SFPR to BFDR specs

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by jerry55, Jul 29, 2006.

  1. jerry55

    jerry55 Member

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    hi all, i would appreciate any feedback on what i need to change on my sfpr to up the output to deluxe reverb specs...thanks in advance...
     
  2. Blue Strat

    Blue Strat Member

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    You can sneak by with the existing power transformer, but the Output transformer and phase inverter (per OTM) definitely have to be upgraded.

    This is not a job for a novice.
     
  3. brad347

    brad347 Member

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    not a cheap job either!

    And is there room in the chassis?

    And is there a point? ;)
     
  4. Pedro58

    Pedro58 Supporting Member

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    I'm embarrassed. I thought SFPR meant "Silver-Face Pro Reverb." I always forget about the Princeton!
     
  5. Blue Strat

    Blue Strat Member

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    That's ok, I usually forget about the Pro. In this case, Princeton made more sense based on the question:)
     
  6. brad347

    brad347 Member

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    i didn't mean 'why the PI.' I knew about the split-load PI in the princeton. I meant "why mod the amp?"
     
  7. Blue Strat

    Blue Strat Member

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    To have a DR (more clean headroom than a PR) in a smaller package? Interestingly, I'm about to do the same thing to my DR.
     
  8. brad347

    brad347 Member

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    well, i'm just saying that by the time you get the heavier iron and speaker etc. in there it's only going to be slightly lighter (due to reduced cabinet dimensions only) than a DR. And it will cost more than just selling the princeton, gettting a SFDR and modding THAT to blackface specs. It's just not worth the extra trouble and expense to save maybe 5 lbs of weight and a few inches of size to me but that's just me! :)
     
  9. ES350

    ES350 Member

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    To change the output of your amp, you need to sell it and buy a Deluxe Reverb.
     
  10. Blue Strat

    Blue Strat Member

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    All true, but for those with the scientific spirit of adventure....:dude
     
  11. jtg116

    jtg116 Too Many Guitars, Too Little Time

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    Jim of L'il Dawg amps builds a great little 5E3 tweed D'Lux for around $499. He can upgrade that to 25 watts also, although I don't know the cost. Great guy great amp. Hacking up the Princeton is not cost effective(I have a tweeked Princeton worth about 1/3 of what I paid for it) Jims amp is also housed in a small enclosure and is very light.
     
  12. Blue Strat

    Blue Strat Member

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    No hacking involved, and I require reverb. I've already got an Allen Amplification upgrade OT in my PR. The PI mod involves a small handful of resistors and caps. No biggie.
     
  13. jerry55

    jerry55 Member

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    well thanks to everyone for your replys and info...and i do have a 67 BFDR ,a 65 BFPR,a 62 princeton which i will not be hacking up but i have this 73 PR which i was just thinking well why not ...it could always be reversed ...the deluxe is a good 8 to 10 pounds heavier... being 58 with bad knees, back and just chock full of artiritis ...living on the second floor 5 pounds can make a difference ...heck a personal roadie would be better but not cheaper ...thanks again
     
  14. Blue Strat

    Blue Strat Member

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    I would agree if we were talking about a black face amp, but we're talking about mid '70s SF. No holes are required and it's easily reversible.
     
  15. tmac

    tmac Goldmember Gold Supporting Member

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    I modded my SFPR to do some of the things you may be looking for:
    Put in a Merc Mag Deluxe Revrb OT and an Allen upgrade PT that will handle 6L6's if I want; did the power supply mod that everyone does (Stokes mod?); even though I basically rebuilt the amp I did not change the PI configuration as I wanted to keep the trem; put in a new Mojo baffle for a 12" speaker; put in a mid boost (.002 cap in parallel with the treble cap) that is on a pull switch on the treble pot (so no holes in chassis). I have JJ 6V6's in it right now.Very cool gigable amp with more punch in small portable package. Kick in the boost for plenty of tweedish gain. Love it.:AOK
     
  16. Blue Strat

    Blue Strat Member

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    Go Tmac! Go Tmac!

    It's always fun walking into a jam and have people snicker at your "little" amp....until you hit the first chord:)
     
  17. brad347

    brad347 Member

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    That's why I love f***ed up cheap guitars (provided they're set up and at least marginally playable). I'm of the opinion that a good player will get good tone no matter what. Sure I have my cool stuff but every now and then I like to remind myself that I don't need it! :)
     

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