zardon
100+ Head-Fier
- Joined
- Apr 26, 2011
- Posts
- 307
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- 77
Just curious, did you have to reset the bias voltage back to 0 when you put the XF1's in?
You should always BIAS tube amps when putting in new tubes. I BIAS them every couple of months regardless as they will change (first time I would bias them 5 minutes after start up, then 1 hour in as the amp settles). But its critical when putting in new tubes. With the BHSE, its only a 2 minute job. If you need help Justin has a video on youtube, you only need a cheap AC DC Voltmeter set to 1000V from somewhere like Amazon (£20 or so) and the pin layout is pretty straightforward but you probably already know this.
I was quite surprised Justin didn't supply the standard tubes with LF (left front) RF (right front) LB (left back) RB (right back) markings etc, as even bog standard matched quad EL34s from Russia have a little variance. Then again if they are slightly out its not a massive issue - I just have a bit of an OCD with BIASing as it can really wear down the tubes faster if they are configured badly.