The Q Switch works fine, just that the Ampeg has the typical growl.
Got it - so you're looking for a clean, powerful sound. Kenbass4 has an Ampeg (SVT I think), but not sure if he has an SF-2. I would think that a big part of the Ampeg sound is the power-amp tubes, so even with a clean preamp, it might still get that Ampeg drive...
Hey, I just noticed you're in Braintree! I used to live in Bedford, and was just visiting out there - stayed with a friend in Marlborough. I miss Massachusetts...