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Bear in mind that OPA164x are JFET input opamps so they are alternatives for TL07x/8x series. JFET opamps makes sense in very high impedance applications such as microphone gain stages, vinyl cartridge amplifiers etc. Bipolar input NE553x series are workhorses of audio industry, especially in...

In general, you don't need any opamp besides NE5532/5534 and NJM2114 (improved version).

A current output DAC's I/V stage would be the most reliable way to test OP-AMP rolling. Otherwise it doesn't really matter at all.

Yes they're usable, at least to my experience. To make sure that the frequency of the module is precise, we need to have a precision laboratory frequency counter. You have to look around (Electronics technicians, Universities, Mobile phone services etc.)The board has a high quality 5V voltage...

I think square wave output well behaved with X26 Pro's internal circuitry. I like the external clock a lot. I'm getting the crispness of the vinyl records which resonates well with my listening taste.

My Fav Composer: check My Fav Piece: check My Fav Conductor: check

It seems that the clock requires about 3 minutes to stabilize:

Thank you for sharing your honest opinion. Similar results as mine. I described the vocal difference as "bolder". Vocals seemed to me more prominent than before. Have you any access to a precision frequency counter for tuning the clock? Clock requires about 5 minutes to stabilize if I'm not...