Suggested Replacement for JRC2114 Op-Amp

[jiggler]

I'm going to do some op-amp rolling in my Arcam Alpha CDP and was hoping for some recommendations here. Currently, the op-amps are the JRC2114 (NJM2114D). The specs are here: http://www.njr.co.jp/pdf/ae/ae04028.pdf. I'm thinking of trying the BB OPA2132. Any other recommendations? Thanks much!

 

[Budgie]

Suggestion- Measure the power supply voltage. The spec sheet shows that chip working up to pretty high voltages (+/-22 !) and some of the chips that would otherwise work fine in the circuit but are only rated to +/- 13 volts. I made that mistake and almost burned up a pair of AD8610 chips.

 

[Glassman]

do what Budgie said and also tell us how does it sounds now and what would you like to get after modding, we'll try to suggest you the right amp then

 

[tangent]

It might also be helpful if you tell us which part of the circuit the chips are in. Op-amps are used for several different things in CDPs, for which different op-amp specs are helpful.

 

[aos]

JRC2114 is often used in CD players for audio purposes as it's a variant of classis NE5532 so it's unlikely it's anything else but analog filter / buffer. I think I had those in my SACD 775 which I replaced with OPA2228 (which may not have been the brightest thing I did but oscilloscope later showed no oscillation). OPA2132 should be a good choice. Just measure supply voltage as suggested and measure the offset at the output after the change, to be sure.

 

[jiggler]

I just received the service manual for the Alpha 7/8/9 CDP from Arcam. It shows that the supply voltage to the op-amps in the audio output stage is +/-18 volts. Looks like the AD823, OPA2132 and OPA2228 will all work then. The schematics also show a couple of caps in the output signal path. Anyone care to take a look at the shematic and tell me whether taking them out might improve things? Thanks.

 

[Glassman]

send then to me if you want:

dominik at netpilot dot cz

 

[aos]

Just about all DAC datasheet schematics I've seen include output caps. Sometimes they are necessary because there's DC component to the signal, and sometimes they aren't but are still used for extra insurance - in that case they could be bypassed. You don't really have to remove them, you can just short-circuit them.