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Heyboer TO-22 Blues Jr. question.

Discussion in 'Amp Tech Center' started by MrFrenchy, Aug 15, 2015.

  1. MrFrenchy

    MrFrenchy TDPRI Member

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    I've done the Fromel mod with full recap, Billm hi voltage pre-amp mod, presence control mod.
    When I received the Billm TO-22 output transformer the AUX Spkr prewire socket was missing. I'm assuming the the extra yellow wire on the OT is for the auto ohms switching?
    Can it be hooked up like the old one came out and leave the yellow wire unhooked? ( it would be insolated to prevent shorting). Until I receive, or buy a new oitput switch jack.
     
  2. Wally

    Wally Telefied Ad Free Member

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    Did the PT come with a diagram for the primary and secondary?
     
  3. MrFrenchy

    MrFrenchy TDPRI Member

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    No.
     
  4. MrFrenchy

    MrFrenchy TDPRI Member

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    Wires are coloured the same as the original except for the extra yellow wire
     
    Last edited: Aug 16, 2015
  5. mcabe

    mcabe Tele-Meister

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    You probably already figured this out, but the TO-22 has 4 and 8 ohm taps. The stock Blues Jr. transformer only has an 8 ohm tap. I assume the extra wire is the 4 ohm tap for the secondary. You should be able to safely ignore the yellow wire. I would contact billm or allen amps to confirm.

    http://billmaudio.com/wp/?page_id=545
     
  6. MrFrenchy

    MrFrenchy TDPRI Member

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    It is what I did. And all is working. Insulated the yellow wire with some heat-shrink tube.
    Sent Billm an email. With no response. I dont really need the 4ohm tap. I'm done with the mods on this amp, got what i wanted out of it.

    What a huge difference! Very happy!
    ImageUploadedByTDPRI1440646540.097485.jpg
    1999 Blues Junior
    Custom head cab, Fromel mods and recap, Billm high voltage mod, audio tapered master and reverb, presence control, MOD reverb tank, TO22 output tranny, twin mod.
    Jet City 1X12 Cab with Eminence Canabis rex speaker.
     
  7. String Tree

    String Tree Doctor of Teleocity Ad Free Member

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    MrFrenchy

    I LIKE that!

    If it isn't asking too much, may we see some pics of what you did under the hood?
    How did you re-position the Tubes?

    ~ ST
     
  8. mcabe

    mcabe Tele-Meister

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    That is one tricked out Blues Jr! I love the head cab conversion.
     
  9. MrFrenchy

    MrFrenchy TDPRI Member

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    Didn't have to! Chassis is laying horizontal instead of vertical.
     
  10. MrFrenchy

    MrFrenchy TDPRI Member

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    The trick was to make the reverb tank fit in there!
     
  11. String Tree

    String Tree Doctor of Teleocity Ad Free Member

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    Do the Tubes stick out the back?
     
  12. MrFrenchy

    MrFrenchy TDPRI Member

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    Here are the pics of my "Blues Senior"!
    The AXE velcro strap showing is to hold the power cable while in transport.
    ImageUploadedByTDPRI1440730342.015034.jpg
    ImageUploadedByTDPRI1440730376.219183.jpg
    ImageUploadedByTDPRI1440730394.521592.jpg
    ImageUploadedByTDPRI1440730411.208081.jpg
    ImageUploadedByTDPRI1440730440.880078.jpg
     
  13. String Tree

    String Tree Doctor of Teleocity Ad Free Member

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    Thanks for the Pics, I am impressed!

    Did you Solder the AC Leads and forgo the Stock, Detachable Power Inlet/Cord set-up?
     
  14. MrFrenchy

    MrFrenchy TDPRI Member

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    No, on these older model the power cord is permanent.
     
  15. jfromel

    jfromel TDPRI Member

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    If you ever want to use the 4 ohm tap and ditch the fat switch jack here is how you wire it up.

    This is from a Blues Jr that was upgraded to a Mercury Magnetics transformer with the 4 & 8 ohm tap but the wiring should be the same for the TO-22.

    Basically you need two new jacks a switchraft 12a and 13a, clip the the wires for the fat swith close to the main board and resolder the feedback loop as shown. The fat switch will still work fine from the control panel and now you can run two 8 ohm cabs!

    Great looking head conversion, I am jealous!!!

    [​IMG]
     
  16. MrFrenchy

    MrFrenchy TDPRI Member

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    Ok, that seem simple enough!
    Thanks!
     
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