Thanks Ken. My servos are a combination of Futaba S3003 and S3004's. The S3003's are 3-4 years old (very little usage) and today's specs show torque and speed for both 4.8V and 6V so I am assuming I am good to go. I only ask the question because in some older threads, I have seen mention of detrimental effect of 6V on servos.