Ref75 bias
I was sitting here, listening to my new ref5 and ref75, trying to get this break in process moving faster, when I had a thought. It was sounding pretty shrill and thin to me, which I just chalked up to breaking in. But I thought I should check the tube bias, since that is so easy to do. Well guess what...all four kt120's were way low on the bias voltage! I dialed them in, and most of the shrillness is gone, and bass has improved! At least it sure seems that way to me. Anyone have a similar experience with tube bias that was wrong from the factory? Is it just my houses power that might be a volt off or something?
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Marc...When you get a new tube amp, you will experience bias drift often in the first month. So you should check it once a week and rebias if needed. Once it settles in, it will stay pretty constant. At that point, I would check it maybe once a quarter to make sure it is biased properly. Hope this helps.
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The Ref75 is also my first experience with a tube amp. Ease-of-use being able to set the bias with the front meters was a big selling point for me.
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AC line voltage will effect the bias.
Don't adjust the bias unless the amp has been on for at least an hour. Since you're still breaking in your REF 75, I recommend giving it a couple of cycles with Track 7 on the Cardas/Ayre burn-in CD. |
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Like you I had to bias my Ref 75 on installation but it has been stable since (9 months). Great system you now have !
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Blaine |
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