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Feb 20, 2005, 10:01 AM
Battery Junkie
wrenwright's Avatar

Futaba "J" connectors vs. JR-type connectors

What is the difference between Hitec HS-81 servos with a Futaba "J" connector and the ones with the JR-type plug?

The guy at the LHS sold me some Hitec 81's that are JR's, but I'm using them with a GWS Rx and a Futaba Tx.

Is the only difference that the Futaba J-style have the locator tab on the plug?

Seems like JR-type servos will plug into the Futaba Rx, but not the other way around.

Will I be ok using these with a GWS Rx and Futaba radio?

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Feb 20, 2005, 10:04 AM
Registered User
LesUyeda's Avatar
The keying tab on the Futaba J, and the fact that the corners are beveled on the JR, are the only difference. You will have no problem, but will have to pay attention to keying orientation.

Feb 20, 2005, 10:16 AM
Battery Junkie
wrenwright's Avatar
OK I thought the servos themselves were the same. I have to check the wire orientation on the GWS Rx anyway, so that's not a problem.

I suppose JR brand servos could be used on a Futaba Rx, but not the other way around then?
Feb 20, 2005, 01:12 PM
Registered User
ebill3's Avatar
JR, Hitec, and new Airtronics plugs can be universaly used. Futaba plugs must be modified to fit most other receivers, unless they are without hard cases.

Last edited by ebill3; Feb 20, 2005 at 01:14 PM. Reason: type
Feb 21, 2005, 01:42 AM
Battery Junkie
wrenwright's Avatar
Well, that pic you posted cleared up everything!

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