Not quite sure, but I would like to test the final drivers in circuit, both to know how and to make sure they are OK? Hmm. The service manual says 1.5 amps per. My reading indicates that this is the idle current that was blowing finals and the rumor is that Yaesu now sets them to 1.25. I set mine to 1 amp even and have seen mentions of folks using that. Is that enough of a difference to affect linearity? And would the biggest affect of non-linearity be splatter?