OpAmp Swap?

edge4syn · 8th August 2008, 06:10 AM

I own a pair of Shanling SP-80 Monoblocks. For those of you who don't know these are really integrated monoblocks. As many have found the Amp section is a fairly good design, however the Pre is lacking. Right now these have a Chinese OpAmp (opa2604ap). My question is whether or not I can drop in a Burr-Brown(now TI) opa627ap without any other modifications? Thanks in advance. If you need more info let me know, I'm an amateur at best.

gingertube · 8th August 2008, 07:22 AM

The OPA2604 is a dual op amp while the OPA627 is a single.

Someone does make an upgrade which consists of 2 OPA627 surface mount chips on a board which plugs into the old DIP8 socket. Perhaps search "Shanling Upgrades".

I know this because I'm working on a Shanling CD Player right now which has this upgrade in it.

Cheers,
Ian

Mooly · 8th August 2008, 07:31 AM

The OPA2604 is one of my favourites subjectively for audio. I would be interested to know the results of your swapping it for something else.

coresta · 8th August 2008, 02:32 PM

sand is unwelcome here

there are tons of topics on DIYaudio about OPA604, 2604, AD826 and ...

Pierre

leadbelly · 8th August 2008, 05:47 PM

It is weird to discuss opamps in this forum

One other thing you need to check (measure) is what rails are the 2604 powered by? The 2604 accepts +/- 24V rails, which a 627 won't, and since we're discussing a tube amp, the higher rail voltage may well be why it was chosen.

Jeb-D. · 8th August 2008, 08:12 PM

Quote:

Right now these have a Chinese OpAmp (opa2604ap)

Isn't BB the only one that makes the OPA2604? It's a pretty good op-amp, I'd leave it.

truajb · 8th February 2009, 11:56 PM

I replaced my 2604 with OPA2227 and it sounds really good. i am still waiting for them to burn it and hopefully they sound even better.

Bandersnatch · 9th February 2009, 12:01 AM

hey-Hey!!!,
Google up 'Brown Dog Adapter', and you'll find what you're looking for. I dug these guys up while hunting DIP style OPA4134 and found them no longer available. I was into a Rane AC22B actove cross-over that had( errr...still has ), some issues.
cheers,
Douglas

whitelabrat · 9th February 2009, 01:30 PM

Quote:

Originally posted by edge4syn
... without any other modifications?

What?! Just for posting to the Tubes forum I think we should suggest a
tube op amp alternative.

Not sure if that schematic is any good. Here is a thread that touches on the topic.

8th August 2008, 06:10 AM	#1
edge4syn diyAudio Member Join Date: Aug 2008	OpAmp Swap? I own a pair of Shanling SP-80 Monoblocks. For those of you who don't know these are really integrated monoblocks. As many have found the Amp section is a fairly good design, however the Pre is lacking. Right now these have a Chinese OpAmp (opa2604ap). My question is whether or not I can drop in a Burr-Brown(now TI) opa627ap without any other modifications? Thanks in advance. If you need more info let me know, I'm an amateur at best.

8th August 2008, 05:47 PM	#5
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	It is weird to discuss opamps in this forum One other thing you need to check (measure) is what rails are the 2604 powered by? The 2604 accepts +/- 24V rails, which a 627 won't, and since we're discussing a tube amp, the higher rail voltage may well be why it was chosen. __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

9th February 2009, 12:01 AM	#8
Bandersnatch diyAudio Member Join Date: Jul 2003 Location: Ann Arbor, MI	hey-Hey!!!, Google up 'Brown Dog Adapter', and you'll find what you're looking for. I dug these guys up while hunting DIP style OPA4134 and found them no longer available. I was into a Rane AC22B actove cross-over that had( errr...still has ), some issues. cheers, Douglas __________________ the Tnuctipun will return

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8th August 2008, 07:22 AM	#2
gingertube diyAudio Member Join Date: Oct 2004 Location: Adelaide South Oz	The OPA2604 is a dual op amp while the OPA627 is a single. Someone does make an upgrade which consists of 2 OPA627 surface mount chips on a board which plugs into the old DIP8 socket. Perhaps search "Shanling Upgrades". I know this because I'm working on a Shanling CD Player right now which has this upgrade in it. Cheers, Ian

8th August 2008, 07:31 AM	#3
Mooly diyAudio Member Join Date: Sep 2007	The OPA2604 is one of my favourites subjectively for audio. I would be interested to know the results of your swapping it for something else.

8th August 2008, 02:32 PM	#4
coresta diyAudio Member Join Date: Mar 2005 Location: Paris	sand is unwelcome here there are tons of topics on DIYaudio about OPA604, 2604, AD826 and ... Pierre

8th February 2009, 11:56 PM	#7
truajb diyAudio Member Join Date: Feb 2009	I replaced my 2604 with OPA2227 and it sounds really good. i am still waiting for them to burn it and hopefully they sound even better.

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