ELP Tube Preamp suggestions (Dodd vs. Dared)

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Comments

  • RuSsMaN
    RuSsMaN Posts: 17,987
    edited November 2005
    Some vintage tubes 'flash' on startup. I had never seen it until just the other day. Apparently, nothing to worry about.
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
  • BlueMDPicker
    BlueMDPicker Posts: 7,569
    edited November 2005
    What's the function of Recitifier tube in preamp?
    Does changing it to a better one will affect the SQ?

    A rectifier utilized in the power supply of a preamp is solely to convert AC into DC - hence the name "rectifier."

    The signal never actually passes through this part of the circuit, so one would think that a rectifier tube has no direct effect on the SQ…well, that's the theory. The truth however is a little bit different. The rectifier tube has a direct bearing on the power supplied for the other tubes and, due to its relative inefficiency (compared to a solid-state rectifier), it can and will “sag” when the demand for power is higher than it can handle. This is a relatively rare case scenario in audio gear unless overdriven.

    However, in guitar amps, a lot of players (me included) like the sound and feel that results from this "sag." ;)
  • fredv
    fredv Posts: 923
    edited November 2005
    One question when I turn ON the preamp THERE IS GLOW OF LIGHT(FIRE) IN THE PREAMP TUBES (12AT7) FOR A SECOND. Is this normal?
    Yup, my Mallard 12DW7 does the same thing - flash at power on, quite a scene :D

    -fredv-
  • ND13
    ND13 Posts: 7,601
    edited November 2005
    fredv wrote:
    Yup, my Mallard 12DW7 does the same thing - flash at power on, quite a scene :D

    Does it quack also??? ;)

    HTRookie's Mullards have a flash at start up also. They are the only tubes I've ever seen that do that. Kinda cool to be honest :cool: .
    "SOME PEOPLE CALL ME MAURICE,
    CAUSE I SPEAK OF THE POMPITIOUS OF LOVE"
  • organ
    organ Posts: 4,969
    edited November 2005
    A rectifier utilized in the power supply of a preamp is solely to convert AC into DC - hence the name "rectifier."

    The signal never actually passes through this part of the circuit, so one would think that a rectifier tube has no direct effect on the SQ…well, that's the theory. The truth however is a little bit different. The rectifier tube has a direct bearing on the power supplied for the other tubes and, due to its relative inefficiency (compared to a solid-state rectifier), it can and will “sag” when the demand for power is higher than it can handle. This is a relatively rare case scenario in audio gear unless overdriven.

    However, in guitar amps, a lot of players (me included) like the sound and feel that results from this "sag." ;)

    Hey Mike,
    Have you compared the Sovtek and Mullard GZ34 in you guitar amp? If so, what was your result. I can live with Sovtek but the Mullard sounds so much better. Better bass, bloom, etc.