Let's Build: solid state SLO 100

Discussion in 'Gear & Equipment' started by LiveOVErdrive, Sep 13, 2018.

  1. LiveOVErdrive

    LiveOVErdrive CNC hack

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    I've wanted a SLO since I first got a podxt live as a teenager. And while I'll probably build a proper tube clone at some point, for now I'm kind of obsessed with mini pedalboard amps. So I give you my latest project: a solid state pedalboard SLO 100.

    IMG_20180911_182209.jpg

    There's the box that will hold it. It is 7x4 inches. The control layout is in the paper above it (though I've made some revisions since then).

    The final version will have two footswitches - one to change channels and one to switch the rhythm channel from clean to crunch (like on a peavey).

    I've got the volumes and tone stack across the top. I will likely add a presence and resonance in as well. I've designed the circuit for them - it's just a question of if they will fit into the box.

    There will be an effects loop send and return. I originally was going to have this footswitchable but I decided I'd rather use my second switch for clean/crunch.

    Finally, I'm popping one of those eBay 100w class d amps in there as well. So at the end of the day I'll have a little metal box with a monster high gain tone and a giggable volume.

    IMG_20180911_182228.jpg

    Here are my boards. I designed the circuit with jfets based off the SLO circuit. The boards I plotted out by hand and milled on my cnc machine. They'll be directly soldered to the pots along the top (that's what the big holes are for)

    IMG_20180911_175348.jpg

    Hope it works! I'll update as I build.
     
  2. Shask

    Shask SS.org Regular

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  3. LiveOVErdrive

    LiveOVErdrive CNC hack

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    Looks cool. Based on the description it sounds like they built the od channel and then have true bypass for the "off" state. Bet it works great.
     
  4. mnemonic

    mnemonic Custom User Title

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    Very nice, that should be pretty awesome.

    What sort of circuit are you gonna use for presence/depth? If you’re willing to divulge.

    After seeing that thread about the Amptweaker Depthfinder, which looks to me like it could be a tweaked sonic maximiser (state variable eq filter), I tried out my sonic maximiser clone between a pedal preamp (ISP Theta) and a solidstate power amp (old Matrix). I think it works pretty good to simulate that high end and low end boost you get with tube power amps.
     
  5. narad

    narad SS.org Regular

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    Sounds cool!
     
  6. LiveOVErdrive

    LiveOVErdrive CNC hack

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    It's a pretty neat circuit, actually, and part of me wants to pop it in its own little pedal with a power amp and call it a day. Presence, resonance, volume. Done.

    Basically I built the phase inverter of the SLO (with jfets) and ran a cathode follower buffer off the lower output, then tapped the nfb off that. Insert the 6505+ pres/res controls in that loop and voila! The overall open loop gain of the circuit is about the same as the output stage of the SLO (or any amp with a ltp pi really) so it should be almost perfect.

    Technically you don't need the buffer but it works a lot better if you do have it. In simulation at least. I haven't built it yet.
     
  7. technomancer

    technomancer Gearus Pimptasticus Super Moderator

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    Very cool, looking forward to seeing how this comes out :yesway:
     
  8. Shask

    Shask SS.org Regular

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    That is funny, because I remember when I had a Sonic Maximizer years ago (before everyone hated them), I always thought they did a good job of making a Solid State amp sound more tube. It brought in that bigness. However, it made Tube amps sounds thinner, more like a Solid State amp. It was weird, but maybe the tube depth/presence combined with the Maximizer was just too much scooping.

    I am curious about that Depthfinder circuit also.
     
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  9. mnemonic

    mnemonic Custom User Title

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    Yeah, I tried it with my tube amps for fun, and it’s just not necessary. They’ve already got good bass and treble response.

    It does work well in the loop of my Marshall valvestate also.

    The problem is, a lot of people see something like a sonic maximiser as an always-on kind of thing, but it’s just a tool for when an amp sounds too lo-fi or something.
     
  10. TheWarAgainstTime

    TheWarAgainstTime "TWAT" for short

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    Looks interesting. I'll be keeping up with this!
     
  11. nerdywhale

    nerdywhale SS.org Regular

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    Your ideas are intriguing to me, and I’d like to subscribe to your newsletter!
     
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  12. DudeManBrother

    DudeManBrother Hey...how did everybody get in my room?

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  13. HeHasTheJazzHands

    HeHasTheJazzHands greg rulz ok

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    I've felt a disturbance in the force

    As if millions of boutique tube snobs cried out in terror.

    Can't wait to see this done, though. Looks spiffy.
     
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  14. eaeolian

    eaeolian Pictures of guitars I don't even own anymore! Super Moderator

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    I'll be curious to hear this...
     
  15. Dawn of the Shred

    Dawn of the Shred PRS Guitar Addict

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    Agreed!!
     
  16. steinmetzify

    steinmetzify CHUG & SLUDGE

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    In as well. Good luck!
     
  17. narad

    narad SS.org Regular

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    If 50% of every Soldano thread is spent talking about how the DeYoung transformers are magic, I think this is bastardization to such an extreme that it wouldn't even register as a SLO in anything but thread title. Still, I've heard tube-based SLO pedals that sounded really good, so quite curious how this will turn out. Will it be better than the supercharger pedal, for instance?
     
  18. Edika

    Edika SS.org Regular

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    This seems like a great project so I'm in too.

    Oh and:
    No-time-Toulouse-570x570.jpg
     
  19. Wolfhorsky

    Wolfhorsky Regular idiot

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  20. LiveOVErdrive

    LiveOVErdrive CNC hack

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    Thanks for all the support, my dudes. Gonna try to have it up and running on my bench this weekend.

    Also,
    The original mission in San Luis Obispo was named after St Luis of Toulouse.
     

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