A BIG Thank You to my Patreon supporters. You made the purchase of this gear possible! It is priced fair for what it is, but $600 is a stretch for me.

Nice John! I’m glad you could get this! I just got mine but have had too much going on to show it. I have big plans for it:) It will be fun to see you use it!!

The time has come to see real measurements for JAT-501. Mixed feelings because I was used to see and hear about the " 1% pilot signal distortion". I'm glad with your glad John

Haven’t been on your channel in a while and very excited for this piece of tech. I’ve watched you for several years now and you’ve talked a lot about this upgrade. Glad you finally have it. Now you can go back and re-measure everything! Just joking but am looking forward to seeing it at work.

Didn’t know I needed one of these, but I probably want one for my upcoming 60th birthday. Thanks for the review!

This is something I will probably never have, but it's so good to learn something new. Thanks a lot for your videos!

I will be excited to see what is coming with this new kit! Awesome Sauce!

Hey John! Glad you got it! Let me know if you need that USB power insert board and data pass through board I made. Helps a lot with mine.

What an awesome piece of kit. I feel a whole bunch of previous built and tested amp kit retests coming. Again awesome!

input gnd and usb gnd are isolated, so if you want to remove that 60hz ripple you can connect input and usb grounds together and that should ground the circuit

Looking forward to seeing it hooked up to your amplifiers !

So awesome people like you and others who know what they are talking about with this kit are doing videos I am thinking of dusting off my piggy bank and start filling it again. Please do a proper look at the specs of a JAT501 and fiddle about with stuff ! nice one John.....cheers.

I got mine last week. I'm learning how to capture the THD harmonics as a bar graph, that is most useful for me. The frequency response curve of course too. And power vs. THD would be helpful too in my Amp building. It would be great to see one video dedicated per function of this unit, with wiring, and what buttons to push etc. It can be a bit complicated.

Test the JAT501 & JAT801 THD soon

Nice. I've been muddling along with the Lossless Audio Checker and SPEK.

Just a thought: If you ever needed to use your “Feel Tech” sig gen, take that %THD away from the Amp's output %THD - there might even be an offset facility within QA403, great bit of kit, but way too expensive for me.

I look forward to seeing some frequency response stuff. I wonder what the highest frequency this thing can handle is? I think 24 bit/192kHz .flacs save everything, I've seen up to 30 kHz in some of them, according to SPEK.

Using BNC connectors for audio is unique

Great! For $600 it is quite a bargain. I don't know if you are aware how much Audio Precision is asking for their products.

You need a small tripod. I'm sure you already know this. 😂

Very good thanks

Nice toy!!!

I've thought of this unit. But I need more than just THD, I need to know the level of each individual harmonic, 2nd, 3rd, 4th and 5th. Amplifiers might have low THD but they sound bad because its all 3rd harmonic distortion. And an amplifier with 1% 2nd harmonic distortion will sound better, even with the high 2nd harmonic distortion. Higher distortion at the even harmonics are musical, but even a small amount of odd harmonic distortion is dissonant. Can this unit graph out the individual harmonics? Or is it still limited to only doing THD?

An interesting device, but... "Note: The software uses a proprietary link to the hardware. You don't need to install a driver, but be aware the hardware will not work with other software applications. The benefits of the proprietary link are numerous. But the biggest win is that we can guarantee a bit-exact communication link that is immune from hidden sample rate conversions and bit depth changes common with UAC devices. " Not quite a deal-breaker, but that's pretty bad, and that "biggest win" bit is an outright lie.