Anyone using PA heads for guitar?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by Mike9, Oct 2, 2006.

  1. Mike9

    Mike9 Supporting Member

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    I'm curious I have a couple of Bogen PA heads - 10 watt and a 30 watt. I'd like to convert to guitar, but have never worked on tube amp chassis save retubing and new cabinets. Has anyone converted and modded one of these?
     
  2. hasserl

    hasserl Member

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    Yeah

    [​IMG]

    Also, check out the thread in the Amps board about the Crate Powerblock clips, the Boggy in that thread is a converted Bogen pa amp.
     
  3. Swarty

    Swarty Member

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    I have an old Bell PA amp w/ 2 6V6s that just rips. Also have a Marshall 20w PA that is quite nice too.
     
  4. Mike9

    Mike9 Supporting Member

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    That RCA looks sweet - did you rework the circuit at all?
     
  5. Sparky6string

    Sparky6string Member

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    I've got a Newcomb that Skip Simmons converted and it's got staggering tone with single coils.
    [​IMG]
     
  6. erksin

    erksin Member

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    I recently sold a Masco Audiosphere 8 (single 5Y3/6L6/12AX7) - cool little amp...

    [​IMG]
     
  7. bigolcasino

    bigolcasino Member

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    I've used a PA head on stage for the last 6 years. :AOK

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  8. vibroverbus

    vibroverbus Member

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    I've got a funky little weird old PA amp with one 6L6 and some oddball pre-amp tubes (non 12A-7 types, don't recall which). Like a Bogen but some no-name brand from the 60's. It's kind of cool but needs a heavy going over.

    Some PA amps are fairly different designs on the pre-amp side - that's what usually gets redone. Typically guys will daisy-chain the existing multiple input stages into one or two guitar input stages. Power amp designs seem fairly basic. The Marshall/Simms/etc. type PA amps are very very close to the guitar amps if you look at the schematic which is why they make a great bargain.
     
  9. cameron

    cameron Member

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    I have a solidly build Stromberg-Carlson PA head from the 50s that I bought for $25. I have elaborate schemes to turn it into a killer guitar amp, but haven't yet found the time or energy.

    Typically you have to outfit them with 1/4" jacks for the speakers, and perhaps muck with the tone stack to make them more guitar-friendly (emulate some tweed-era Fender circuit with the same tone-knob configuration and you won't go too far wrong).

    Aside from that just the basics: caps replaced, grounded AC cord, tubes checked etc.
     
  10. teleamp

    teleamp Senior Member

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    I love my Stromberg-Carlson 33, great tone.
     
  11. Leftee

    Leftee Guest

    I've done a lot of work in this area. It can work out really, really well.

    http://www.leftee.net/boggy.htm

    Many of these amps are set up to run clean and they are EQ'd fairly neutral. As we all know, neither of those conditions are conducive for guitar.

    Recently I landed another one which I'm digging a lot. It's a little single-ended monster. Some minor mods to the front end, and she rocks.

    http://www.leftee.net/Pacemaker.htm
     
  12. Leftee

    Leftee Guest

    Richard,

    I haven't seen that amp in a while. I forgot how sweet it is!:AOK
     
  13. hasserl

    hasserl Member

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    Thanks! Yeah, I pretty much gutted it and started over, just using the trannies and sockets. But the original circuit could have been reworked for guitar pretty easy if I wanted to.
     
  14. ahellam

    ahellam Member

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    Got 2 Skip Simmons amps. One Masco fendery guy and one Newcomb voxy guy. Both about 15-18 watts. Amazing tone and vibe from both. Skip is the man.:dude
     
  15. Greentone

    Greentone Member

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    I once saw Duke Robillard play a Strat thur a 6 Channel Peavey head into a no name 2X12 cab!

    I have a 30 watt bogen that I am gonna work over for guitar.
     
  16. dorfmeister

    dorfmeister Member

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  17. gayler

    gayler Member

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    No PA heads, but I like to play through my airline console pluged into the phono input. It's a little louder than my 5F1 but much more clean headroom.
     
  18. MR.K

    MR.K Member

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    I just got a "Precision Electronics Inc." PA head from the early 50's, two 6v6's, 10w. I was looking for an old tube practice amp and stumbled onto this PA head. I'm a Blues guy. This amp kill's, no I mean it. Serious-serious tone very touchy feely. I put a '57 Jensen P12R in an old 50's school auditorium speaker enclosure, it works.
    I've never put a sound bite up but I'm going to work on that, plus pic's
     
  19. soldersucker

    soldersucker Member

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    50 watt AU-57 Stromberg here not modded it has some nice crunch when cranked and love how it looks!
    [​IMG][​IMG][​IMG][​IMG]
     
  20. drbob1

    drbob1 Silver Supporting Member

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    I use a Bell and Howell PA amp, modded only with 1/4" jacks for my Leslie and Vibratone cabs. I have a Bogen PA (early, expanded metal version, 2 6V6s) modded to basically tweed Deluxe circuitry and it works really well. Recently upgraded the OT to MM with a nice bump in sound, but that means there's not a lot of the original circuit left...
     

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