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Millett "Starving Student" hybrid amp

post #1 of 6812
Thread Starter 


I just posted the design details of the Millett "Starving Student" hybrid amp on my website:

Starving Student hybrid

Think "Millett Max" for the financially impaired... or maybe "Millett Min"?

The idea was to design the simplest, lowest cost hybrid headphone amp possible. It still had to perform well and sound good, of course. I think I suceeded... it sounds very good.

If you're coming to CanJam, you can listen to it. I think Nate M will also have his version there.

Pete
post #2 of 6812
Ha, Millett Min!

As Pete said I've already built and been using one of these for a while (month or so) for my amp at work. To say that it's a bargain would be an understatement. The build, even for non-ptp folks like myself, is easy and straightforward if you can follow a schematic. Here are a few choice shots of mine, I'll upload a picture with the knob mounted some time soon.






Big thanks to Pete for another great project for both new and old DIY'ers!
post #3 of 6812
Look interesting
How much do its parts cost?
post #4 of 6812
Quote:
Originally Posted by Lil' Knight View Post
Look interesting
How much do its parts cost?
I believe that there's a BOM on Pete's page that includes pricing information. In my build the parts order from Mouser was ~$40 shipped ($11 chassis included) and I think tubes and sockets set me back another $10 shipped. If you have anything in the way of parts laying around (like I do) you can build one of these for under $50 including everything without breaking a sweat.
post #5 of 6812
Ah yes Just see the parts
I wonder where can I get the tubes? And all the other parts can get from Mouser?
Thanks
post #6 of 6812
Quote:
Originally Posted by Lil' Knight View Post
Ah yes Just see the parts
I wonder where can I get the tubes? And all the other parts can get from Mouser?
Thanks
You can find the 19J6 here:

Antique Electronic Supply

They're $1.10 each. Pete is loading us down with those pricey NOS tubes again.

Nice design! Might have to put one of those on my shelf shortly.
post #7 of 6812
Quote:
Originally Posted by Uncle Erik View Post
You can find the 19J6 here:

Antique Electronic Supply

They're $1.10 each. Pete is loading us down with those pricey NOS tubes again.

Nice design! Might have to put one of those on my shelf shortly.
Thanks Uncle I've just taken a look at eBay but couldn't find one
post #8 of 6812
Pete's given us another great one! This thing looks cool - I've already started ordering parts. I had a bit of trouble finding the power supply, but this link should help you guys:

Cisco 34-1977-03 48V 0.38A PSA18U Power Supply NEW - eBay (item 360035479615 end time May-20-08 14:46:30 PDT)

The guy is down to 92 from 100 in the last hour, so they may be going fast!

I'm guessing the ingenious method of loading the MOSFETs with the tube heaters means they're already biased at 150ma. Sounds like a neat trick all the way around.
post #9 of 6812
Think this is a good beginner project?
post #10 of 6812
Wow, thats an awesome budget project. Thanks again for your continued commitment to the diy community.
post #11 of 6812
Quote:
Originally Posted by n_maher View Post
I believe that there's a BOM on Pete's page that includes pricing information. In my build the parts order from Mouser was ~$40 shipped ($11 chassis included) and I think tubes and sockets set me back another $10 shipped. If you have anything in the way of parts laying around (like I do) you can build one of these for under $50 including everything without breaking a sweat.
What chastise did you use? I don't have any metal boxes lying around...
post #12 of 6812
Quote:
Originally Posted by malldian View Post
Think this is a good beginner project?
Reasonably good, yes. You do have to be prepared to do some thinking on your own as there aren't step by step instructions and the layout is entirely up to you. But it's safe enough (48VDC, no exposure to 120VAC) and doesn't require that many parts and there will be folks around here who can help if you have trouble.
post #13 of 6812
I think I am going to try it... just bought the power cord!
post #14 of 6812
Quote:
Originally Posted by malldian View Post
What chastise did you use? I don't have any metal boxes lying around...
It's a Hammond Steel enclosure - Mouser part no: 546-1441-12BK3 but I'd encourage you to try something different. There's really no limit to what you can use.
post #15 of 6812
I am wondering about what size to use for the enclosure... I guess the smaller it is the harder to do.
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