MNATS REV D 1176 (VERSION 2.2) question

Just wanted to answer my own question in case it is useful to anyone.

Although not printed on the PCB, the polarity of these caps is indicated on the overlay included in the BOM

Pace

Hi Pace, all good questions, this thread    www.groupdiy.com/index.php?topic=20058     although huge, is the place to go, if you use the search within thread function, you will find everything you need to be successful with the Rev D build, that thing sounds killer

good luck

John, really, if I can do it you can!!!

Jump in! It is fun.

thanks Gustav

I've just started this build. Went for the complete kit (rev D) from Hairball. Just wanted to say that the care Mike has put in making these kits is just amazing. The packaging, labeling, the gorgeous metalwork, everything! Also I love the build guide, super detailed and educating. I've been a bit scared of working with high voltage, but after reading Mike's instructions on how to wire the power transformer (both U.S and EU) a few times I'm getting it. This is encouraging for my upcoming LA2 p2p build.

No worries.  AC is safer than DC to work with.  With DC your muscles lock up due to the constant current.  With AC, your muscles get a chance to loosen 25/30 times a second as the wave crosses zero!

Thanks Svart! But I do feel pretty cool this time. Had a few 'gulp' moments with the 51X rack floorbox PSU last summer. Not because it was bad but because I'm a noob and felt there were a couple of blanks I couldn't fill. Mike's build manual is perfect for me. Educating stuff. BTW, I happened to stumble on one of the old classic pics of Bill Putnam the other day. Quite extraordinary that so many of the old designs still live and that we're making the IKEA version of his creation at our homes almost 50yrs later!

I'm building a full Hairball 1176D right now.  The one thing I did after testing the power supply, was to discharge the electrolytic caps in the power supply section with an 800 ohm, 5Watt resistor I had around.  I'm not sure how dangerous they are in this build, but I got into the habit of discharging dangerous caps when I was doing my Marshall Plexi build back when.  It was one thing I noticed missing from the hairball build docs, but I think it's better to be safe when dealing with power supply builds.  I did search the build support thread to see if the question was ever raised, and it was.  Hairball said he never discharges them before stuffing the rest of the board, but it's not a bad idea.  He suggests a 200 ohm 5 Watt resistor attached to insulated clips.

Cheers,

-B

Just did the calibration on my rev D. Again, this kit is awesome! Except for the physical range of the input/output pots not matching the markings on the faceplate, which I obviously can't fix, I've had zero issues, and having all parts including cables and shrink tubes (and a nice guide on how to twist cables) I managed to make it tidy and clean internally. I don't at all understand the issues some people seem to have over at the 1176 shootout thread. It sounds just great! Compared to Purple and Don Classics rev A on drums and acoustic bass. Very close to the Purple. I believe it had a bit more lo end than the Purple and preferred it on higher input/lightly distorted settings. I'll probably have to go for a rev A eventually

Awesome.  It's an easy kit.  I think the thing that hangs most people, besides soldering issues, is that they don't read the resistors properly.  I'm pretty good at it, but I'll double check every single one with a meter.  Also, with the different versions, some resistor values are different and people don't expect that, so it trips them up a bit.  

I have a Rev A and I love it, but it's a little hissy compared to the LN versions, like rev D.