Filled out new organ donor card today...what to build?

Discussion in 'Shock Brother's DIY Amps' started by RollingBender, Apr 22, 2019.

  1. RollingBender

    RollingBender Tele-Holic Vendor Member

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    Annual spring clean-up in my town this weekend. Scored this little gem...
    90BF892B-5898-4033-9026-610988A58B9A.jpeg 24907B2F-F1BB-49ED-A41E-CB9AFCAB949A.jpeg
    EZ81 rectifier, 2-EL84 power tubes, and a pair of 12AU7’s. Looks like a good start to a guitar amp to me!

    What would you build?
     
  2. symbiotic

    symbiotic TDPRI Member

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    One possibility would be something like a 18-watt Lite IIb, as you already have the perfect tube complement (swapping 12AX7's for the 12AU7's of course). You could build it straight-ahead, or you could mess with splitting the cathodes on the parallel input stage and voice the two triodes differently. Something I've been considering trying.

    Here is a discussion of parallel triode input stage on the Ampgarage forum:
    https://ampgarage.com/forum/viewtopic.php?f=6&t=11146

    BTW, congrats on the find and have fun!
     
    Last edited: Apr 22, 2019
  3. RollingBender

    RollingBender Tele-Holic Vendor Member

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    What do you think of a 18 watt Marshall power amp with RobRob’s micro Bassman layout in the front? With a 12AX7 in V1, it would be a “JTM18”!
     
  4. Snfoilhat

    Snfoilhat Tele-Holic

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    Mr Ridesglide likes this.
  5. Mr Ridesglide

    Mr Ridesglide Tele-Afflicted Gold Supporter

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    Stout looking Transformers. Would be helpful to know what the outputs are. As folks said above those 18W Marshall circuits are awesome.
    Personally I like the 15 W Matchless type sonics better. Ceriatone has layouts for 2 or three amps with 15W amps. Creme Brûlée is sweet - EF86 preamp. Lightning is 15W i think, but you'd need to drill another socket for one more preamp tube. Then there's the Spitfire clone -
    All those want to see about about 340 or slightly less on the plates of the EL84's if I remember correctly. Great sounding and versatile amps. The Creme Brûlée is a personal favorite of mine - I made one out of a Hammond organ a few years back - learned more than I bargained for, but got a terrific amp out of it. Don't let the 15W label worry you any - I gigged it a few times in a medium sized room and it kept up fine with a 5 piece band. I ran it through a 2-12 Cab.
     
  6. muswell_hillbilly

    muswell_hillbilly Tele-Meister

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  7. Mr Ridesglide

    Mr Ridesglide Tele-Afflicted Gold Supporter

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    Fantastic find muswell-hillbilly.
    Page 23 looks like the schematic. So the power transformer will put out a near perfect voltage for lots of amps. 8 ohms on the OT. Heater taps too.
     
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