Just picked up the arrma kraton and I'm running 2 3s lipos. I want to drop the rtr transmitter and run my MT-4s but none of the airtronics rx's seem to be able to take the 22v that the lipos put out. Looks like most of the rx's go u to 7.4v and the rx461 can only support 2s. So I'm I looking at the specs wrong or are there no 3s compatible airtronics receivers?? Thx

No receiver on earth that I am aware of can support 3s. That's why your speedo should have a BEC supplying the receiver with somewhere between 5 and 7 volts. If not, you will need a receiver pack or external BEC.

Also if you are running 2 3s packs wired in series (which appears to be standard on that truck) you are actually running 6s.

Ok so what actually happens is the speedo gets the power 1st and then knocks the voltage down and sends it to the receiver? If thats the case I should be good with just about any receiver..no? Your right, I meant 6s.Thx

Also what does BEC stand for?

Battery Elimination Circuit. Back in the old days, you had to run a separate receiver pack or some sort of voltage dropper to power the receiver until speedos started coming with BEC built in.

Cool..Thx!