[sdiy] table radio preamp vs. guitar amp preamp (saf-t amp revisited)

[anthony]

OK I have some good schematics to get me started on the amp that I mentioned 
a while ago - you know the one using a 12SQ7GT and a 50L6GT. The cool thing 
is that it looks like I won't need very many parts at all.

But I can't seem to figure out the best way to set the 12SQ7GT to have the 
kind of gain you'd want in a guitar amp. The way the tube is biased doesn't 
make sense to me. The cathode just goes straight to ground and it doesn't 
look like the grid is biased negative. The plate voltage is about half of 
what the preceding step is would that effectively bias the grid? Also given 
that I only have one triode to work with I'm not sure where the best place 
to put the volume control. The radio schematic puts it before the preamp 
tube, but if I do it that way it would just go right to the input. I know 
that that would work, but I'm not sure if it's best for what I want to use 
it for. I guess since it's such a simple circuit I could try different 
things, but I think I'll be better off if someone could steer me right.

aa