Originally Posted by naamanf
The TRS shorts signal to ground when plugged/unplugged. If you like replacing MOSFETs go ahead and do it with the power on.
That statement, unqualified (e.g. as it stands), is utter BS & FUD. Briskly inserting/removing TRS plug with power on & volume down, for a properly constructed / adjusted b22 (w/1R R34/R35s as recommended for TRS), will not/does not cause any problems whatsoever.
I've used my b22(s) in this way, briskly inserting/removing headphone TRS plugs if/when necessary, dating back years (e.g. the "budget" b22 in sig - used most weekdays).
I've no qualms swapping headphones on it "hot", just turn volume down during the brisk insert/remove of TRS plug. Once on I leave it on for the day, whether swapping cans or not, if not swapping cans I leave 'em plugged in period, even through power on/off cycles (most all my b22 builds have e12s to protect against any DC offset during power up or down).
To each his own here and this very topic has been discussed ad nauseam here & elsewhere. People fail on each side of the fence on it.
If I didn't have high confidence in my b22 build w/TRS, or its proper adjustment, or it lacked >= 1R R34/R35, then yeah I'd consider powering off during w/the process.
Edited by cfcubed - 12/5/13 at 11:52am