Check a later manual, these parts were not used in some versions, see the schematic notes.
" 13 - In units with serial No's below AX4355; R211-1, R212-1, R213-1, and R214-1, D219 thru D226 and C245, C246, C247 and C248 are not used."
I personally avoid Black Gate capacitors, they are no longer in production and had serious reliability issues.
Leave the originals in the drive limiter in place they should do there job well for many years since they only get used in maximum power peaks and have no effect to the audio path.
Last edited by dewickt; 06-11-2009 at 05:11 PM.