rcd971 opamp

beezer · 3rd January 2012, 03:32 PM

Hi, This is my first attempt ad upgrading my rcd971 rotel cd player
I bought OPA627AP and installed them but now there is no sound from the player
I've installed the opamps correctly so i'm not sure whats happened here

any suggestions?

thanks

stephensank · 3rd January 2012, 03:48 PM

Are you certain the original chip was a single opamp & not a dual? If the + voltage supply comes to pin 7, then it was a single & should be working. If it is on pin 8, then the stock was a dual, and you would need a Brown Dog singles-to-dual dip converter to use a pair of 627's in each spot. Personally, I think the 627 is way too unnaturally colored, and always instead use the OPA134, which happily comes in dual as OPA2134.

beezer · 3rd January 2012, 04:27 PM

the original op amps were BB opa2604

As far as I'm aware the 627's are drop in replacements but as I say I am quite a novice here

abraxalito · 3rd January 2012, 04:35 PM

OPA2604 is a dual OPA604 so stephensank's comments apply - you can't drop in an OPA627 without the relevant adapter.

beezer · 3rd January 2012, 05:21 PM

thanks very much I'll get these brown dog adaptors

do you think I have damaged the two I installed ?

stephensank · 4th January 2012, 03:08 AM

Quote:

Originally Posted by beezer

thanks very much I'll get these brown dog adaptors

do you think I have damaged the two I installed ?

It's unlikely that you damaged the 627's, as you did not reverse polarity, you simply applied B+ voltage to an offset trim pin.

3rd January 2012, 03:32 PM	#1
beezer diyAudio Member Join Date: Jan 2012	rcd971 opamp Hi, This is my first attempt ad upgrading my rcd971 rotel cd player I bought OPA627AP and installed them but now there is no sound from the player I've installed the opamps correctly so i'm not sure whats happened here any suggestions? thanks

3rd January 2012, 04:35 PM	#4
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 46	OPA2604 is a dual OPA604 so stephensank's comments apply - you can't drop in an OPA627 without the relevant adapter. __________________ I think ideas are what you want to get rid of. I don't really like songs with ideas. - Leonard Cohen

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3rd January 2012, 03:48 PM	#2
stephensank diyAudio Member Join Date: Oct 2006	Are you certain the original chip was a single opamp & not a dual? If the + voltage supply comes to pin 7, then it was a single & should be working. If it is on pin 8, then the stock was a dual, and you would need a Brown Dog singles-to-dual dip converter to use a pair of 627's in each spot. Personally, I think the 627 is way too unnaturally colored, and always instead use the OPA134, which happily comes in dual as OPA2134.

3rd January 2012, 04:27 PM	#3
beezer diyAudio Member Join Date: Jan 2012	the original op amps were BB opa2604 As far as I'm aware the 627's are drop in replacements but as I say I am quite a novice here

3rd January 2012, 05:21 PM	#5
beezer diyAudio Member Join Date: Jan 2012	thanks very much I'll get these brown dog adaptors do you think I have damaged the two I installed ?

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