Well this is what Google AI says.

The Ampapa D1 features an easily accessible, liftable glass lid specifically designed for painless op-amp rolling. It requires two standard dual op-amps (DIP-8 configuration). [1, 2, 3, 4, 5]
The most highly recommended op-amp upgrades for the D1, along with their distinct sonic profiles, are broken down below:
## Popular Op-Amp Upgrades & Sound Profiles

* Burson Audio V7 Vivid (Discrete)
* Sound Profile: Dynamic, highly detailed, and punchy.
  * Sonic Changes: This option brings a crisp, lively presentation with a massive boost to instrument separation, imaging focus, and a wider soundstage. Note that while they fit perfectly under the D1's glass canopy, these premium modules elevate the amp closer to a high-end sound rather than standard budget hi-fi.
* Burson Audio V7 Classic (Discrete)
* Sound Profile: Smooth, warm, and musical.
  * Sonic Changes: Unlike the analytical Vivid version, the V7 Classics trade an aggressive edge for an analog-like ambiance. It creates a greater sense of acoustic space and a smoother high-end roll-off that pairs beautifully with bright speakers.
* Sparkos Labs SS3602 (Discrete)
* Sound Profile: Ultra-transparent and technical.
  * Sonic Changes: Sparkos discrete op-amps significantly increase clean resolution and transient speed. Bass becomes incredibly tight and controlled, and the background gets noticeably "blacker" (quieter).
  * Warning: While the standard SS3602 dual-modules fit well, larger variants like the Sparkos Pro will not clear the tight physical spacing of the D1 chassis.
* Texas Instruments OPA1656 / OPA828 (IC Chips)
* Sound Profile: Balanced, precise, and transparent.
  * Sonic Changes: These are massive technical upgrades over stock chips at a fraction of the cost of discrete modules. Audiophiles using the OPA828 or 1656 in the D1 note an exceptionally clean, colorless sound with sharp leading edges on notes, excellent bass definition, and no fuzzy distortion.
* Muses 02 / Burr-Brown OPA2134 (IC Chips)
* Sound Profile: Classic "Burr-Brown" warmth, lush midrange.
  * Sonic Changes: Known for adding a subtle "tubey" lushness. They relax the harsh glare of budget Class-D treble, adding weight and organic body to vocals, though they sacrifice a tiny bit of micro-detail compared to Sparkos or the OPA828.
* Oracle II 02 (Budget Discrete)
* Sound Profile: Earthy and full-bodied.
  * Sonic Changes: Available for just a few dollars, these offer an easy entry into discrete components. They deliver a much more 3D sound than the stock chips with good physical weight, though the soundstage depth is narrower than premium Burson models. [1, 2, 3, 6, 7, 8]

## Crucial Swapping Tips

  1. Orientation matters: Ensure the notch or dot on the new op-amp matches the notch marking on the D1's DIP-8 socket. Plugging them in backward will fry the chip and potentially damage the amplifier instantly.
  2. Watch the heat: Some high-bias or discrete op-amps (like the Virtual HiFi Supersonic V2 or certain high-current chips) run incredibly hot to the touch. This is normal for class-A biased discrete op-amps, but make sure the D1 has breathing room. [1, 2, 4, 9]

Are you hoping to tame bright treble or looking for more analytical detail? If you share your current speakers or what you feel your system is missing, I can help you pick the exact right match.

[1] [https://doukaudio.com](https://doukaudio.com/products/ampapa-d1-hifi-bluetooth-amplifier-with-digital-
vu-meters-hpf)
[2] [https://www.head-fi.org](https://www.head-fi.org/showcase/burson-audio-v7-vivid-opamps.28645/)
[3] [https://www.youtube.com](https://www.youtube.com/watch?v=dr7vB-HYPhk)
[4] [https://www.pragmaticaudio.com](https://www.pragmaticaudio.com/reviews/2025/12/ampapa-d1-integrated-amplifier/)
[5] [https://www.reddit.com](https://www.reddit.com/r/diyaudio/comments/ji1nc7/dac_with_swappable_opamps/)
[6] [https://www.head-fi.org](https://www.head-fi.org/threads/ampapa-d1-tpa3255-amplifier-whos-your-daddy.9781...)
[7] [https://www.audiosciencereview.com](https://www.audiosciencereview.com/forum/index.php?threads/ampapa-x-douk-audio-d...)
[8] [https://www.youtube.com](https://www.youtube.com/watch?v=_3HWfNJFcVo&t=2)
[9] [https://www.reddit.com](https://www.reddit.com/r/BudgetAudiophile/comments/1r9wezl/supersonic_v2_op_amps...)

Only have experience with op amps in one device, Jolida JD9 phono pre. Been awhile, but the memories are with me. That unit used three pairs of op amps. Really they are similar to rolling tubes, back n forth, back n forth. Some would be very evident and others seemed to have no effect. Researching which to use and where to buy was a lot to swallow. As with tubes, the popular, hyped ones are more expensive. Where to buy them was the trickiest part, many people warned others to avoid buying from China as there was a good chance they were counterfeit. I did buy some on eBay from China, more to get a feel of what different versions would bring - or not bring to the sound. Good friend of mine has that unit now (he also has another) and he loves keeping with the sound by rolling op amps. That’s about all I have on the subject, can’t really remember which ones I used. If you go that route, good luck and have fun with it!

My take on Op Amp rolling would be to play the stock ones for a few weeks to both burn them in and to get a idea about what you like/dislike about the sound of the amp.
I'd them look at the list I shared with you to find one that would best "fix" your observation of what is lacking.

I only use my Ampapa for very low listening volumes to lull me to sleep at night. The only thing I have done is to crank both the treble and bass adjustments up to 10. I do that to emulate a loudness button so the sound works well at low volume.

I have used the Ampapa in my main system a few times with the balanced inputs fed from my Denafrips DAC. It sounded pretty good for a $170 amp, but would definitely run out of "balls" at higher volumes.

And it has VU meters! Multiple VU meters at that!

So going down the op-amp rabbit hole I came across an informative article  called “The Ultimate Op Amps for Hi-Fi Guide (2026): Precision Sound, Upgrades & Audiophile Insights”

https://www.shuttergroove.com/reviews/hi-fi/op-amps-ultimate-audiophile-guide/


Here’s another article regarding the popular Oracle -02 op amp.  

https://www.shuttergroove.com/reviews/hi-fi/oracle-ii-02-op-amp-upgrade-aiyima-a...

Donnie…yes the Ampapa showed up late last night.  The packaging of the amp was impressive.  The tolerances were so tight that it took like 10 seconds for gravity to make the two pieces detach from each other.  

Today I’m going to work on cleaning up and rearranging the desk, pulling the bookshelves from the living room, and work on setting up the system.  With motorsports racing going on today, not sure how much I’m going to accomplish.