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Millett "Starving Student" hybrid amp

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  1. Beftus


    Quote:

    I don't know where you do your shopping but those prices are very high. A simple DPDT switch at my supplier is only €0.75 (~USD 0.95).
     
  2. Ikarios


    Quote:

    Mouser's cheapest DPDT switches are ~$2.50, from what I can find. Switches from tubesandmore were ~$8, too. I was also looking at metal film resistors, which are like $2 for the 2W versions. I did find power resistors which are maybe 20 cents. It actually doesn't matter, because I discovered that we have lots and lots of switches at work, so I borrowed a few. Regardless, I really like the idea of being able to fade the tube LEDs. Now that I think about it, though, I may not have enough room on the panels of the case; it's a lot smaller than I thought. I'll have to rethink this whole thing...
     
    Also, it appears that the DC jack sourced at mouser is OOS until August (http://www.mouser.com/Search/ProductDetail.aspx?R=163-4025virtualkey11180000virtualkey163-4025). I looked for a replacement but couldn't find one with the right jack sizing. Does anyone have a spare lying around that they would sell/donate to me? [​IMG]
     
  3. islubio
    Are these boards available anywhere?
    checked out beezar and seems like they are sold out 
    would love to build this as my first amp
     
  4. Beftus
    Quote:
    No more boards. The Starving Student became victim of its own success. The supply of cheap 19J6 tubes has dried up. They're now very difficult to find and if you do prepare to pay a premium price. So far the bad news.
     
    The good news is that you can still make a Starving Student with other tube types. There's the 12SR7, the 12AU7 and the 17EW8 modifications. There's no PCB for these mods though. You'll have to do a point-to-point or make your own PCB. I have made the 12AU7 mod and it sounds awesome. Schematic is here. Good luck!
     
  5. Ikarios
    Anyone know if I can use a 1A/250VDC rated DC power jack as opposed to the spec'ed 2A/100VDC jack?
     
    http://www.mouser.com/ProductDetail/Kobiconn/163-2325-E/?qs=sGAEpiMZZMu2f9RNbWupYlhRViv1JeBB6A17xm18uDs%3d
     
    The one in the BOM is backordered until August 6th and I plan on buying all my crap Friday this week. The PSU is only rated for 0.38A, I just have to not use a different PSU, right?
     
  6. nullstring
    lol, I am sure the original part was chosen pretty arbitrarily. (or for cheapest price)
     
    If it's rated for more than 48V and .38 amps.. I think you're good.
     
  7. the_equalizer
    As nullstring mentioned, I'd say you're safe using that part. You could even use the 1A PSU if you so wish it, since the amp's current draw won't go near 1A during operation.
     
    cheers!
     
  8. Beftus
    A question about the 12AU7 mod. The optional caps C7 and C8 are listed as 220uF 16V. I measured the voltage across those caps in my build and there's only 1.12 and 1.14 volt across them. Why are they specified as 16V? Do they get to handle more than what I measure? Or was their voltage rating chosen arbitrarily?
     
    Edit: Please ignore question. Found the answer here. Gotta learn to use the forum search... [​IMG]
     
  9. swedishhatfaction
     


    Quote:


     
     
    Wow darkraver -- that's a pretty snazzy exterior you got going on there. It kinda reminds me of the crazy abstract art my sister paints. Also, congratulations on having it work the first time. I was not nearly as lucky/skilled and ended up rebuilding mine from scratch.
     
    Edit: Whoops. Didn't realize that post was 10 pages back.


     
  10. baka1969 Contributor
    Hi,

    Will the SSHT properly drive low impedance headphones like the 25 ohm or 8 ohm Beyer DT48?

    Thanks,

    Ross
     
  11. baka1969 Contributor
    Hi,

    Will the SSHT properly drive low impedance headphones like the 25 ohm and 8 ohm Beyer DT48?

    Thanks,

    Ross
     
  12. WC Annihilus
    Curious, does anyone know how this would pair with the DT990/600?  I'm considering trying to build one as a relatively cheap summer project to burn time and get an intro to amps as well.  Other option I've been looking into is the CK2III.
     
  13. nullstring
    I just got a PM about that today.
     
    This was my response.
    Quote:
     
  14. the_equalizer

     
    Quote:

    The output stage has enough muscle, so I think it'd do perfectly with the 8 ohms cans. Though the lowest impedance I've tried with the amp has been some 16 ohm earbuds; it had no problems with them.
     
    cheers!
     
  15. hellomoto
    Hello!
     
    I'm now finished with my build, the tubes are glowing, but I still haven't put my heaphones on it: I found a really nice post from the_equalizer about testing your amp, so It doesn't destroy your whole setup [​IMG]
     
    Here it is: http://www.head-fi.org/forum/thread/319231/millett-starving-student-hybrid-amp/3870#post_6032606
     
    I've got some questions about it, more precisely about the different voltage test:
    - How do you measure the voltage at the tube filaments
    - How do you measure the voltage in the Output Jack? Do you plug in a Mini to Mini, and measure at the other side?
    - How do you measure the voltage in the Jack Plug?
     
    Thank you very much, I'll post some pics!
     
    Antoine
     
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