I have a vintage 1968 Traynor YBA-1A Bassmaster Mk II head that's a wonderful amp, especially after I recently re-capped and retubed it. One thing is sort of driving me nuts, though. The amp has an internal fan, which I've read is to keep the power tubes alive since this amp has a crazy high plate voltage to allow the 2xEL34s to produce 90 watts. That's great, but the fan is sort of loud when playing at a low volume (studio or practice, usually with bass). It's easy enough to disconnect the leads to the fan by unclipping the little connector, and the amp seems to work fine without the fan on. Is this dangerous? I'm wondering if the fan is necessary when the amp is turned on at all, or just when the amp is being played loud and those tubes are actually putting out more than the normal 50 or so watts for 2xEL34s? I definitely don't want to hurt my amp! I know I could probably find a replacement fan, but I thought I'd see if the simple solution works first.