Kotrach

I know this thread is old but I got here with the same problem... and found the solution (for anyone with the same problem) http://www.fullcompass.com/prod/249357-Line-6-50-02-9331

Hi Guys, I wrote hoping someone can answer my question. I have a DT25 combo that i bought 2nd hand, I had to replace the stock power tubes and put a pair of JJ. I don't remember how it was before because there was a considerable amount since I played on that amp... Well, Class A mode sound louder (huge difference) than Class A/B (and it supposed that A/B are 25 watts and A 10). Anyone as any idea that what could happened? Class A/B mode sounds loud as I remember class A/B mode, but brighter... and class A/B almost a 1/3 lower than A at the same volume... I think that is not right... but I don't remember which mode sounded louder before... Suggestions? Sorry if I wrote something wrong, English isn´t my primary language. I'm from Chile. Thanks!