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Millett "Starving Student" hybrid amp

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  1. pmillett Contributor
    Quote:

    Originally Posted by holland /img/forum/go_quote.gif
    Hmm, that's a switcher. They do have a linear @ 0.5 for $11.00, but it's not regulated (if it matters at all).



    I'll buy one of the linear unregulated ones and try it out. If it doesn't have too much ripple it might be better than the Cisco power supply, which hiccups a few times starting up.

    Quote:

    Originally Posted by holland /img/forum/go_quote.gif
    True. Keep in mind, if the total goes over $17 or $18 (including shipping), it's probably cheaper to get the Jameco linear.

    Jameco Electronics Power Supplies & Wall Adapters: JAMECO RELIAPRO: MW48-4800500
    Jameco Electronics Power Supplies & Wall Adapters: JAMECO RELIAPRO: MW48-4800500-R

    Is the Cisco one regulated? If it is, then it's a total bargain.




    The Cisco supply is a regulated switcher.

    Pete
     
  2. MusicallySilent
    Ill probably consider this or a mini3 (high or low depends on headphones) over the summer as a amp build once i get headphones, depends if my headphones have better synergy with SS or Tube
     
  3. sejarzo
    Quote:

    Originally Posted by holland /img/forum/go_quote.gif
    Hmm, that's a switcher. They do have a linear @ 0.5 for $11.00, but it's not regulated (if it matters at all).



    I posted that one from Jameco as the Cisco is also a switcher, and the Jameco would likely have enough oomph to drive that potental balanced variant (I think?)
     
  4. n_maher Contributor
    Come on, if you're going to do a balanced version you have to at least consider a tube rectified PS.[​IMG][​IMG]
     
  5. pmillett Contributor
    Quote:

    Originally Posted by n_maher /img/forum/go_quote.gif
    Come on, if you're going to do a balanced version you have to at least consider a tube rectified PS.[​IMG][​IMG]



    Tungars are nice for low voltages. You just have to replace them every 1000 hours or so.

    [​IMG]
     
  6. bhjazz Contributor
    Quote:

    Originally Posted by pmillett /img/forum/go_quote.gif
    I'll buy one of the linear unregulated ones and try it out. If it doesn't have too much ripple it might be better than the Cisco power supply, which hiccups a few times starting up.
    Pete




    Quote:

    Originally Posted by sejarzo /img/forum/go_quote.gif
    I posted that one from Jameco as the Cisco is also a switcher



    I've had good luck with Jameco-branded transfomers. Pretty tough little monsters, they are.

    So would the Jameco switcher be a good replacement? Pete, did you get a chance to check one out?
     
  7. amphead
    Quote:

    Tungars are nice for low voltages. You just have to replace them every 1000 hours or so.



    I use those to light my driveway. [​IMG]
     
  8. holland
    .
     
  9. malldian
    Ok I am not really sure about what I am reading here - can I make the amp as I with out worrying about busting my headphones if I turn it off by accident with them plugged in?
     
  10. pmillett Contributor
    Quote:

    Originally Posted by malldian /img/forum/go_quote.gif
    Ok I am not really sure about what I am reading here - can I make the amp as I with out worrying about busting my headphones if I turn it off by accident with them plugged in?



    This amp is no different than any other amp with an output cap (like the original Millett hybrid design, or any number of others).

    Has anybody blown up their headphones with a Millett hybrid (sans delay circuit)? Build errors don't count [​IMG]

    Yes, it makes a thump when you turn it on or off.

    I have yet to fry any headphones this way, but I can't gurantee there aren't some particulary sensitive headphones that wouldn't like it.

    By the way, on first look the simple delay circuit used on the Millett Max should work fine here. As-is, the first transistor (QM1) might get warm enough to ned a heatsink. You could also change the zener (DM1) to 24V and use a 24V relay to lower the heat.

    Pete
     
  11. malldian
    Alright thanks a lot.
     
  12. Gross
    Antique Electronic Supply is all out of the 19J6 tubes, and I just bought the last 4 from tubedepot.com for 3.95 a peice.
     
  13. malldian
    Whats the shipping time from Antique Electronic Supply?
     
  14. Gross
    Vacuumtubes.net is half the price of tubedepot.com. oh well.
     
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