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Clone a Soldano SLO100
Clone a Soldano SLO100
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Old 12th July 2018, 01:19 PM   #1
blackwhaleamp is offline blackwhaleamp  Belgium
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Default Clone a Soldano SLO100

Hi
I am about to build a Soldano SLO100 replica. I have everything, but the layout. My main issue is about the ground. This is a high gain dual channel amplifier, and if I start to mess around with the ground.

Usually, this is what I do

- Ground star 1: very close to the power plug to connect the ground cable
- Ground star 2: close to the input jack. From there I connect a bare cable that goes all the way on top of the POT. Every single ground from the preamp is connected there
- Ground star 3: close to the Power Supply. I put another bare cable that goes from the power supply to the power amp. Here I connect the power amp ground, Power Supply ground and center taps
- I also use blinded cables for the signals coming from the Input Jack and Master Volume.

So far, this works properly in every amp that I made (from 5W to 50W mostly with clean tone and some effects like Reverb and Tremolo). I got a super low hum, and everyone is happy with the tone.

The thing is that after reading the article that I attached about Grounding, I realized that I might introduced some ground loops in my circuit.

So I would like to know if anyone has some pictures from the layout of a real Soldano. I think this would be the best reference to take

Thank everyone
Attached Files
File Type: pdf Grounding.pdf (610.7 KB, 20 views)
File Type: pdf slo-100_0_7.pdf (152.3 KB, 27 views)
File Type: pdf slo-100_psu_0_8.pdf (80.7 KB, 25 views)
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Old 12th July 2018, 08:07 PM   #2
voltwide is offline voltwide  Ireland
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Looking at the schematics this baby seems to provide tons of gain.

I suggest it could be critical to get this stable - but I am not a dedicated tube expert.
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Old 12th July 2018, 08:56 PM   #3
leadbelly is online now leadbelly  Canada
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There is a forum that specializes in cloning guitar amps that may or may not infringe on IP and may or may not have all the detail you're looking for.

Also, not sure if you realize a real SLO 100 uses PCB's for the small signal portion of the circuit?
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Last edited by leadbelly; 12th July 2018 at 08:59 PM.
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Old 17th August 2018, 02:00 PM   #4
blackwhaleamp is offline blackwhaleamp  Belgium
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Default Soldano SLO100 - Overdrive

Hi,

I built a Soldano SLO100 replica based on the circuit attached. I used a Tube Town PCB for the circuit.

I also followed some tips regarding grounding. There are two points attached to the chassis

1.- GND from power cord
2.- Circuit GND. This one is as closed as possible to the Input Jack. I used a bare cable to attach the different grounds from the circuit. I putted the Power Supply GND at the end of the bare cable, together with the Power Amp section

The amp works perfect, when I play NORMAL the sound is very clean and the hum is incredible low.

If I put the PRE-AMP OVERDRIVE Knob on maximum and I start to increase the MASTER OVERDRIVE, at some point there is a huge distortion noise coming from the amp. This is without the guitar connected.

When the guitar is connected, there is a feedback when I start to increase the MASTER OVERDRIVE.

I know this is a high gain amplifier, but I was not expecting all this noise coming from the amp.

There is anything that I'm missing from the built? Has anyone built a similar amplifier before?

Thank a lot, any help will be appreciated
Attached Images
File Type: jpg IMG_20180817_154001.jpg (245.5 KB, 58 views)
File Type: jpg IMG_20180817_154008.jpg (288.1 KB, 56 views)
File Type: jpg IMG_20180817_154013.jpg (283.8 KB, 55 views)
Attached Files
File Type: pdf slo-100_0_7.pdf (152.3 KB, 8 views)
File Type: pdf slo-100_psu_0_8.pdf (80.7 KB, 3 views)
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Old 18th August 2018, 02:14 PM   #5
jeff5may is offline jeff5may  United States
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Just for testing purposes, pull v2 and see what happens. I'm guessing that is where the feedback is coming from given the symptom description. If you have any, try a few lower gain tubes (12au7, 12at7) in that socket. There are a whole lot of places for signals to weasel their ways back into that spot. Lead dress and layout are super susceptible also.
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