Leaderboard

I did successfully build both GR78 and GR79 using the GB boards. First of all, you need some capacitance on the output for the regulators to work. That's the first thing I would try. I did have an issue with GR78 at first and finally figured out I used the wrong part (used HN4A51J instead of HN4C51J). But try adding some capacitance on the output ends first.

Jim. I've always read that placement of the subwoofer isn't that critical. I myself have found this to be wrong. I'd say play around with placement, crossover frequency and level. I've had several systems with subs, and have usually found that in the case of front firing subs, lining up the the driver with my monitors has produced a more aligned and natural sound. Room corner placement can help with A/V systems, but IMO is too wooley for music only systems. In general a sealed sub is better for music as well. As Bryan stated, I think the "more is better" idea grabs you at first, because you're hearing all this bass you've been missing, but I think eventually you'll find yourself setting the crossover higher, and the level lower. Every room/system is different, and it's not a quick dial in, but keep playing around and you'll get there.

On a bus in Hong Kong.

Matt Elliott, Farewell to All We Know bleak music

In his videos, the Nekkid Watchmaker says his name is Joe.

The only case that I know the brisket fairy has is a Louis Vuitton.

Getting ready to reheat for dinner but early snacking is promising.

The brisket finished crazy fast after I wrapped so clearly the cook times on the Traeger are going to be quite a bit different than the electric smoker. Not too concerned about it being done early, I'll just have to check the internal temp about an hour before dinner and reheat as needed. Felt super tender to the probe so here's to hoping I got this one right.

It is actually possible for something with no voltage gain and no feedback to oscillate, but it's difficult to do so. a lh0032 with the input tied to low impedance ground will oscillate.

So I built I fire today... This will eventually be a golden reference bias supply / doubler (because over-kill has no limits). My probe apparently touched something it shouldn’t have. Quite the spectacular fireworks. My heart is still racing

Finally completed the dynahi. I really enjoyed this DIY processing. Based on previous experience, this time I spent more time on selecting parts and adjustment, also increased heat sink size, quiescent current increased to 75mA. The gain keeps the original design value (200K/10K) and there is no background noise even using high efficiency earphones. Thank you everyone for your experience and information on this thread.

...wait, there is more!! I woke up early so what better than strip this shit down. First off was to remove the transformer and I found this: Notice the wire coming off the IEC and into the end of the fuse holder...and another wire connected to that pad? Yeah... I don't see any evidence that there had ever been any solder on that end of the fuse holder and the insert which holds the fuse is indeed missing. That would explain why, when the PSU blew it left this mark on the chassis At least the IEC input is nice... Gotta have that gold plating. I also don't understand how anybody could put "copyright" on this PCB with a straight face: It's two traces between two terminal blocks... ok. Now the real price, lifting the amplifier boards: Notice the nice line of standoffs...yeah not connected to anything: The heatsinks just sat on them, not connected in any way. So this thing has been shipped and the only thing securing the sinks are the transistor legs!! Spoiler alert but what could possibly happen... So 3 screws hold the amplifier boards to the chassis but no lock washers anywhere and everything was loose. What a great way to support some of the heaviest objects in the amp.

Here's my KGSSHV build to offset all the fantastic, professional-looking ones posted in this thread (milling your own front plate?!). I had an old computer case lying around, so used that as the chassis. Thanks a lot to Spritzer. I started with his kit and BOM, and then exchanged about a hundred emails with him. I lowered the values of the pull-down resistors on the amp boards to eliminate hum. Other than that, the thing worked the first time. The player is a HiBy R6Pro, and I'm listening with Koss ESP/95X phones from Massdrop.

its from the KGST GB, bhultraminipsv4 I think

I heard about this. Really a shame and kills a wonderful DIY spirit here.