We were talking a few days ago about bypassing the reverb and using the + and - 14.7 volt taps to power an onboard FX pedal or a 9 VDC line out. As Steve mentioned, you'd need a voltage regulator to stabilize and lower the voltage, and I came across this handy little site when I was looking at maybe lowering the 14.7 taps to 9v:But, I wonder if the open circuit could now be used to internalize some effects? Any hows in that direction would be appreciated by me as well.
If you don't want to do that, Ted Weber sells an onboard FX power supply kit that looks really sweet https://taweber.powweb.com/store/modkits.htm#eps
(it's the Pedal Pump Effects Power Supply kit). This actually includes a separate transformer that will give you a bunch of 11 and 9 volt AC taps plus 4 identical small circuits that will rectify and regulate down to 9 volts at 300ma each. 500 ma would be more ideal to run some major power suckers (like delays, etc), but 300ma should work for most anything nonetheless.
You can probably even just modify Weber's little Pedal Pump circuit board to remove the rectifier and beef up the regulator to use with your 14.7 volt taps.
Lots of options here.