Marty Marts Tornado built, but has a small problem

[John Lyons]

Marty

If you can send me a vero layout and a piece of vero I'll give it a shot.
I can make you a PCB in trade. Only one thing, we need to get a PCB hammered out with the newest revisions.
Shipping will be cheaper without the parts and the layout is the main thing.

With the parallel fets I guess it would lower the gain. I was thinking the opposite though, as in the marshal amps with parallel stages.
Grids, plates and cathodes (gates, sources and drains) are paralleled.
I have a matchelss chieftain clone I made and it gets a good amount of gain.
Thought I'd try to make a FET pedal version of it.

I bread boarded it up and when I pulled one of the FETs from each pair there was no real difference...!?
I guess I need to fool with it some more and start another thread...

John

[MartyMart]

OK, give me a few day's for a final revision and I'll draw up a layout and send
you the vero, perhaps half layed out ?
Good luck with the parallel idea, sounds interesting !


MM

[manson]

How is it going Marty? I was following this topic because your tornado sounds so incredible! Any updates?

[John Lyons]

I don't mean to speake for marty but here's the scoop:

Marty has been redoing the circuit to get the noise down and Gaussmarlov has the layout pretty much squared away.
Marty says his new version sounds very close to the original.
With any luck we can get this thing fired up and tamed as far as noise.
I built the new schematic values version on Gaussmorkov's layout but I need to finish it still.
I'm sure marty will post in the next day or so with some refinements. 

John

[MartyMart]

Still chewing on this one folks !
My V2 was getting close but has developed a nasty "hard edge" to it, with almost a
"sharp clip" to the front of every note - seems way too compressed also !! 

More work to be done I'm afraid ....

MM

[John Lyons]

Bummer! I was thinking you were getting close. I listened to my clips of it and listened to your initial clips and they sound great, noise or not.
This one has to see the light of day at some point.

John

[MartyMart]

Yeah those V1 clips are great, little noise or not !!
Even though it's not perfect with all the gain boost and dividers, it has MAGIC
At this point, V2 isn't even half as good a tone, could be several things but the way
each boosted/eq'd stage HITS the next is making a huge difference, jfet variations
also comming into play !
Perhaps there's a reason for limited commercial jfet circuits

MM.