Old Soul

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Zen Mod

Zen Mod

Official Court Jester
Paid Member
2003-01-27 3:10 pm
ancient Batsch , behind Iron Curtain
www.zenmod.in.rs
  • #546
    I know that Pras had ( maybe still have them) those big Ge Papa did show around min 4

    Though, according to datasheets, 2N1099 are superior in temperature domain and maybe even power wise, so I didn't pull that trigger

    dunno , still question mark, is that comparison truthful or not, only real tests can show ........ anyway - small stash of 2N1099 I have, snatched in few different ocassions, did show that each of them is trouble free

    but, as experience did show - with all these old ones - in first time you must deal with them as they are TNT, ready to blow every second

    Tangerine_Dream_-_Sorcerer.jpg
     
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    Dennis Hui

    Member
    Paid Member
    2002-08-27 7:19 pm
    Toronto, Canada
  • #548
    Just a quick update. I consider my Old Soul to be complete as it sounded lovely as is. It's very quiet, quite cool running, and the only the hiccup I had was my bad luck with some 2n1099 devices. To me, it's an amp well worth building and I hope others will try it.

    Thank you Mighty ZM for sharing this with us.

    My next amp project will be something larger (5U/500) and hotter running. Unfortunately with some stuff happening here I likely won't be able to start till May...

    Cheers,
    Dennis
     
    D

    Dennis Hui

    Member
    Paid Member
    2002-08-27 7:19 pm
    Toronto, Canada
  • #551
    Sounds like wonderful idea. Are you trying to tempt us now. :D:D:D
    flocchini said:
    Congratulations Dennis !!!! glad all worked out - looking forward to your next build :)
    Hopefully mine will be up and running soon - "case" work takes forever for me
    Click to expand...
    Thanks Bob.

    I can't wait to see what wonderful woodwork you will do for your case.

    Cheers,
    Dennis
     
    chede

    chede

    Member
    Paid Member
    2016-01-09 8:59 pm
    In the Düsseldorf suburbs
  • #555
    Zen Mod said:
    shall we try DEF stage with Toob and Mosfet now?

    :devilr:
    Click to expand...

    I'm game !
    :D

    No, really !
    Let's see, an EL84 needs about -10V of bias ... if I take the SissySIT R.3 biasing method, at 30 mA from the current source, we are looking at a level shifter resistor of 330R, with a dissipation of 300 mW ... s, a 1W or 2W resistor should be fine ...
    We would need an output transformer ... would a P-P transformer work, or would you need an SE transformer ... bias currents can be made to cancel, but what about signal current ?

    ... or am I too fast ? :geek:

    Regards, Claas
     
    twitchie

    twitchie

    Member
    Paid Member
    2004-07-12 5:08 am
    Toronto
  • #557
    Dennis Hui said:
    Just a quick update. I consider my Old Soul to be complete as it sounded lovely as is. It's very quiet, quite cool running, and the only the hiccup I had was my bad luck with some 2n1099 devices. To me, it's an amp well worth building and I hope others will try it.

    Thank you Mighty ZM for sharing this with us.

    My next amp project will be something larger (5U/500) and hotter running. Unfortunately with some stuff happening here I likely won't be able to start till May...

    Cheers,
    Dennis
    Click to expand...

    Congratulations on crossing the finish line Dennis! I hope you will have many chances to enjoy Old Soul while you wait for May to come around.

    DEF + Tubes + Mosfet?? This greenhorn cannot resist :)
     
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