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Red Knob Twin Conversion Done!

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  • Red Knob Twin Conversion Done!

    Hello everyone.

    I just wanted to post this mainly to thank all of those who helped me through the process of converting my Fender Red knob Twin into a hybrid Tweed/Black Face/Red Knob. It turned out great and it sounds good too! I was amazed how quiet it is.

    BEFORE:
    Fender Red Knob Twin 100W



    AFTER:
    Fender Tweed Face 50W



    New amp features:
    Channel One
    -BF Deluxe voiced AB763
    -Added mid control
    -One input (HI)
    -Reverb w/Foot Switch

    Channel Two
    -Tweed Bassman voiced 5F6A
    -Three inputs: Norm,Link,Bright (HI)
    -Presence control is global for both channels

    Power Section and Reverb
    -Reverb circuit components modified to BF values (Reverb only on CH1)
    -FX loop still functions
    -Bassman OT 50W
    -2 6L6's instead of 4
    -Circuit components modified to BF/Tweed values

    I am currently in the process of adding a "Sag" resistor in the B+ rail. Since I had the chassis out of the amp again I thought I would snap the photo of the internals.

    These are the threads I had entered for help:
    Fender Red Knob Twin w/GZ34
    Fender Red Knob Twin -> 5F6A Conversion
    Filter Cap Reduction
    Fender Red Knob Tweed Face
    Help with Biasing my converted amp

    I have been updating the schematic as I go along so I will uploaded it to this thread soon.

    Thanks again everyone!

    Seth

  • #2
    Very cool conversion! Kudos

    Comment


    • #3
      Thanks for the Kudos. It was a great learning experience.

      Comment


      • #4
        As promised here is the schematic as it is now.



        I'm thinking about modifying the 5F6A inputs to just 2 inputs High/Low and adding the second one back onto the AB763 channel. The 2 inputs on the 5F6A channel will be a LOW(single triode) and HIGH(parallel triode) with a single volume instead of normal and bright. I will name the volume as "gain" and put a volume control directly after the 5F6A tone stack instead.
        Attached Files

        Comment


        • #5
          Originally posted by Dagan8 View Post
          As promised here is the schematic as it is now.



          I'm thinking about modifying the 5F6A inputs to just 2 inputs High/Low and adding the second one back onto the AB763 channel. The 2 inputs on the 5F6A channel will be a LOW(single triode) and HIGH(parallel triode) with a single volume instead of normal and bright. I will name the volume as "gain" and put a volume control directly after the 5F6A tone stack instead.
          Hey guys - joined this forum as I really want to do the same conversion on my red knob twin, but the schematics seem to be missing - can anyone else post them up for me please?

          Thank you in advance.

          Phil

          Comment


          • #6
            Originally posted by guitardrdock View Post
            Hey guys - joined this forum as I really want to do the same conversion on my red knob twin, but the schematics seem to be missing - can anyone else post them up for me please?

            Thank you in advance.

            Phil
            Bump

            Comment


            • #7
              See http://bmamps.com/Schematics/fender/the_twin.pdf
              Channel 1 is 'as near as makes (nearly) no difference' to a BF TR reverb channel.
              My band:- http://www.youtube.com/user/RedwingBand

              Comment

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