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  1. Old Comment

    Sapphire 4 headphone amplifier [Rev. 4.1m]

    Fair enough! I have found BC550/560 to sound nice, so may add some BC327/337 to my next order to give them a try as well.
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    Posted Yesterday at 01:09 AM by needtubes needtubes is offline
  2. Old Comment
    rjm's Avatar

    Sapphire 4 headphone amplifier [Rev. 4.1m]

    I started by tabling up all possible devices, then shortlisted to those which were commonly available and further limited the list to transistors where the datasheet included audio as an application. High voltage types not needed so those were dropped. I'm pretty sure I ended up with a final selection which included the BC327/337, BC550/560, and BC547/557 and as you know there is not much to choose between them. Someone here at diyaudio recommended the 327/337 to me as being a good sounding transistor ... so I went with that!
    permalink
    Posted 24th April 2017 at 11:39 PM by rjm rjm is online now
    Updated 24th April 2017 at 11:42 PM by rjm
  3. Old Comment

    Now For Something Completely Different - In a Neat Little Box!

    This is so fffffabulous ! I love the look of the whole thing and the execution is brilliant too.. jealous jealous !!
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    Posted 24th April 2017 at 02:30 PM by kasey197 kasey197 is offline
  4. Old Comment

    Sapphire 4 headphone amplifier [Rev. 4.1m]

    Looks like a nice amp! I am always curious about parts selection, so is there a reason for choosing BC327/337 over BC550/560 or BC547/557? It looks like they may be a little more robust than the 547/557. Are they a type of "double-die" part?
    permalink
    Posted 24th April 2017 at 12:41 PM by needtubes needtubes is offline
    Updated 24th April 2017 at 01:10 PM by needtubes
  5. Old Comment

    Now For Something Completely Different - In a Neat Little Box!

    Ha and you need to add to that the 200 off 0805 smd emitter resistors and 200 off 0805 base resistors!

    Yet another reason this is bonkers
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    Posted 24th April 2017 at 12:45 AM by googlyone googlyone is offline
  6. Old Comment
    rjm's Avatar

    Now For Something Completely Different - In a Neat Little Box!

    That is amazing. Soldering 200 TO-92 transistors though. I think I would blow a fuse before hitting 50.
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    Posted 24th April 2017 at 12:41 AM by rjm rjm is online now
  7. Old Comment
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    Posted 22nd April 2017 at 09:36 PM by mrkramer mrkramer is offline
  8. Old Comment

    Sony VFET version 2 AL Boards Build Blog

    Would be interested in a set of these boards if available. THanks.
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    Posted 21st April 2017 at 04:09 AM by YCLee YCLee is offline
  9. Old Comment

    Sony VFET version 2 AL Boards Build Blog

    I'm interested in a set of boards if/when available. Please LMK.
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    Posted 19th April 2017 at 01:47 PM by Berd Berd is offline
  10. Old Comment
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    Posted 19th April 2017 at 06:03 AM by jlithen jlithen is offline
  11. Old Comment

    Hafler 9505 power supply capacitors for sale. IMPOSSIBLE to find!!!

    Digi-key p/n: 338-1990-ND; under $20. Maybe not exact drop-in, but not $100 either
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    Posted 14th April 2017 at 06:09 PM by BrianL BrianL is offline
  12. Old Comment
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    Posted 14th April 2017 at 10:55 AM by wmeyer wmeyer is offline
  13. Old Comment
    jan.didden's Avatar

    Hafler 9505 power supply capacitors for sale. IMPOSSIBLE to find!!!

    If you are selling high voltage capacitors it might be a good idea to mention the capacitance and the voltage spec ....
    permalink
    Posted 13th April 2017 at 02:40 PM by jan.didden jan.didden is offline
  14. Old Comment
    gkh's Avatar

    iNuke received!

    On most XLRs you can find pin numbers from 1 to 3, usually on the solder side.
    For asymmetric connection, bridge pins 1 and 3 and connect them to the screen of your cable; pin 2 is "hot", and connected to the core.
    permalink
    Posted 11th April 2017 at 05:50 AM by gkh gkh is offline
  15. Old Comment
    SyncTronX's Avatar

    HP 339A Mods & Upgrades

    Everyman, you are most welcome.

    Cheers,
    permalink
    Posted 10th April 2017 at 06:36 AM by SyncTronX SyncTronX is offline
  16. Old Comment
    abraxalito's Avatar

    SAA7220 filter replacement project

    I'm fairly sure (although I've not listened to a TDA1541A) that NOS sounds best but probably the reduction in power supply noise will give some SQ advantage to 4X OS with the ARM CPU.
    permalink
    Posted 9th April 2017 at 10:03 AM by abraxalito abraxalito is offline
  17. Old Comment

    SAA7220 filter replacement project

    I'm interested and I think a lot of TDA1541A chip lovers will also be interested if it will improve the sound.
    No problems if it takes time and you have other things to do.
    permalink
    Posted 7th April 2017 at 03:19 AM by ekidnah09 ekidnah09 is offline
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