10w Sol Clone

Discussion in 'Building the Classics' started by Timbo, Apr 18, 2019.

  1. Timbo

    Timbo Active Member

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    Hi guys, There has been a fair bit of talk about the Soldano SLO around the local guys and all rave about them.
    Not that I NEED a 100w monster.
    So in my travels on the net this came up. [​IMG]
    http://diy-fever.com/amps/5-watt-slo/
    What a beast!!!!
    I quickly contacted my valve supplier and he's got hundreds of EL91s, great.

    As you can see Gary Moore is at the top of the list of my favourites and I was unaware that he played SLO's. [​IMG]


    This one always makes me CRY [​IMG] [​IMG]

    So a tribute the greatest blues guitarist.
    [​IMG]
    Because the EL91 are plentiful I'm going up the output to about 10w, if I'm lucky
    [​IMG]
    The VVR will keep the EL91s happy and the preamp, PI will get the full treatment
    The schematics will be updated as we go along.
     
  2. Timbo

    Timbo Active Member

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    This one always makes me cry

    The clips didn't attach on the first post
     
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  3. Timbo

    Timbo Active Member

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  4. Timbo

    Timbo Active Member

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    A good day in the shed.....
    [​IMG]
     
  5. jensvonbustenskjol

    jensvonbustenskjol Active Member

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    Hi Timbo

    What a great idea :applause:
    Good luck!
     
  6. Timbo

    Timbo Active Member

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    Thanks
    Some progress...
    [​IMG]
    For what it worth I have included the active FX loop as per the SLO schematic.
    The reverb will remain. I'm haven't decided on a spring reverb or a Belton brick.
     
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  7. Timbo

    Timbo Active Member

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    Hi guys, Wiring is just about done.
    [​IMG]
    [​IMG]
    Reverb yet to be added.
    I'm also toying with adding a small choke to the preamp power supply. Thoughts.....
    The relays will be switched via a foot switch only for the moment.
    No "bright caps" added, play with that bit later.
    [​IMG]
    [​IMG]
     
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  8. jensvonbustenskjol

    jensvonbustenskjol Active Member

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    Looking good!
    I'm curious towards your relays. What type are you using?
     
  9. Timbo

    Timbo Active Member

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    I don't think they are anything special, I get them from a local electronics part store.
    I have used them many times before as they are quite when switching.
    they run on 12vdc, so I have wired the heaters on 12.6vdc.
    There is a dropping resistor on the supply that sets the voltage around 12.6 and when all relays are engaged the voltage drops to about 12.4V
    https://www.jaycar.com.au/12v-dpdt-special-pc-mount-relay/p/SY4052

    Guys, We have success [​IMG]

    No problems with startup, just a couple questions.
    The depth control doesn't do a lot [​IMG]
    The original schematic has a 39k resistor in the FB circuit and connected to the 4ohm speaker tap.
    I don't have a 4ohm tap only 8, does the resistor need to be halved??
    It goes from zero to flat out in in a small rotation of the gain/volume controls. Reduce the volume controls to 500k?

    I post voltage after I roll some more EL91 to get a closer matched quad. [​IMG]
     
    jensvonbustenskjol likes this.
  10. jensvonbustenskjol

    jensvonbustenskjol Active Member

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    Cool! Congratulations!
    I'm looking forward to your report on any pops when operating relays
     
  11. Thiez

    Thiez Well-Known Member

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    I build myself a 100w SLO. The amps really have a sound on its own. I love the clean/crunch channel. The lead is a bit of love/hate... its amazing for smooth singing saturated leads, but not as good for face ripping raw shred solo's i think.

    Does the low output still make it sound like an slo? Guess it does, since the slo is mainly preamp focused sound.

    I did a dual eq, and have to say its amazing. Gives you a lot more control over the sound of the two channels. As well and a switchable brightcap on both channels.

    Warren haynes is also a knows SLO player with an amazing sound. Even SRV had played SLO somewhere in time.
     
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  12. Timbo

    Timbo Active Member

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    The relays work great , no pops.
    Hey Thiez, Got a few little problems to sort out.
    I think the little output valves are getting a bit of a hammering.
    It also has some hum I want to track down.
    I'm putting a 1x12 combo cab together so I can get a better idea of sound.

    Sounds pretty good so far.
     
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  13. Timbo

    Timbo Active Member

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    Hi guys, The SLO CLONE is just about done.
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    Hunted down a small hum, turned out to be a dodgy pot and a couple of resistors. :bat
    Working on a 1x10 cab. :thumbup:
     
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  14. jensvonbustenskjol

    jensvonbustenskjol Active Member

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  15. Timbo

    Timbo Active Member

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    Thanks mate, Got a bit adventurous with the tolex.
    [​IMG]
    [​IMG]
    [​IMG]
    The purple snake skin doesn't show up well in the photo's, very happy with the end result.
     
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  16. pulsonicsound

    pulsonicsound Active Member

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    one of the guys I use for my amp servicing had a Soldano in today from 1989, its the first time I'd heard one in person and it did sound great!

    its just annoying when stuff thats super expensive sounds great..
     
    Last edited: May 15, 2019
  17. Amadeus91

    Amadeus91 Active Member

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    That is truly a first class build inside and out.Respect.
     
  18. Timbo

    Timbo Active Member

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    Thanks:)
     
  19. Timbo

    Timbo Active Member

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    Hi guys, My stunt guitarist has put the amp through some awesome pickin.

    Mixed results...
    With the chassis in it's new box the hum still persists.
    Removed V3 the hum becomes very faint.(controls at 0)
    Removed phase inverter hum still remains.
    When adjusting the bias the hum almost disappears.
    Valves replaced and hum is loud and gets louder with volume controls turned up.

    Whilst playing slow and cleanish overall sound was great.
    Kicking into overdrive also sounded great when strumming and lightly picking but digging in things started mushing together.
    At this point I not sure if this was some blocking distorting.
    Even with the split plate resistors on the phase inverter and the 10k grid stoppers I think the grids are still getting a hammering.
    My next thought is to add a PPIMV to help tame the drive????
     
  20. Timbo

    Timbo Active Member

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    Hi guys, some more testing has been done...
    Haven't been able to track down the hum....
    I added a PPIMV and lowering the gain to the EL91s gave better control over the gain/volume pots.
    I replaced the pot with resistors and was able to dial in some great drive.
    But there is still a little too much drive when the lower notes are played.(notes get a bit flabby)
    So my next job will be to replace the .047 coupling caps to the power valves with either .022 or .01
    Hopefully this will help the flab.....
     

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