[newzooreview]

You could just give Acopian a call. They make everything at their facility in Pennsylvania (or Florida, near NASA) and are likely to have the missing part.

https://www.acopian.com/

[bbaker6212]

Tried the SX52 op amps and found that OPA1656 sounded more clear in the mid-range with comparable bass response, at half the cost.
In my experience, the discrete op amps cost too much and don't contribute a proportional improvement in sound quality.
The Douk A5 is a remarkable small amplifier that performs well above its price class and is replacing a high bias class AB amp in my own system.
For under $130 total with upgraded op-amps & 36v power supply, it is hard to beat.

what front-end/DAC and speakers were you using?

[NXSTUDIO-DRUMMER]

Could this be the budget tube preamp companion for the Douk Audio A5?

Note: I'm not promoting this product, it's only a discovery of a rarely seen 6SN7 preamp, especially at this price point. Thought I would post, for view, in case anyone has interest. Regardless, here is a YT review link below, on this particular 6SN7 Tube preamp.
https://www.youtube.com/watch?v=9LVVyzgnpmA&t=84s
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Nlitworld,
What's the latest updates on your A5 Mod's?  How's it sounding, versus stock with all the significant upgrades you've added to this point? The AC community would enjoy hearing your feedback.