM2017 is a device/amplifer with very good caractaristics
it is hard to recommend anything better."""


http://www.audioasylum.com/cgi/t.mpl?f=tweaks&m=53045

http://tangentsoft.net/audio/opamps.html


http://sound.westhost.com/dwopa.htm

Thank you very much for esquire and cornercube 师兄的意見！

我知原裝粒IC outdated 左。

INA217 should be superior to it?

唔贵！ 可試吓！

I mean to say:
粒原裝IC依然靚聲,
即使條‎thread已經超過10‎年.

So, i don't know if INA217 is just a replacement because of outdated chip or it is a upgrading.

I think 217 is just a replacement for 2017, not a upgrading.

但從失真率看 INA217 = 0.004%, 而 SSM2017 ＜ 0.01%。
我是行外人，所以唔識分！

多謝 cornertube 兄先！