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Tube pre, not much gain, ideas?

Discussion in 'Pro Audio Equipment' started by took-the-red-pill, May 7, 2005.

  1. took-the-red-pill

    took-the-red-pill Active Member

    Hi guys,

    For you electronics wizzes out there, i'll try to give you the reader's digest version, for the rest of you, this will be a VERY boring post:

    I bought an old tube pre at a garage sale for $5 (altec Lansing 1567A, hand wired, all tube, decades old)

    I had it converted to 4 into 4. I have 2 of the original mic transformers("Peerless 4722," 38/150:50K)

    the signal is nice and rich, but pretty weak.

    The other 2 channels are awaiting my transformer purchase.

    I'm wondering if I can get 'hotter' transformers for the other 2 channels, to get more gain, or will it just bring up the noise floor with it?

    Of the 3 numbers given, which one(s) would I be looking to change to get more gain?

  2. Sebatron

    Sebatron Well-Known Member

    I had a quick look at the 1567A diagram.Looks like one half of a dual-triode is allocated to each channel.
    Changing the transformer will only get you so much more gain.
    Is V3 being utilized?

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