Panda Headphone Amp

Another half-arsed half-finished project… 😀

This is a hifidiy.net HA-1 mk2 headphone amp, also known as the “Panda” amp. I bought the kit a few years ago when this amp was FOtM (“flavour of the month” – or as some would say “fad of the month” :D), but of course I don’t really need any more headamps and so it was just lying in my box of “may need at some point” unassembled kits. However, I few weeks ago I was cleaning looking through said box and found it again, and since I felt like soldering something that day I started working on it.

Unlike most “cheap” kits, this actually comes with decent components. I replaced a few components for cosmetic reasons and bought new main caps because the ones provided did look a bit worn, but other than that everything is what was provided. The amp is an all-discrete design with JFET input stage and a BJT output stage, so I had to do some matching to the input FETs, but other than that it is a straightforward build. Initial impression is that the sound is very good, but one of the reasons for the hype around this amp originally was that it is supposedly very good with AKGs and so I need to dig out my K501s and K701s to try that as well (they’re in another box..) 🙂

Now, I am still counting on the upcoming x-mas break to give me some time to finish some builds, but it’s unlikely that this will be one of them. When I started putting the board together I just wanted to do some soldering, but I didn’t have a case design in mind then. I still don’t to be honest, and since I’ve used 35mm tall heat sinks and capacitors the board is now too big to fit into a 1U modushop case – grr!

Maybe it is time to head to ebay for some “inspiration” instead then? 🙂

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