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Old 8th August 2008, 06:10 AM   #1
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Default 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.
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Old 8th August 2008, 07:22 AM   #2
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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.

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Old 8th August 2008, 07:31 AM   #3
Mooly is offline Mooly  United Kingdom
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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.
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Old 8th August 2008, 02:32 PM   #4
coresta is offline coresta  France
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sand is unwelcome here there are tons of topics on DIYaudio about OPA604, 2604, AD826 and ... Pierre
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Old 8th August 2008, 05:47 PM   #5
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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.
The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts. Bertrand Russell
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Old 8th August 2008, 08:12 PM   #6
Jeb-D. is offline Jeb-D.  United States
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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.
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Old 8th February 2009, 11:56 PM   #7
truajb is offline truajb  Canada
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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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Old 9th February 2009, 12:01 AM   #8
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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.
the Tnuctipun will return
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Old 9th February 2009, 01:30 PM   #9
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Default Re: OpAmp Swap?

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.
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