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    Free tube audio class

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    corndog71

    Posts : 454
    Join date : 2013-03-19
    Location : It can get windy here

    Free tube audio class

    Post by corndog71 on Mon Feb 08, 2016 10:25 pm

    Skip to 11:30 to start. Roger Modjeski speaks for about 90 minutes and gives lots of info.

    If you also want to learn about sand amps then skip ahead to 1:50:30 and watch some hippy named Nelson Pass.


    Doctor Hugocat

    Posts : 89
    Join date : 2015-08-19
    Location : Los Angeles CA

    Re: Free tube audio class

    Post by Doctor Hugocat on Fri Feb 12, 2016 3:42 pm

    Thanks for the link! My viewing for tonight...... study

    Captain Coconut

    Posts : 215
    Join date : 2009-10-13
    Age : 64
    Location : Great White North

    Re: Free tube audio class

    Post by Captain Coconut on Fri Feb 12, 2016 5:01 pm

    I'm going to watch Frasier reruns instead. cheers

    tubes4hifi
    Admin

    Posts : 1292
    Join date : 2008-11-30

    Re: Free tube audio class

    Post by tubes4hifi on Fri Feb 12, 2016 7:02 pm

    it gets really interesting around the 40 minute point when he starts explaining how he gets 40wpc on his RM10 amp which is a P-P EL84 amp
    like the 17wpc ST-35, and he uses very small OPTs.
    My favorite part 43:45 he talks about how Audio Research burns up their tubes - I've been saying that for 20+ years!
    Jim McShane - you'll love the part where he talks about testing tubes 1:08 - 1:17

    Jim McShane

    Posts : 154
    Join date : 2011-10-19
    Location : South Suburban Chicago

    Re: Free tube audio class

    Post by Jim McShane on Mon Feb 15, 2016 6:59 pm

    tubes4hifi wrote:it gets really interesting around the 40 minute point when he starts explaining how he gets 40wpc on his RM10 amp which is a P-P EL84 amp
    like the 17wpc ST-35, and he uses very small OPTs.
    My favorite part 43:45 he talks about how Audio Research burns up their tubes - I've been saying that for 20+ years!
    Jim McShane - you'll love the part where he talks about testing tubes 1:08 - 1:17

    There are some words of wisdom in his presentation, but I'll just say that IMHO some of his test/match ideas are somewhat divorced from reality. Yes, I think many of us know that the Gm varies with plate current - but once we get past that point I don't fully agree with his positions.

    He's certainly a smart guy with lots of experience and credentials, but you have to remember that he's also adopted some philosophies and taken some positions that he wants to advance - which is normal but requires us as listeners to be able to be discriminating.

    I watched it and enjoyed it - and learned a few things too!

    bluemeanies

    Posts : 129
    Join date : 2015-02-09
    Age : 66
    Location : Folsom Pa.

    Re: Free tube audio class

    Post by bluemeanies on Fri Feb 19, 2016 2:33 pm

    Thanks will definitely watch!

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