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Thread: 6sl7 phase inverter gain stage

  1. #1
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    6sl7 phase inverter gain stage

    I have a couple of chassis' that would work well as 5E3s. I would like to substitute 6SL7 ( I've got a few of these and the chassis has an octal socket) for the standard 12ax7 in the middle position. Half gain, half phase inverter. Does any one know how this would be accomplished? i mean what resistor values would work? if you can point me in the right direction or know of an existing schematic that uses this scheme, that would be great. Also, is there any reason not to pursue this idea?

    Thanks, as always.

  2. #2
    Senior Member Sir Cuitous's Avatar
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    Just my input here before our forum experts chime in. The 6SL7 is a dual triode. Wire up the octal socket for the 6SL7 and plug it in. I believe this tube can run in many of the same circuits as the 12AX7. It should work with no other changes to the circuit.
    "The time I burned my guitar it was like a sacrifice. You sacrifice the things you love. I love my guitar."
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  3. #3
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    That sure would make it easy. I know it is a dual triode, that 's why a wanted to use it. And it is my understanding that it similar to the 12ax7 with less gain. Can the same resistor values be substituted from one tube to the other?

    Anyone?

    Thanks

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    Check out this drawing....


  5. #5
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    Good Idea

    I just built a 5C3 Twin from a doner chassis using a 6SL7 in place of the first two stage. After the fact, I ran into a great schematic by Scott Swartz. Just Google him and you'll find his page. This guy also published a tube version of the Univibe in Vacuum Tube Valley magazine. I found it here: http://msswartz.tripod.com/ulgtramp1.htm
    The article is "An Ultralinear Guitar Amplifier". The output in your case could be with your own iron of course. In my 5C3 redeaux, I had to kill a lot of gain in the second stage using the tweed tone controls. The Swartz design has the attenuation built in by using the more current Fender tone stack. It's a cool design.

  6. #6
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    Oops..

    I meant "5C8" above.

  7. #7
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    I've been using 6SL7s for a few years in place of the 12AX7s,in the PI and preamp positions, and recently in a Fender type reverb circuit.

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