Ampkit alternative6/13/2023 ![]() ![]() Bass boost adjustment requires opening amp.Requires at least decent soldering skills.Well-designed PCB screen print eliminates confusion.Sound is highly configurable to user taste. ![]() If Korg releases a future (or alternative) model, I'd like to see a built in USB DAC so we can bypass the phone's internal amp, but for the price and the sound, it's a good value. It is also probably the lowest cost portable tube amp on the market that is properly implemented and doesn't suffer from any microphonics what-so-ever. It's a little more lush than amps like the Chord Mojo and iFi xDSD. Overall the sound is very full and engaging, warm, dynamic and non fatiguing, just the way I like it. So bottom line, is this piece of kit worth your time? If you enjoy tube sound and want it on the go, I'd say definitely. The bass boost I liked better for poorly recorded rock that lacked body, but was a little aggressive with already bassy music. I tried both op amps, liking the basic JRC for alternative rock with more electric guitars (overdriven guitar sounds more raw) and the Muses 01 for the indie rock I prefer which is more electronic and vocal based (smoother, more balanced presentation). I found that I liked the load on the anode a little over halfway and the volume a little under halfway turned. Once the build is complete, there are a host of fun little things to tweak like the internal gain, the load on the anodes, a bass boost switch, and choosing which op-amp you prefer. I also found myself using a solder sucker a little bit to tidy up the joints, but I'm more OCD than most The entire build took about an hour and a half, and I like to take my time. I would recommend having at least decent solder skills or plan to use some extra flux to ensure you don't bridge any eyelets accidentally. A couple of the parts need to be visually distinguished, like the codes on the side of the different value trim pots, and the solder eyelets are a little on the small size and close together, but there is nothing particularly difficult about the build. "connector", but since there are so few parts to worry about it's pretty easy to just visually check the board and confirm. There was an instance that I wasn't quite sure what the BoM was referring to e.g. The instructions discuss the order in which the PCB is populated, and refer to a numbered bill of materials. In the parts baggies are a variety of Nichicon caps, trim pots, standoffs, switches, a smaller PCB for the NuTube to mount on, and a couple of op-amps. The top is a dark piece of translucent acrylic which has the labels for the controls printed on it. The case resembles an Altoids mint tin case in both size and material, which is commonly the enclosure choice for a CMoy. I personally don't mind as I don't enjoy futzing with teeny tiny SMD resistors. This is similar to Elekit's portables that knock out some of the steps. Included in a relatively non-descript box are the instructions in Japanese and English, several baggies with parts, the enclosure, a sticker, and a PCB which is semi-populated with SMD parts. I was thinking the exact same thing, however I'm pleased to note that Korg has completely eliminated this concern in the new portable headphone amp (the HA-K1) by mounting the Nutube off the main board and using a modicum of foam to dampen things.īeing the ravenous DIYer that I am, Pete was kind enough to send me an HA-K1 to play with. Some of you may say "wait a minute! the NuHybrid was sensitive to vibration, I can't imagine it bumping around in your pocket or getting stomped on during a performance". Both make a lot of sense given the low power requirements of the NuTube: a portable headphone amp and a guitar pedal. The NuHybrid used the 6P1 as a driver tube for a desktop headphone amp with very good results.īack to October 2018, Korg has not been resting on its laurels, and has released a couple of cool new DIY designs. If you're not already familiar with the NuTube, the current model is called the 6P1, which is a thoroughly-modern, dual, very low power, directly-heated triode tube. Flash back to mid-2017 and you may remember the super cool "NuHybrid" Headphone Amp that Pete Millett designed around the Korg NuTube. ![]()
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