Twl
I have never had a glare problem with the Berning. Actually it is only the second tube product I've ever owned that didn't have this problem which was usually fixed with rings and better tubes but never completely eliminated, especially the high frequencies which is damn annoying trying to correct. The Transcendent OTL was the only other tube amp that didn't do the ringing/glare thing. I also had this problem with several pre-amps as well. I suppose it can't be ruled out. I would be more inclined towards a bad tube being the culprit rather than the absolute quality of the tubes being used. The tubes are operated very conservatively in this circuit so while better tubes will yield increased performance a bad tube would present very audible problems. Peter if you have access to a tube tester, check out the tubes to see how they measure. Maybe you have a short in one or more.
If all else fails, I will recommend the following tube compliment I use 12AT7's Brimar Black Plates NOS 1950's, 5965's GE "5 Star" NOS Platinum 1% pair 1970's for the input/drivers and you may want to get in touch with Allan Bhagan @ info@allanbhagan.info for the cryogenically treated 6jn6 outputs. These tubes especially made a dramatic increase in performance, like a component upgrade. I still think you have a problem elsewhere, including the aforementioned bad tube (s).
I have never had a glare problem with the Berning. Actually it is only the second tube product I've ever owned that didn't have this problem which was usually fixed with rings and better tubes but never completely eliminated, especially the high frequencies which is damn annoying trying to correct. The Transcendent OTL was the only other tube amp that didn't do the ringing/glare thing. I also had this problem with several pre-amps as well. I suppose it can't be ruled out. I would be more inclined towards a bad tube being the culprit rather than the absolute quality of the tubes being used. The tubes are operated very conservatively in this circuit so while better tubes will yield increased performance a bad tube would present very audible problems. Peter if you have access to a tube tester, check out the tubes to see how they measure. Maybe you have a short in one or more.
If all else fails, I will recommend the following tube compliment I use 12AT7's Brimar Black Plates NOS 1950's, 5965's GE "5 Star" NOS Platinum 1% pair 1970's for the input/drivers and you may want to get in touch with Allan Bhagan @ info@allanbhagan.info for the cryogenically treated 6jn6 outputs. These tubes especially made a dramatic increase in performance, like a component upgrade. I still think you have a problem elsewhere, including the aforementioned bad tube (s).