DCAudioDIY.com

Agreeing with Grover. I've also had leakage issues with some, eight others have never leaked. Just grab a little epoxy and seal the ends. Problem solved and great sounding caps.

Grover had another cap recommendation that has worked well for me: Cornell Dubilier Knowles 942C series. Look for the highest voltage available.

https://www.digikey.com/en/products/filter/film-capacitors/62?s=N4IgjCBcoEwAwBYCcVQGMoDMCGAbAzgKYA0IA9lANohwB0YABAK0BiIpdYArM2x7TBi92NWggDswgLqkADgBcoIAKoA7AJbyA8pgCyhbPgCuAJ0IgAvqQC0MVCAyR5JoyXJUQXEFKshrEaAcsPCJSCkhqAGZIgA5vX2sEe0ccAjdw6jA4JG54iwsgA

The catch is, they don't sell a 0.33uF. Depending on the circuit, you may be just fine with a 0.22 (LF Rolloff?)or 0.47 (stability?) Or, you could parallel a 0.1uF & 0.22uF.

Stuart

Well, if you're going to try the Cornell-Dubiliers you can go up to 1uF. The only reason I recommended the smaller Miflex is because the 1uF's are just so enormous. They won't fit on the board but you could off-board them to a terminal strip. But they're also pretty expensive.

I will get to upgrading the caps eventually. Have a couple of higher priorities.

As I am running audio thru HQPlayer upsampling, intend to try out room correction with HQPlayer’s convolution engine.

Just installed Linlai WB2A3s, I got from China-hifi-audio. They are driving the mid horns from 700Hz to 2400Hz. They do bring life-like quality to vocals.

Here is a light edit that polished the flow, corrected minor typos, and leaned slightly into audiophile terminology while keeping your exact voice, structure, and tone completely intact:

Since I got the Tubes4HiFi VTA SP14 preamp about three months ago, I’ve been having a blast with audio again—it’s been a welcome distraction from life.

I've made numerous changes and improvements to the system recently, with a couple of key lessons learned along the way:

Holo Spring 3 R2R DAC performs significantly better with a PCM signal at 1.4112 MHz compared to 705.6 kHz.

As of now, I actually prefer PCM 1.4112 MHz over DSD1024. I’m finding DSD to be a bit "polite" by comparison—though obviously, I need more long-term listening sessions to really nail down the subtle nuances.

HQPlayer elevates the entire system. Using it for upsampling has proven to be perhaps the best bang-for-the-buck upgrade. Going back to standalone Roon (no oversampling) sounds "crude" in comparison.

My prior experiences with DSP were disappointing, but I recently tried HQPlayer's convolution engine for room correction, and I am completely sold. I couldn't detect a trace of signal degradation—instead, I notice better texture, details, and soundstage. It's a fantastic tool; definitely worth trying out even if you're running traditional box speakers.

Thanks for the update! Glad things have come together and you're enjoying your system!

Thanks Grover.
As you can tell, I am obviously excited. My system never sounded this good.