OK, been playing with the core. I will post some pics soon of the unit, box, voltage LCD etc.
Manly playing with the Persei single head. So far I have used it with the SR-71 white, and the original herc. I have also used it on my Persei to drive the Cera EO/LL carts (I have a 601 - 3/8-24 adapter I got from a great member here). I can’t test with the black rod right now since I have an issue with it at the moment. However, the Cera EO/LL is 0.1 less in resistance so it pushes it harder than the black rod so I have no doubts about its performance with the core.
First this baby is a breeze to use. You just replace you standard tube and batteries with the new tube which has a socket on the bottom for the core power cable. You do need to use the ring on the original tube between the head and the tube to finish the unit.
Plug the core into ac, connect up to the tube, then adjust the voltage using the +/- switches next to the LCD. 0.1V up/down increments.
Initial impressions - look no batteries. No degraded performance from use. You can adj the voltage to the vape you like. I have found on my white rod it operates the best right around 7.1-7.2V. The Cera EO right at 3.8V.
The next thing I did is measure the voltage at the rod and compare it to the LCD display value.
I set the core to 7.4V and measured the socket output unloaded. 7.38V great. Now loaded with the white rod - 6.8V for 600mV drop. So the voltage on the LCD is at the unit and not the socket. The connection (wire, socket and Persei head drop the 600mV). I have measured the head before and its much less so the drop is in the wire between the Persei and the core.
This drop is a function of the current. The black rod and the white draw about the same cause the black is 1/2 the resistance, but gets 1/2 the voltage and current is linear. For me I ignore this because similar things happen with battery use. The battery drops voltage also. The best approach is to start at the nominal of the cart (like 3.6 or 7.4V) and adjust a little from there.
Now my 2nd unit is going to be installed in my truck. I am velco-ing to my console glove box and wiring up directly to 12V. The bonus is a USB power jack!
The only downside or con is the the tether of the cable, but I think you need that