Could this be a tube affect?

schwarcw
schwarcw Posts: 7,341
edited August 2006 in Electronics
I'm enjoying my Sheng Ya CDP beyond words. It's a great sounding CDP. During the last several days I've noticed a high frequency very low "whistle" type noise during certain passages of various music. The sound is very low and does not appear to be consistent. I'm listening in 2 channel through my SDA 2.3's and the "noise" appears almost behind me integrated into the music. I was wondering if I'm hearing some microsonics from the tubes? The Sheng Ya has Telefunken tubes, a 6DJ8 in the output stage and a 12AU7 in the power supply.

Any ideas?
Carl

Post edited by schwarcw on
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  • audiobliss
    audiobliss Posts: 12,518
    edited August 2006
    Send it to me, an' I'll do some 'research'. Free of charge, of course.

    :D
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  • halo
    halo Posts: 5,616
    edited August 2006
    pm sent
    Audio: Polk S15 * Polk S35 * Polk S10 * SVS SB-1000 Pro
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  • schwarcw
    schwarcw Posts: 7,341
    edited August 2006
    Thanks for the offer Michael!:D

    BTW, I don't hear this sound on my SS CDP and I don't have another set of tubes to roll into the Sheng Ya since I just picked this up about a month ago from Halo.

    This may be the motivation to get some different tubes to check out.

    Carl
    Carl

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  • halo
    halo Posts: 5,616
    edited August 2006
    I included the original JAN Phillips 6DJ8 and the Chinese 6N4 (12AU7) - You could try those out, no?
    Audio: Polk S15 * Polk S35 * Polk S10 * SVS SB-1000 Pro
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  • schwarcw
    schwarcw Posts: 7,341
    edited August 2006
    Forgot about those. I must have early stages of Altzheimers:(
    Carl

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  • wingnut4772
    wingnut4772 Posts: 7,519
    edited August 2006
    Boy that must drive you nuts. Hope you figure it out.:confused:
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  • RuSsMaN
    RuSsMaN Posts: 17,986
    edited August 2006
    Microphonic tube(s).
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
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  • HBombToo
    HBombToo Posts: 5,256
    edited August 2006
    I also think its microphonics.

    get your tube rolling on.

    HBomb
    ***WAREMTAE***
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  • mhardy6647
    mhardy6647 Posts: 34,016
    edited August 2006
    Could be oscillation if there's nothing (capacitors) to keep it from happening.

    BTW, it would be an "effect", not an "affect".
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  • HBombToo
    HBombToo Posts: 5,256
    edited August 2006
    mhardy6647 wrote:
    Could be oscillation if there's nothing (capacitors) to keep it from happening.

    BTW, it would be an "effect", not an "affect".


    WOW mhardy has his attack on today. My advice is have a beer.

    HBomb
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  • mhardy6647
    mhardy6647 Posts: 34,016
    edited August 2006
    Yeah, sorry... it is a pet peeve of mine. Sort of an affectation :-)
    I tried to be gentle.
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  • HBombToo
    HBombToo Posts: 5,256
    edited August 2006
    Relax and enjoy! I'll be getting my beer hoist on so I'll tip the first one to ya.

    HBomb
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  • mhardy6647
    mhardy6647 Posts: 34,016
    edited August 2006
    Mrs H & I were gonna whip up some pina coladas this afternoon, but our son (the 18-YO) brought back iced coffees from Dunkin Donuts on his way back from paintballing today. mmmmm.... coffee...
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  • schwarcw
    schwarcw Posts: 7,341
    edited August 2006
    mhardy6647 wrote:
    BTW, it would be an "effect", not an "affect".

    LOL! I was thinking "effect" but I typed "affect" figuring all the bad English around here no one would notice.

    Thanks for the info, I'll flick the tube tonight to see if I can hear a ring. Then I'll roll the stock tube into it to see if it goes away.

    I know Victor's tube had very low hours. I'll see if I can get an exchange on a new one. Those Tele's are expensive.
    Carl

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