Rod,
I don't know about the question concerning running two in series. That will have to be answered by someone who knows more about it. But I'm using the Topaz myself (have had five different ones in my little AC journey) and they are fantastic, especially for the price/performance
Here's three other thoughts to ponder.
1. I was advised that the output rating of your transformer should be no less than 10x the power consumption of your components. So a component drawing 35 watts should have a minimum of a .35 Kva transformer. Components whose total output draw is 100 watts should have a minimum of a 1 Kva transformer. This is simply to allow more than adequate headroom, like an amplifier.
2. If you're using two transformers, if you hook your digital components into one, and then plug that transform into the other, it will keep any digital AC grunge from flowing back into the line to your preamp and amp. Of course this requires a bigger main transformer.
3. Using the same thinking as above in #2, have your digital components on one transformer into the wall and the preamp and amp on the second transformer into the wall.
Don't be afraid of going too high in power, I'm using a 5 Kva Topaz on a 15 amp circuit. As long as you don't overload the 15 or 20 amp circuit you're using, thinking that you have 40 amps, you should be fine.
Also remember that the lower the capacitance, the better. The .0005 pF is the best, then the .001 pF and then finally the .005 pF.
Chuck
I don't know about the question concerning running two in series. That will have to be answered by someone who knows more about it. But I'm using the Topaz myself (have had five different ones in my little AC journey) and they are fantastic, especially for the price/performance
Here's three other thoughts to ponder.
1. I was advised that the output rating of your transformer should be no less than 10x the power consumption of your components. So a component drawing 35 watts should have a minimum of a .35 Kva transformer. Components whose total output draw is 100 watts should have a minimum of a 1 Kva transformer. This is simply to allow more than adequate headroom, like an amplifier.
2. If you're using two transformers, if you hook your digital components into one, and then plug that transform into the other, it will keep any digital AC grunge from flowing back into the line to your preamp and amp. Of course this requires a bigger main transformer.
3. Using the same thinking as above in #2, have your digital components on one transformer into the wall and the preamp and amp on the second transformer into the wall.
Don't be afraid of going too high in power, I'm using a 5 Kva Topaz on a 15 amp circuit. As long as you don't overload the 15 or 20 amp circuit you're using, thinking that you have 40 amps, you should be fine.
Also remember that the lower the capacitance, the better. The .0005 pF is the best, then the .001 pF and then finally the .005 pF.
Chuck