According to R.G.'s article on the Austin Treble Blaster / Dallas Rangemaster, you're shooting for 6.6v -7.2v for the collector voltage.
http://www.geofex.com/Article_Folders/Rangemaster/atboost.pdf
Should I look for similar voltages on the Orange & Appollo Treble & Bass Boosters? If not, what should I shoot for?
(http://www.geofex.com/FX_images/orngbst.gif)
(http://www.geofex.com/FX_images/apolobst.gif)
thanx
..