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I've searched around a bit but never really found much info about running perforated plates and bubble cap plates together in the one still so I decided to do an experiment and the answer, for my set up anyway is yes they work fine together.
I am currently running a 4" solid body 5 perf plate still with 4 bubble cap sections bolted to the top for a total of 9 plates and it is running fine. I would run one more bubble cap section but am limited by ceiling height. Boiler charge is 35l of 30% low wines and I am running 2 x 2400 watt heating elements with one on a controller. All plates are loaded and bubbling away like they should and it seems to be very responsive to water flow and power input changes, more-so than running all perf plates or all bubble caps but that might just be the number of plates I am using.
Hearts are just starting to come through now and the transition between heads and hearts seems fairly well defined. I'm just going to play around with the water/power settings to see what speed I can get for the hearts run. Only problem is the crappy alcometer I got from the Ukraine that has sunk and won't actually float up to tell me what the ABV is but at a guess due to the low wines, the number of plates and the alcometer only going to 96% it would be around 95% after temp correction.
Over all I'm pretty happy with the results so far.