Show your headphone amplifier

Discussion in 'Headphones' started by boza, Aug 15, 2017.

  1. Judas Priest

    Judas Priest Super Member

    Messages:
    2,248
    Location:
    Germany
    I really wouldn´t know how to do a whole thread about assembling the kit. It´s just installing the proper components in the right place and soldering them in :)

    And hoping it works :)

    Anyway, I bought it from headnhifi.com for €70 plus €7 shipping. I was glad to find a supplier here in Germany. They also offer the O2 fully assembled for €110.
     
    Last edited: Jan 28, 2018
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  2. Delta77

    Delta77 Active Member

    Messages:
    207
    Location:
    Central California
    Here is what I chose to dive into the headphone game with..!!
    ZMF (Auteur-teakwood)
    They just came in (2) days ago, hooked up directly to the OPPO 205 ,,
    DECWARE csp3, coming soon to drive them..!!
    5CB397A2-74FB-4051-8989-971DDEB16F39.jpeg
    BBAAEAFD-4138-4AD1-BCE4-83F5B0F6B7EB.jpeg
    97C612FB-9C2B-47CF-9218-202278964E23.jpeg
    57D33413-93FA-472A-9B4F-F2086B9E13E7.jpeg
    FEBD01A6-0D69-4DB0-A786-8B037DDA5687.jpeg
     
  3. boza

    boza Super Member

    Messages:
    1,502
    Location:
    uk
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  4. EngineerNate

    EngineerNate AK Subscriber Subscriber

    Messages:
    2,469
    DIY Pete Millett Starving Student, 12A*7 version running JAN 6829 tubes at the moment. It drives my T50RP mkIII's most excellently. Case is a pet urn (yes, as in to put their ashes into) I found on Amazon. :D

    I believe Panasonic FC power caps, Nichicon Muse ES cathode bypass caps (100% of signal goes through these. Not seen in initial pics, I assembled with cheapies first) and Nichicon KW + Wima MKS2 for output filtering. MKS2 for the other box caps as well. All resistors are Vishay-Dale milspec metal films.

    [​IMG]

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    And finally complete with the new tubes:

    [​IMG]

    Cheers
    Nathan
     
  5. boza

    boza Super Member

    Messages:
    1,502
    Location:
    uk
    Awesome :rockon:
     
  6. lokerola

    lokerola AK Subscriber Subscriber

    Messages:
    966
    Location:
    Alexandria, VA
    Looks great! Nice shielding on the inside of the box.
     

     

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  7. EngineerNate

    EngineerNate AK Subscriber Subscriber

    Messages:
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    Thanks! The shielding is a pain to put in but it keeps it quiet and also acts as a sacrificial later when I need to remove the board. The board is hot snotted to the foil, so if I pull firmly on the back edge of the board I can remove it along with the foil under it, do whatever needs to be done to the board, re-foil and reglue. I tried to mount with screws but the top of the box is only 1/4" thick do there just wasn't enough purchase.

    I got the foil idea from electric guitars and wooden stomp boxes.

    Cheers,
    Nathan
     
  8. CoryS06

    CoryS06 Active Member

    Messages:
    127

    What's the story behind this M8
     
  9. cgoroo

    cgoroo Active Member

    Messages:
    289
    Location:
    England
    the RTR mechanism went kaput. i lacked the knowledge and discipline to restore it back to its intended form so I committed the unforgivable sin of using the amps for another purpose.

    if you're here to shame me about gutting the akai, you'll need to get in line :-D
     
  10. CoryS06

    CoryS06 Active Member

    Messages:
    127
    No I'm not trying to do that at all. That thing is huge yet cool at the same time. Its massive. It gets the job done tho but in an overkill kind of way. Like dropping a bomb on an ant hill. lol
     
  11. Lavane

    Lavane AK Subscriber Subscriber

    Messages:
    7,006
    Location:
    northern cal.
    They make for a nice little single ended tube stereo amp also. If you have sensitive speakers they can get loud. Around 5 watts I think. Those little mono blocks can make for a nice basic guitar amp also. I have a single ended tube amp that is around 6 to 7 wpc and will drive some 84db speakers I have, just not loud. Others I have that are more sensitive 6 watts get pretty loud.
     

     

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  12. stuck limo

    stuck limo Active Member

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  13. judsonw

    judsonw Well-Known Member

    Messages:
    681
    Location:
    Bellingham, WA, USA
    Do you use something to lift the tubes up? My Valhalla 2 has the tubes seated much deeper.
     
  14. stuck limo

    stuck limo Active Member

    Messages:
    177
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  15. Lavane

    Lavane AK Subscriber Subscriber

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    Location:
    northern cal.
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  16. AdamAnt316

    AdamAnt316 Collector of heavy things Subscriber

    Messages:
    2,122
    Location:
    MA
    Currently driving my Sennheiser HD650s with this! :D
    [​IMG]
    Using a headphone interface based on a dewdude design. Here's a schematic:
    [​IMG]
     
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  17. lokerola

    lokerola AK Subscriber Subscriber

    Messages:
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    That bad boy looks like it weighs about 40lbs!
     
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  18. Lavane

    Lavane AK Subscriber Subscriber

    Messages:
    7,006
    Location:
    northern cal.
    Hey I have one of those amps! Thanks for posting the diagram. Might have to try that. What make before break switch did you use?
     
  19. AdamAnt316

    AdamAnt316 Collector of heavy things Subscriber

    Messages:
    2,122
    Location:
    MA
    Close! User manual says 32lbs. The interface box adds a bit of weight, but not by much.
    Not sure off-hand who made the switch I used; I believe it's sold under the "Philmore" brand at my local electronics store (ex-Radio Shack franchisee). Whatever you use, make sure it doesn't have a 'center off' position, or you could potentially leave the tube amp unloaded, which is a Bad Idea™. Just about anything listed here or here should work, methinks.

    Also, make sure the power resistors you use are non-inductive. Radio Shack used to sell 8 ohm 20W non-inductive power resistors, but since they're no longer around (for the most part), you'll have to check Mouser or another supplier to see what they have in that regard. Granted, the NTE-brand 8.2 ohm 25W power resistors I'm using in the headphone interface box I built didn't explicitly say "non-inductive" on the packaging, so maybe it isn't especially critical, but tube amps tend to prefer resistive loads, AFAIK.
    -Adam
     
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  20. Lavane

    Lavane AK Subscriber Subscriber

    Messages:
    7,006
    Location:
    northern cal.
    Thanks! I do at leased know not to run my tube amps without a load attached. Thanks for the info about the resistors! I really do miss the shack when you need bits like these.
     

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