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How do I mod my Pro Jr to Sound like a Pro Jr III?

Discussion in 'Amp Central Station' started by Inuitdream, Sep 12, 2010.

  1. Inuitdream

    Inuitdream TDPRI Member

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    Anyone saw the Youtube videos of the new Hot-rodded Pro Jr called the Pro Jr III?.... It overdrives much quicker and compresses great...

    Any ideas on how this can be done?


    Much obliged!
     
  2. Monster Mike Welch

    Monster Mike Welch Tele-Meister

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    It shouldn't sound different, should it? On the Fender website, it just mentions convenience and cosmetic upgrades, and nothing that should affect the sound.
     
  3. rainedave

    rainedave Tele-Holic

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    I don't know about the Pro Jr. III, but here's BillM's look at the changes in the Blues Jr. III:

    http://billmaudio.com/wp/?page_id=709

    Maybe they did similar things to the PJ, too.
     
  4. Webfoot

    Webfoot Tele-Holic

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    Can you provide the youtube link you are talking about?
     
  5. Inuitdream

    Inuitdream TDPRI Member

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  6. Hoodster

    Hoodster Friend of Leo's

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    It doesn't say what the volume is set at, so how do you know it's od'ing earlier than the old version?

    Whatever the case, my "old" PJ sounds better than that clip.
     
  7. TexGoneNW

    TexGoneNW Tele-Afflicted

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    I don't hear much difference.

    Are you sure that this isn't simply the third run of the amp? There have been minor tweaks throughout the history of the PJ, and changes in country manufactured, but I can't hear much difference...same ol' PJ grind.

    You can use different preamp tunes to get the "mild to wild" circuit to either hang in a little longer or break up sooner.
     
  8. Billm

    Billm RIP

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    Prior to this one, the PJ has had six circuit board revisions. Some have had high-frequency input attenuators, different amounts of power supply filtering, conjunctive filters on the output transformer.... yet PJ owners generally feel that they sound pretty much alike.
     
  9. TexGoneNW

    TexGoneNW Tele-Afflicted

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    You know, Billm, I wasn't aware of that. Do you know what revisions occurred when?
     
  10. Billm

    Billm RIP

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  11. s360guitarist

    s360guitarist Tele-Meister

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    The folks at Fender just need to fix the hiss/hum coming out of it. I keep beating this horse and it is long since dead. Wanted to keep my old USA PJ but dumped the noise.

    Gonna try out the PJ III...and fearfully listen.
     
  12. Billm

    Billm RIP

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    My latest finding is that LEDs instead of cathode resistors on the preamp will quiet a PJ's hum. I think it works better than the filament offset voltage, and there's no strain on the tubes. Some hiss is inevitable, but metal film plate resistors helps somewhat.

    If my Blues Junior activity ever slacks off, maybe I'll have time to develop a kit with the right values.
     
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