I will most likely be moving the GOBO to take on duties for my drum machine / synth setup, feeding P363 towers. For the $200 that I paid for them, they are worth every penny! Even if not the most linear FR, they do sound good to my ears, and they are an easy load to drive, and they have better deeper bass than I expected (room placement helped on that). Sure, they are probably not the most accurate out there. For the $100 that I paid for this amp, good luck finding anything better at that price point (it aint gonna happen). I am currently working on an external speaker protection circuit that should solve this problem. That has kept me from running the Philharmonitors on this amp. 2) There is a "thump" through the speakers when it powers down.
It's not a beast or anything, but it does its job well and has no hum or hiss! There are 2 nitpicks to add: 1) It could use a subwoofer out.
The GOBO from BKA: A great little amp! Small and it looks snazzy and it puts out a real ~20Wpc (8 ohm). If I had to nitpick, slot load drives aren't my favorite, but I'll let it slide for everything else that it does right. I can BARELY hear it spinning when I mute the audio and put my ear right up on it. It also has the option of fixed or variable outputs, another great option for an amp builder. The Parasound ZCD: A FINE CD player! Small so it is easy to move between amps or rooms, and that is important if you build audio gear, or have limited space. I can also turn the volume down to min and put my ear up to the ZCD and just barely hear the disk spinning. I can turn this system gain up to max with the cd paused, and I get absolutely no hum or hiss from the speakers, even with my ear right up to it. With a Parasound ZCD in silver (used off ebay for $225)Īnd the DT SM350 (new from newegg, I paid $200)įor $525, this is an incredible little desktop setup! I actually use it at my workbench where I work on electronics projects and repairs, where space is at a premium. I have been using this gobo amp built from a kit (I paid $100 for the kit, less than the current asking $160)
No posts in this thread for a while, so I wanted to give an update. However, driving it with a sin wave for measurements certainly heats it up quite a bit more than real music ever did. It barely got warm when playing the P363s. I also have a speaker protection circuit in the works to help play it safe. Obviously, risk the cheap speakers first. I may hook it up to the Philharmonitors in the near future. So far, I have only run this on my P363s. I may end up ordering another kit and doing a souped-up hot-rodded version of this kit, assuming that the chip can handle it. I am now considering looking into this chip a little deeper (LM1875). *AC ripple on the output of P/S = 200mV peak-to-peak I will also borrow some resistors to get a 4ohm dummy load for early next week.įirst round measurement results, with 8 ohm resistive dummy load: Tomorrow, I plan to try to get some THD+N measurements and In/Out Z, and maybe a 2 ch driven power measurement. I certainly hope that my continued measurements don't uncover any flaws, because I like what I hear and see and I want to like this little amp too. We don't need no stinking crimp connectors! All solder over here! My only real complaint is that the kit is made for complete noobs, and has several areas where the original design uses crimp-connectors. For the current US price of about $120 with shipping, it is a dang tough amp to beat. It is well engineered and thought out and laid out. It is obvious that these guys have a clue about what they are doing. First round of measurements are done! Let me re-state: I am nothing but impressed with this little amp! The more I dig into it and measure and learn, the more impressed that I am. Probably just as important as income would be the tax breaks you can get as a small businessman. Of course, electronics repair can be a nice little side business too. I've got some ideas, and some ideas that I could turn into a little side business of selling modular kits. After that.I guess it's time to try designing and building circuits from scratch. Next step is to mod some kits and build from schematics. Obviously, I'm about at the point that I don't have much to learn from a kit. Dang, what a rewarding and fun hobby those are, and keeping them running keeps your mind sharp for troubleshooting on mechanical and electrical problems. Plus, I have a few electric RC cars with plenty of mods and upgrades. Probably at least 1 other that I have forgotten. Quickie 1.1 Battery Powered Directly Heated Tube Preamplifier Kit | BottleheadĪnd this analog synth! Man, this was ~40 hours of work! Quickie Pre-amp with the Constant Current upgrade
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