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Building Custom Bass Amp

Discussion in 'Amps [BG]' started by staybobo, Nov 11, 2012.


  1. staybobo

    staybobo

    Oct 6, 2012
    Mercury Magnetics Hiwatt Partridge Transformers: OT HI200-O & PT HI200-P.*
    Preamp tubes: 5751 & 12AY7.
    Driver tubes: 12AX7 & 12AU7.
    Power tubes: 6550.
    Rectifier: Solid State.
    2 Inputs Passive & Active
    Optical 3:1 Compressor/Limiter w/switch.
    Wattage knob to go from 350 watts to 30 watts.
    Master volume per channel.

    Channel 1: 4 band Baxandall Eq. & 9 Band Graphic Eq. *- Clean to Moderate breakup
    Channel 2: Sunn Bass Coliseum Eq.*& 9 Band Graphic Eq. *- Dirty to Fuzzed out
    Effect: Envelope Filter w/Graphic Eq.

    Foot pedal: Channel 1/2, Graphic Eq off/on, & Envelope Filter off/on
    Speaker Cabinet: 1964 Gibson Titan III Speaker Cabinet For Bass.
     
  2. BogeyBass

    BogeyBass

    Sep 14, 2010
    Cool dude that is alot of stuff is this a kit or do you plan on laying that all out yourself.

    Interested in how your doing the pre and EQ's board? turrents?
    350 watts so....6 or 8 power tubes? plate voltage?

    sounds like a monster, going to need healthy bias current and one hell of a phase splitter.

    cant wait to see this.......
     
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  4. BassmanPaul

    BassmanPaul Gold Supporting Member

    Aug 25, 2007
    Toronto Ontario Canada
    Interesting. Have you ever built a tube amp before or designed one???
     
  5. B-string

    B-string Gold Supporting Member

    3 graphic EQ's? Really? One on one channel maybe IHMO. I find graphic EQ's more destructive than useful, but it is not my amp :)
     
  6. JGR

    JGR The "G" is for Gustav

    Jun 29, 2006
    Maryland
    Disclosures:
    President, CEO, CFO, CIO, Chief Engineer, Technician, Janitor - Reiner Amplification
    Go with Heyboer instead of Mercury unless you get a discount on MM.
     
  7. B-string

    B-string Gold Supporting Member

    BTW the output trans you listed is a 200 watt transformer. It won't due 350 watts.
     
  8. B-string

    B-string Gold Supporting Member

    Have you tried http://www.magneticcomponents.net/ ? I just installed one of their OTs in a Marshall 6100. It turned out to be not only a good replacement but a tone improvement as well. Creamy OD, more open lows and sweeter highs.
    A "SVT' or 400/400+ OT would be a special order (300 watt plus) but they do special orders all the time and more reasonable than MM?
     
  9. Bassmec

    Bassmec

    May 9, 2008
    Ipswich UK
    Disclosures:
    Proprietor Springvale Studios
    But then again he didn't say how many 6550 tubes he has in his design
    So we don't know a lot, perhaps it's such much:
    [​IMG]
    but starved plate.:D
     
  10. B-string

    B-string Gold Supporting Member

    My bet is no, but I have been wrong before. ;)
     
  11. staybobo

    staybobo

    Oct 6, 2012
    No I haven't built an amp before.

    Mercury Magnetics Hiwatt Partridge Transformers: OT HI200-O & PT HI200-P & Mosfet
    Preamp tubes: 5751 & 12AY7.
    Driver tubes: 12AX7 & 12AU7.
    Power tubes: 5 6550.
    Rectifier: Solid State.
    2 Inputs Passive & Active
    Optical 3:1 Compressor/Limiter w/switch.
    Wattage knob to go from 200W Tubes/450W Mosfet to 30W
    Master volume per channel.

    Channel 1: Tubes 4 band Baxandall Eq. & Switchable Off/On 9 Band Graphic Eq. Clean to Moderate breakup @ 200w.
    Channel 2: Mosfet Sunn Bass Coliseum Eq. Dirty to Fuzzed out @ 450W.

    Foot pedal: Channel 1/2 & Compressor/Limiter.

    Speaker Cabinet: 1964 Gibson Titan III Speaker Cabinet For Bass.
     
  12. BassmanPaul

    BassmanPaul Gold Supporting Member

    Aug 25, 2007
    Toronto Ontario Canada
    The voltage required by a 350W amp is lethal and needs special measures to be taken. Even after 50+ years of working with tube electronics this is a project I would think more than twice about attempting.
     
  13. BassmanPaul

    BassmanPaul Gold Supporting Member

    Aug 25, 2007
    Toronto Ontario Canada
    Then if you attempt this you are in danger of losing your life!!! I just can't emphasize that enough.
     
  14. JGR

    JGR The "G" is for Gustav

    Jun 29, 2006
    Maryland
    Disclosures:
    President, CEO, CFO, CIO, Chief Engineer, Technician, Janitor - Reiner Amplification
    They do indeed make great stuff; I have used them for guitar as well. I inquired about an SVT style a few years ago and they wouldn't do it. Heyboer are great and very well priced. I've got five custom chassis waiting for a big amp, and the design is done, but as Bassmanpaul said, it's a huge undertaking.

    To the OP, if you haven't built an amp before - make that several - DON'T start with something this complex and dangerous. .
     
  15. staybobo

    staybobo

    Oct 6, 2012
    What style output and power transformer should I use?

    Tube/Mosfet bass amp
    Preamp tubes: 3 5751 & 2 12AY7.
    Driver tubes: 3 12AX7 & 1 12AU7.
    Power tubes: 4 6550.
    Rectifier: Solid State.
    2 Inputs Passive & Active
    Optical 3:1 Compressor/Limiter w/switch.
    Wattage knob to go from 200W Tubes/450W Mosfet to 30W
    Master volume per channel.

    Channel 1: Tubes 4 band Baxandall Eq. Clean to Moderate breakup @ 200w.
    Channel 2: Mosfet Sunn Bass Coliseum Eq. Dirty to Fuzzed out @ 450W.

    Foot pedal: Channel 1/2 & Compressor/Limiter.

    Speaker Cabinet: 1964 Gibson Titan III Speaker Cabinet For Bass.
     



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