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  • emenasche commented on plpicher's instructable Mod your Fender Pro-Jr!7 months ago
    Mod your Fender Pro-Jr!

    I'm writing again a year later after working on the amp. To reiterate, I found your work here very helpful. I have an early model (Rev B) actually ended up putting a 47k in R6, and then running across it to a three way switch, allowing two resistors (or none) to run in parallel, reducing the resistance to like 22k and somewhere closer to 15k, which seems to work pretty well. I added an .01 bypass cap on the first preamp's cathode, and a switchable BPCap on the second stage for a late boost. (I had 10uF but i'm thinking about changing the value there). I'm playing around with the first coupling cap as well. right now at .022 (which they used on later versions) but may go up to .047. The thing lacks bass, even with other speaker cabs. I also made the NFB switchable, but made it go from st...

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    I'm writing again a year later after working on the amp. To reiterate, I found your work here very helpful. I have an early model (Rev B) actually ended up putting a 47k in R6, and then running across it to a three way switch, allowing two resistors (or none) to run in parallel, reducing the resistance to like 22k and somewhere closer to 15k, which seems to work pretty well. I added an .01 bypass cap on the first preamp's cathode, and a switchable BPCap on the second stage for a late boost. (I had 10uF but i'm thinking about changing the value there). I'm playing around with the first coupling cap as well. right now at .022 (which they used on later versions) but may go up to .047. The thing lacks bass, even with other speaker cabs. I also made the NFB switchable, but made it go from stock to more NFB instead of lee. It's not that I want everything to be clean all the time, but I did want to be able to use this thing with effects without everything getting smeary. But I have a question: that tone stack seems like an oddball to me--at first glance it seems tweedy, but it takes signal from after that little resistor network and connects back to the volume pot in an odd way. I find the tone stack to be kinda weak: it goes from relatively neutral to bright, with almost no way to roll into a deep sound. Not sure I care to change it, but am just curious about the circuit and how it's supposed to work. Another question: why, do you think, did they go with 250k on both pots instead of 1 M or 500k?Wow, didn't mean to write a novel here. Thanks again for your well-written and illustrated work.

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  • emenasche commented on plpicher's instructable Mod your Fender Pro-Jr!1 year ago
    Mod your Fender Pro-Jr!

    Thanks for this. Very clear text and pix.

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