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Thread: Mesa boogie recto preamp tube placement values

  1. #1
    Junior Member gotarock69's Avatar
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    Question Mesa boogie recto preamp tube placement values

    Could someone please tell me the sequence and value(job) for the six 12ax7.And if I could get a cleaner clean sound by going w/ an 12at7? thanks alot


    JJ

  2. #2
    Old Timer defaced's Avatar
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    There are only five preamp tubes in the standard recto series of amps, not six. If you have a rectoverb or tremoverb, there may be six tube, I've never opened one up to know. So if this all doesn't apply, you'll need to be more specific about your amp.

    Starting nearest to the input and moving toward the power transformer you have:
    V1 Preamp
    V2 Preamp
    V3 Preamp
    V4 FX Loop
    V5 Phase Inverter
    On page 4 there's a functional diagram of the amp which will tell you which triode of each tube does what. http://schematicheaven.com/boogieamp..._solo_head.pdf

    The clean sound on the rectos is regarded as being pretty bad. You can try an AT7, but I don't think it will clean it up the way you want it to. You'll get less gain, but it'll still be dark and kinda dull. I'd change V1 to an AT7 for the most prevelant results, or V2 for minor results. Both changes will effect your gain channels though.
    -Mike

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    Junior Member gotarock69's Avatar
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    what I have is the rackmount preamp it has 6 tubes 2 rows of three.hopefully somebody knows.I keep trying different tubes just wish I knew what the properties were thanks

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    Old Timer defaced's Avatar
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    -Mike

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    Junior Member gotarock69's Avatar
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    Thank you

    Thats exactly what I needed thanks alot for your help

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