I added similar info (and pics) to my other thread regarding my new (used) full stack purchase on-line from GC in East Brunswick, NJ - which worked out great and packaging was second to none.
However, it led me into another topic regarding Bias, and I did do some research on it but still have questions....
I am selling one of the awesome big bottom 1982BJH cabs and I originally planned on selling one of these heads (I bought the stack to get the slant cab - I already owned a mint JH head and a 1982BJH) but I can't decide which head I like best - they are very similar and mint - however the amount of breakup and headroom is noticeably different. My new one is not quite as loud and breaks up easier vs. my original head is cleaner and louder. Also, my newer oner has more gain when maxed than my original head - both are excellent to say the least.
I tested them extensively - they both appear stock, even the tubes. (both appear to be as brand new)
This makes me wonder if it's due to bias...?
If biased lower, will this mean more breakup and less headroom? Does higher bias produce more headroom typically? And which one is harder on the amp - low or high? Or would this only affect the power tubes?
Ex: Tube Depot tubes display Bias Point on the tube sticker - 27 is said to be more distortion vs 33 which is more headroom. Does this also relate to the mA or whatever you set the amp bias to?
Also does biased colder mean biased lower? I asked the guy on the phone if biased colder/lower produced more distortion and less headroom but he said that would mean it's biased hotter instead - I wondered if it was opposite...? I'm a little confused here about this subject, obviously - and thought I read the hotter bias produced more headroom, but I may be mistaken. Also - after further review possibly these (lower mA and "Colder") could be 2 dfferent things.... or are they the same?
Is it just 1 internal trimpot adjustment that handles the Bias on this type of amp?
Thanks for your time!