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impedance selector switch 100 watt

Posted: Fri Mar 02, 2007 9:17 pm
by dast
can anyone give me the pin numbers for the selector switch?
I think it's
1: black
2: yellow and purple
middle: green

it looks like middle also goes to an output jack, as does the brown lead from the output txfmr.

Is this correct? And where does the purple wire go to? The presence knob?

thanks so much,
Dave

Posted: Sun Mar 04, 2007 3:42 pm
by dast
ok, so I think I figured out my layout question using the continuity tester on my multimeter. I think my layout above was correct. Still, can anyone verify that the purple wire (negative feedback) goes from the 8 ohm tap (or any of them) to the presence knob?

which terminal on the presence knob?

thanks,
Dave

Posted: Sun Mar 04, 2007 3:59 pm
by rockstah
Image

the purple wire from the 8 ohm tap goes to the feedback resistor on the board.
from the feedback resistor a purple wire the presense pot.
Image
note: in thsi picture my feedback is right on the speaker jack but you can see how the presense is wired.

thanks!

Posted: Sun Mar 04, 2007 8:19 pm
by dast
thanks,
I get it now. This is my first build that's not a tweed fender, so there have been some differences!
Dave

Re: thanks!

Posted: Sun Mar 04, 2007 8:43 pm
by rockstah
dast wrote:thanks,
I get it now. This is my first build that's not a tweed fender, so there have been some differences!
Dave
my first build was a tweed as well. ;)