Amp biasing question

Yeah, the turn on/off sequence is mainly to avoid a nasty "pop" noise from preamp turn on or off going through the system. You got it, @immatthewj 

Separate issue from biasing in my book. 

@whart  , yes, I agree that is separate from biasing.  And I may have misunderstood the postings I have been referring to.  I just was getting the impression that before turning the amp on, the pre should always be on.  If I had that right, one would have to have his or her preamp on while adjusting the bias.

The point of sequencing is in case your preamp causes a thump when turned on.
This way I f the amp is off, the thump does not go through to the speakers. If your equipment doesn’t do it, then not something to worry about.

My preamp or up stream equipment does not produce any noise, so it doesn’t mater. I don’t think I owned a piece of electronics that thumped for decades.

All of my equipment is tube and has a delayed soft on. So, no racket regardless of the sequence. 

@ghdprentice  , do you bias your ARC with the preamp turned off or on?

ghdprentice

The point of sequencing is in case your preamp causes a thump when turned on.
This way I f the amp is off, the thump does not go through to the speakers.

Yes, agreed.

If your equipment doesn’t do it, then not something to worry about.

Here I disagree, because preamps can fail on startup, and especially tube preamps can send nasty noises in such an event that will reach your speakers if the amplifier is powered first.

In an unusual sloppy mood last year, I failed this best practice that I'd followed for years. That's when tubes in my ARC REF5SE blew and it shook the house. (Fortunately, no collateral damage.)