I've got some schematics of some amps that I wanted to build or have build for me, as I don't know much about
building amps. Apperently the Soldano SLO clone is one of the easiest amps to built and sounds like a hot rodded marshall.

@Neph: So you also build MCCs ?
Which panelbuilder are you with?

Graeme Parfett wrote: @Neph: So you also build MCCs ?
Which panelbuilder are you with?

yup....

Sorry cannot say.....

Seeing as you build the power caps on Vero board.. are you not worried that the track width will be too small for the high voltage and that it will 'spark through'?

Gearhead wrote: Seeing as you build the power caps on Vero board.. are you not worried that the track width will be too small for the high voltage and that it will 'spark through'?

you are 100% correct, I only used the board for placement and use wire to join the components underneath , I must admit that vero board is the worst stuff you can use with high voltage....
but I took care in separating the +HT voltage rail from the ground rail by gently cutting large spaces between them. Turret board is the way to go....

Can`t wait to hear what the amp sounds like.....

Thanks for the lovely photos. I think your project is very inspiring. A few questions comes up for me:

Why did you choose to put the EL34's closest to the controls (vol/t/m/b)? You might have to consider putting a shield plate between the controls and the output tubes to eliminate hi frequency oscillation. Those pots are like radio antennae.

6 pre-amp tubes! Are you doing a channel switching amplifier?

Good luck with the project.

Karel Mars wrote: Thanks for the lovely photos. I think your project is very inspiring. A few questions comes up for me:

Why did you choose to put the EL34's closest to the controls (vol/t/m/b)? You might have to consider putting a shield plate between the controls and the output tubes to eliminate hi frequency oscillation. Those pots are like radio antennae.

6 pre-amp tubes! Are you doing a channel switching amplifier?

Thanks for the reply.....

I did not perceive that happening but I am certainly going to consider your info.... I guess that the El34's are less sensitive than the pre - amp tubes which are extremely sensitive to ac noise.....

I think some aluminium foil (covered in plastic)over the controls will do the trick to isolate any high frequency.

There are only 3 gain stages with a toggle switch to eliminate one gain stage before the cathode follower
stage...

The last two 12AX7 tubes are for the driver/phase inverter stage.

I would put a divider plate the full depth of the chassis just behind the pots. Otherwise, when you wire your amp, wire it in such a way that you can insert some screening without having to rip out all your work.

Consider that you are swinging a few hundred volts signal (could even be more than power supply) at the anode of the EL34's. That is just about a radio transmitter. And supersonic frequencies have a habit of perpetuating themselves through the power supply or earth rail (and other devious ways).

What type of driver/phase splitter are you using? Split load PS + differential driver? You have a lot of gain available (2 X 12ax7) - maybe cathode follower drivers?

Progress Report 01/01/2009

--> wiring of power supply, bias supply, preamp, tone stack, valve heaters, power valves , preamp valves,
rectifier, transformer/chokes & protection relays 80% complete...

--> Testing phase: pending...

--> Biasing of valves pending...

--> enclosure build : pending...