I'm restarting an amp I attempted to build a few years ago, as I never finished it. You guys were such a huge help last time, I'm hoping to capitalize on your intellect and hospitality once again. It's a simple parallel 6v6 amp with 6SL7 preamp. But this time I'd like to add a tremolo. I've attached the schematic. Pardon my untidy and incomplete work as I'm still figuring out DIYLC. If you could help me with these points it would be a huge help: 1. I stole the tremolo right off a schematic from a Ampeg R-12-R as it uses the 6SL7 I'm hoping to use. Should this be switched or can I used a larger Strength pot to basically shut it off at full resistance? 2. How similarly should this stage be biased compared to the previous gain stages? I liked the idea of using an LED to also display the frequency...Any issues with this? 3. Unrelated: what is your choice over the usual Princeton Tone Controls for a SE amp? Hope this isn't too much for one thread. Thanks in advance, you guys rock!