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New Millett Hybrid Maxed Amp - Page 5

post #61 of 6564
4/26/07 at 9:37pm
If I recall correctly there are actually only a couple of actual manufacturers of the tubes used in the Millett (like 3 or 4). Most of what you're going to find are just rebranded tubes with no internal or sonic differences. That said, there may have been production differences throughout the various runs of the tubes but honestly I've put that much stock in trying to roll all that many tubes through my Milletts. Put in a set, bias them and figure out if they sound good to me. Everytime you roll tubes you really should check the bias on the amp, I've had different FK6's (my tube of choice) bias WAY different.

My 2c,

Nate
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post #62 of 6564
4/30/07 at 8:05pm
Just got my board from Colin, thanks. So its on like donkey kong.
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post #63 of 6564
5/2/07 at 9:00am
I got the last two proto boards... this is gonna be awesome!!!
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post #64 of 6564
5/2/07 at 10:43am
Quote:
Originally Posted by vixr View Post
I got the last two proto boards... this is gonna be awesome!!!
You bet! I think you will be impressed.
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post #65 of 6564
5/2/07 at 12:10pm
noooooooooooooooooo
no proto boards for me?
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post #66 of 6564
5/2/07 at 3:48pm
Man, i've finished hte PSU section and i've only got to put in the muting circuit and the buffer then I'm done! I LOVE DIY! SO AWESOME! This right here is why I'm going into electrical engineering. Such an awesome hobby!
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post #67 of 6564
5/3/07 at 5:18am
Quote:
Originally Posted by vixr View Post
I got the last two proto boards... this is gonna be awesome!!!
group buy coming up eventually i assume ?
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post #68 of 6564
5/3/07 at 8:08am
Quote:
Originally Posted by adfinni View Post
group buy coming up eventually i assume ?
Yes. We're waiting until a couple more of the 2nd proto's get built, just to make double sure it's fully vetted.
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post #69 of 6564
5/3/07 at 4:10pm
Quote:
Originally Posted by tomb View Post
Yes. We're waiting until a couple more of the 2nd proto's get built, just to make double sure it's fully vetted.
hehe, so some of us DIY 'noobs' don't get too confused. I'm feeling at a loss as it's been at least 3 months since ive used my soldering iron
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post #70 of 6564
5/4/07 at 10:06pm
Quote:
Originally Posted by adfinni View Post
hehe, so some of us DIY 'noobs' don't get too confused. I'm feeling at a loss as it's been at least 3 months since ive used my soldering iron
3 months!!! I cant go three days!!! but, I can stop any time I want...
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post #71 of 6564
5/4/07 at 10:08pm
is there any significant changes worth mentioning to the BOM posted?
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post #72 of 6564
5/4/07 at 10:46pm
Quote:
Originally Posted by vixr View Post
is there any significant changes worth mentioning to the BOM posted?
Well, so far as teh output buffer goes, I bought the MOSFETs from AMB.org, and we're having some trouble getting it to work. You might want to get the standard MJEs until we get it working...
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post #73 of 6564
5/4/07 at 10:48pm
Quote:
Originally Posted by vixr View Post
is there any significant changes worth mentioning to the BOM posted?
Nope - assuming you're referring to the version dated 4/29/07. The cap sizes listed are minimums. You have a lot of latitude if you use your selection of heat sink height as the cap height limit.

Also, the MOSFET version of the buffer has not been vetted, and Bperboy is having a little trouble trailblazing it. So given a choice, stick with the output transistors. There are several working versions of that option built and performing well. Biasing the transistors for something between 30-50ma should be pretty straightforward. I prefer the higher bias, myself.

EDIT: Oops - I see Bperboy has posted already. The MJE's are OK, but the 2SC's are a cut above. BDent or MCMinone are good sources.
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post #74 of 6564
5/4/07 at 10:56pm
On other thing to note - the transistor version should jumper out the RB8L/R and RB9L/R resistors. Also, the otuput transistors use the smaller silkscreen outlines.
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post #75 of 6564
5/5/07 at 12:34am
Well, count me in and looking forward to the group buy. In the meantime, I'll build my "regular" MH to get back into the swing of DIY, then move on to the Max.

Great work, guys, and thank you!
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