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In Reply to: RE: OPA2107 and Known Knowns posted by Tweaker456 on May 24, 2016 at 20:35:34
To break in you need to have signal going trough. Play some music... :)
In my revox CD player I had to add bypass caps, 0.1uF between V+ and V-, and 0.1uF between V- and ground, on the legs of the opamp.
That said, wheter this would be necessary in ur circuit I can't tell; my revox lacked any bypass caps close to the opamp, but most modern circuits have them.
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Quite a few IC's can be biased into Class A with very good results.
I was planning on doing some upgrades to the Pioneer Elite PD-59 CD player I got today to use a transport to use with my Musical Paradise DAC (great sounding DAC). Upon inspection of components it has some Elna Starget caps and some other brown looking caps (I will have to remove one to see exactly what it is). This CD player sounds really nice in stock form with the Tube/Mosfet headphone amp I hot rodded.
This deck is known to have that "Stable Platter" design where you have to place the CD upside down on the heavy platter. So I may do the PS upgrade and leave it at.
I'm still waiting on my Nichicon KX caps for the DAC to come in next month. This should really make the DAC sound even better!
Agree, some of the "compatible" bipolar chips sound very nice biased into class-A, nicely smooth. Also a fair bit hotter, which I usually think is good for SS amps of any size, SQ-wise.
I find it hard to believe that somebody who likes the TL072 is going to prefer this though, but then there are quite a few variants of the TL072 and I have to admit some are quite pleasant, especially considering the much higher price of the "better" bipolar chips. My prob is the TL072's slew rate, it can hold them back in some "quality audio" apps.
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