Sparks910
Member
Hi guys,
I've just finished modding my DSL20H as close to the AFD #36 as I can and wanted to share. I'm pretty happy with it overall so here's the schematic and some sound clips.
The Green channel retains the built in tonestack but both cathodes have changed so it does get more distorted than stock.
The Red channel is reduced greatly in gain and tonality has changed now with the majority of mods to this channel to mirror the AFD #36/34 circuit.
The "inspiration" from the this mod comes from various iterations of the #36 schematic on the web and the preamp of the SL5/AFD100.
The good thing about the DSL20 is it has 4 gain stages and a plate driven tone stack as standard which means no drilling/mounting extra tubes to do the 36 mod! it can be put back to 100% stock easily.
Also with the design of this board I was stuck using a 1uf in the first gain stage as the cap is hard against the board and underneath is the tube socket for V1 so the cathode is a bit different to standard JCM800.
I've also added a switchable Cold clipper with a 10K and 39K option to control the overall gain - this is awesome!
If anyone is looking to do something similar feel free to use this as a base. By no means is it 100% accurate to the original #36 and is based on Santiago's amps that he made for Slash.
I also took inspiration from Jason over at Headfirst with his SC20H #36/34 mods as well.
Anyway this was definitely worth the effort as to buy a SC20H vs a DSL20 here in Aus is about $1000 extra for the SC20 and it doesn't have a loop or 2 channels.
You also cant find an SL5 or AFD100 anywhere so this was my next best option.
Recording chain is Les Paul Classic with PAF's >DSL20 red channel >JohnH attenuator/load box >Scarlett solo >Ableton Live >NadIR with Leon Todds Marshall 4x12 Greenback IR.
No other post processing or effects. Straight into the desk.
39K Cold Clipper
10K Cold Clipper
Schematic attached
Thanks,
Mark
I've just finished modding my DSL20H as close to the AFD #36 as I can and wanted to share. I'm pretty happy with it overall so here's the schematic and some sound clips.
The Green channel retains the built in tonestack but both cathodes have changed so it does get more distorted than stock.
The Red channel is reduced greatly in gain and tonality has changed now with the majority of mods to this channel to mirror the AFD #36/34 circuit.
The "inspiration" from the this mod comes from various iterations of the #36 schematic on the web and the preamp of the SL5/AFD100.
The good thing about the DSL20 is it has 4 gain stages and a plate driven tone stack as standard which means no drilling/mounting extra tubes to do the 36 mod! it can be put back to 100% stock easily.
Also with the design of this board I was stuck using a 1uf in the first gain stage as the cap is hard against the board and underneath is the tube socket for V1 so the cathode is a bit different to standard JCM800.
I've also added a switchable Cold clipper with a 10K and 39K option to control the overall gain - this is awesome!
If anyone is looking to do something similar feel free to use this as a base. By no means is it 100% accurate to the original #36 and is based on Santiago's amps that he made for Slash.
I also took inspiration from Jason over at Headfirst with his SC20H #36/34 mods as well.
Anyway this was definitely worth the effort as to buy a SC20H vs a DSL20 here in Aus is about $1000 extra for the SC20 and it doesn't have a loop or 2 channels.
You also cant find an SL5 or AFD100 anywhere so this was my next best option.
Recording chain is Les Paul Classic with PAF's >DSL20 red channel >JohnH attenuator/load box >Scarlett solo >Ableton Live >NadIR with Leon Todds Marshall 4x12 Greenback IR.
No other post processing or effects. Straight into the desk.
39K Cold Clipper
10K Cold Clipper
Schematic attached
Thanks,
Mark
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