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In Reply to: RE: upgrade op-amps for the Adcom GFP 565 Preamp posted by alley -kat on February 17, 2015 at 03:40:08
Do you need additional bypassing? Is there any RF on the signal lines? You cant cure something that isn't there. The LT 1056 op-amps are fine. You wont notice any difference. They are being used far below their limits.
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I don't own a scope or, know how to use one for that matter. I just figured since the unit is 25 years old and runs in pure class A that it might be a good idea to change out and upgrade if possible, while I'm at it. Thanks!
I bought some of these and have been quite successful. Lookup the substitution to make sure they are appropriate. I found that it substitutes for a LOT of op-amps, but maybe, not all.
The most important thing is to have the op-amp socketed, otherwise, how can you change it out? Removing a non-socketed op-amp ranges from requires some skill to nearly impossible and it depends a lot on how tight the hole dimensions are. I suspect that you will be OK with that, but I had a German made PCB with impossibly tight tolerances that was muy difficult.
LME49860 [x4] 44V Dual Low Noise OpAmp with Machined Pin socket LME49860NA
I just got LUCKY and changed out a shore power connector on a circuit board from a friends laptop device. At least 8 solder in connections. Crazy tough with my bad eyes. BUT, it worked and nobody was more surprised than I. I love solder wick.
As for opamps? Any fans of the OPA2134 ? I make copies of the CMOY headphone amp out of 'em and they are NICE. I've reached a happy place with gain and sensitivity.
Too much is never enough
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