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  • #16
    Edit to above: The above PS toroid is made by Amveco and available at Digikey:
    http://search.digikey.com/scripts/Dk...ame=TE70001-ND

    Hoffman's price is good too considering the relevent info he's provided.

    I had asked Amvveco for a transfomer like this but a "dual duty" type. Like we're used to, but toroid and just for preamps. Dang, how hard can this be?

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    • #17
      All you need is two small toroid transformers back to back. A 120V to 6V and then a 6V to 240V. You use the 6V intermediate winding for your heaters.

      If you buy a bunch of international-type transformers (two independent 120V primaries) that covers you for everything.

      Applying 12V to a 6V winding will just saturate the transformer and burn it out.
      "Enzo, I see that you replied parasitic oscillations. Is that a hypothesis? Or is that your amazing metal band I should check out?"

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      • #18
        Steve,

        I hear you saying that there is just one transformer type required: 120V X 2 Primary and 2 x 6V Secondary. I located that part here: http://cgi.ebay.com/12-12V-25VA-Toro...742.m153.l1262

        I think that putting the 4'th stage as 2 x 120 Volts in SERIES will give yea the revered 220V to really pull the tone through. No-one on Earth makes a single toroid with these secondaries? I guess if EH and Rocktron use wallwarts then maybe we should too. Even though these donuts are 3' round by 1.5' high. Having two in an enclosure is going to take up a LOT of space. Sourcing a suitable stomp box is interesting. I saw a stainless steel tissue box that had a hinged bottom that might work well. It had an oval opening on top.

        One more ?: If the Amveco specs as:
        Parallel Output Voltage @ Current 9 VAC @ 178mA
        Maximum Power 1.6 VA

        How many 12ax7's plates can that support? I am guessing quite a few
        How about a ECLL800 or 6BM8? (single tube: output-PI driver and output tube in one) Now that would be liberating!

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