Help with a 1967 Supro Taurus

[spinner75]

]I just found one of these and although it sounds awesome i'd like more break up and a little thicker sound. Also needs a 3 prong plug. Here's a pic of the schematic. Would anyone please be able to tell me which caps, resistors to change and for what values? Thank you very much.

http://i833.photobucket.com/albums/zz260/rpurdue/supro_s6625.jpg

[wall_of_sleep]

I would remove the Line Reverse capacitor first.

How is your tone when you change your settings on the Range Switch?

[spinner75]

Sorry, i'm an idiot with schematics. Where is that located? I find that the guitar setting is VERY thin and underpowered compared to the other two. If i lower the tone it is usable at least. I really like the low bass with the tone on 7 and volume cranked though. It sounds so thick and clear but still has only a hint of breakup with volume pinned

[wall_of_sleep]

I imagine the high bass should be a nice octave effect from what I see on youtube. While not hyped like a Thunderbolt, this is a hard to come by piece of equipment and may merit some caution in modifying the circuit.

The Line Reverse looks like a polarity switch. It is between your on/off switch and power transformer. When you install a 3 prong cable, you will remove this to isolate your chassis ground from your AC.

Gain and bass response is the tricky part. Something you're going to want input from more knowledgeable members.
Just from a gut shot and not suggesting you do these:
1MF V1 cathode bypass cap raised to 10-20uF will add bass response and a little gain
Increasing the 100k past your volume and the 47k before the PI should increase gain
If those didn't get me where I want, I would look into lowering the plate resistors on V1.

[spinner75]

Thanks Man. I appreciate the info. What about adding a 1meg volume pot instead of the 500k pot?