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Yes, I was being facetious, however I think the upcoming ZMF Bokeh has been described as Harmon-ish, but with more midbass. Of course ZMF headphones are beautiful, but what I think makes Zach's work interesting is his curating a product line utilizing various driver materials and a focus on the...

Don't even bother dude, this type of argument has been attempted numerous times without success, it goes against the ethos of the forum and as such holds no water here. The sooner you can tune out the objectivist and subjectivist extremists, the sooner you can put the petty arguments aside and...

I own this headphone. I didn't buy it, Zach is a friend and I get headphones in trade with him, I build him amplifiers. I think the Caldera is great, it's a very enjoyable listen, very spacious, liquid/smooth timbre, flat bass. I don't live and die by the measurements however, so take that as...

Yo! Showing off another completed build. Another one for my buddy Zach of ZMF Headphones. This is a cost-no-object 2A3 headphone amplifier featuring nanocrystalline core interstage and output transformers from Monolith Magnetics. The transformers are huge given the high permeability cores...

I believe I bought them from the same place in Italy. Shipping from Italy is expensive unfortunately.

Hello! Just finished a long term project restoring a Thorens TD 125 MKII I picked up at a local used hifi shop, thought maybe people would like to see. For those unfamiliar, this was the follow up to the famous idler drive TD 124. It's a suspended subchassis belt drive turntable with a Wien...

Here's one more pic of the DAC next to another tube headphone amp I designed that uses a choke-loaded parallel section 6SL7 input stage capacitor coupled to a transformer-coupled cathode follower EL34 output stage (I don't think I shared that build on ASR) and the ZMF Caldera headphone.

Thank you! Yes, what can I say, I am buying into the voodoo. And that is based on my personal experience hearing these types of designs. Five years ago, before I was heavily into DIY audio, I would have balked at owning a NOS DAC, I firmly believed the measured performance of a DAC was all...

Ahh who knows, but the result is excellent (subjectively speaking), I am extremely happy with it. Listening in my system, it is a transformative piece of gear. It amplifies that "at the venue" listening experience for live recordings where you feel you are listening into the recording space...

Well I finished my PCM63 DAC! It sounds excellent, to me, but it isn't winning any measurement awards given the output stage I used, so I think I will refrain from making a dedicated thread for it. Even if I sing its praises and say it sounds better than the better measuring DAC of this...

Just glancing at the circuit, the parts used look to be comparable, it is just built out on a PCB as opposed to point to point wiring.

As far as I can remember, it is a passive AC supply with one leg tied to ground, no center tap.

Hey @Nate29 , Creating a virtual center tap and elevating the heater supply is worthwhile if you are having issues with noise / hum. You could try the center tap first then elevate the heaters if there is still a noise issue. I would try that first before the "Fitz mod". This mod is simply...

Did some testing of my parallel PCM63 DAC. I configured the JLSounds I2SoverUSB module for PCM63, made connectors from the module to its power supply PCB and the left and right channel DAC boards. Then I connected everything up in a janky way for the sake of testing. Since these PCM63 chips...

Thanks! I use EasyEDA, free software of the board house JLCPCB.

I finished designing and assembling the boards for my NOS PCM63 DAC. Running two PCM63 in parallel per channel, output of each is the parallel Iout pin of the two chips. Planning to again use Sowter SUT I/V with some sort of tube output stage, likely a buffer with the SUT wired 1:10. Put the...

Yes, you could build something similar for 2A3. You would need to adjust the filament supply to handle the higher current of the 2A3 (2.5A vs. 1.5A of the 45). You would also want to use a different output transformer, Sowter makes a 2.5K parafeed transformer for the 2A3, the 8995. I no...

Hmm that's quite an unusual bug, are you within the return window? Honestly I would try to return it if you can, unless you have a tech nearby who could take a look at it, not easy to do over the internet. And I'm sorry, this was a one off "for fun" thing to do, so not available as an upgrade...

Thanks, I appreciate it. I'll give your I/V stage some thought. What chip are you using these days?

I saw this guy's interviews on Steve Guttenberg's YouTube channel a while back. Seems like a chill, down-to-earth guy who is passionate about making high sensitivity speakers and tube gear. Looks like a cool system, I'd love to hear it.