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Old 8th August 2008, 07:10 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, 08:22 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.

Cheers,
Ian
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Old 8th August 2008, 08:31 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, 03:32 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, 06:47 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.
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Old 8th August 2008, 09:12 PM   #6
Jeb-D. is offline Jeb-D.  United States
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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.
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Old 9th February 2009, 12:56 AM   #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, 01:01 AM   #8
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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
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Old 9th February 2009, 02:30 PM   #9
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Default Re: OpAmp Swap?

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.
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