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[Tassieviking]

From what I have read today they are all closely related along with the SLO 100, Van Halen used the SLO 100 which is what Peavey used to make their 5150 (Named after Van Halens 5150 Studio), when Van Halen left Peavey they renamed the 5150 the 6505.
I would use the circuit that uses all 6 triodes but I am not the one who's going to make up a PCB.

Rob Robinette has a nice page on the SLO 100 amp with mods and several builds for 1 watt to 100 watt amps.

Soldano

How the Soldano SLO-100 & 50W Functions

robrobinette.com

 

[vigilante398]

I would use the circuit that uses all 6 triodes but I am not the one who's going to make up a PCB.

That's actually what I was looking at. I found a schematic for the 6505+ that has 8 triodes in the preamp, that seems like a bit much. I can probably make 3 tubes work if I'm patient enough, but Supersonic showed me that 4 tubes is too many.

 

[Tassieviking]

I think I saw 2 different schematic that used all 6 triodes, I think the 6505 had all 6 in one channel but there was another version where there were 5 used for the drive channel and one was used for the clean channel. The clean channel used the first and last 2 triode of the drive channel if I remember right.
Nope I just looked and that is the SLO100 that has the clean.

 

[vigilante398]

I think I saw 2 different schematic that used all 6 triodes, I think the 6505 had all 6 in one channel but there was another version where there were 5 used for the drive channel and one was used for the clean channel. The clean channel used the first and last 2 triode of the drive channel if I remember right.
Nope I just looked and that is the SLO100 that has the clean.

There wad definitely a version of the 6505 that I found that used shared 6 triodes across two channels, I want to say it was common first stage, the single stage for clean channel leaving the other two tubes for the dirt channel, so total of 2 triodes on clean channel and 5 triodes on dirty channel, which (if I recall correctly) is how the SLO does it as well.