[TenTec] Centurion QSK board Mod

[<atrampler@att.net>]

I purchased a Centurion that was being used with an Orion.  The previous owner 
had made the mod recommended by Ten-Tec:  

"Note for older 422 Centurion amp owners: Using an older Centurion with the 
newest Ten-Tec HF transceivers - Pegasus, Jupiter, and Orion - may require a 
small modification to the QSK board in older Centurion amps for proper QSK CW 
keying. Short diode D2 (red diode, 1N4148, next to Q1) with a jumper wire. The 
current 422B does not require this modification."

I have an Omni VI.  Should I undo that modification, or is it benign?  Could it 
be the cause of the buzzing I detect at the relay?

Any thoughts are appreciated.

Art, KØRO