Power Tranny Grounding Question...Orange wire

[flying snake]

Hi Folks...I recently completed a 5f6a bassman (head) project and noted something that I wanted to ask about. The orange wire on the power transformer. . . . Should that wire be connected to ground. The building instructions for the amp did not mention that wire at all. Is this orange wire always grounded and maybe that's why it wasn't mentioned in the build instructions??? For now, I have the wire coiled up and zip-tied and tucked out of the way. The little spec sheet that came with the tranny identifies the orange wire simply as "ground" and on the diagram on the spec sheet it is on the left side, underneath the two black leads. I have played the amp a few times and wasn't electrocuted. What do you think??? (Thanks)

[nico.verduin]

The orange wire is probably a shield wire. This is connected to a copper foil around the primary coil and serves two purposes:
1) Protects against sparks from the primary to the secondary coils.
2) reduce Hum through electro-magnetic transfer.

[dai h.]

if that is a connection to a copper shield, it provides an electrostatic shield not an electromagnetic shield.

[tonezoneonline]

To answer your question.It should be grounded.

[Bruce / Mission Amps]

The orange wire is most likely a frame ground.
It is there to make sure the tranny is grounded to the chassis in case a big short takes place internally and the PT's, frame, laminations or bell covers are accidentaly not really grounded.
Note that most all lamination bolts, use to mount a PT, are usually insulated from the frame of the PT so just bolting it down to the chassis doesn't mean anything as far as grounding goes.
In the event of an internal short, that should blow the mains fuse and keep the end user relatively safe.

[flying snake]

Thanks everyone! ....I have a grounding lug where the filter cap is mounted. Am I correct in grounding this orange wire there?