I love my Fender HRdlx - it does exactly what I want it to.
I got it second-hand and I think it is stock. On Thursday it started distorting badly on lower notes (normal channel) which disappeared when I rolled the volume back a bit.
I thought it is probably a preamp valve going and, as I don't have reliable spares, I thought I might as well get a set and treat it to new ones, using the old ones as spares. I don't have time to fiddle about trying to work out which valve is the dodgy one anyway - and I can't reproduce the problem at home volumes.
So I thought I would check the biasing prior to changing anything - and it is around 85mV. I think it should be between 70 and 90, but should I bias the new valves the same way at 85mV or should I go lower? I like the way it sounds now but I don't mind a bit of experimenting. I've ordered matched JJ 6L6GC to replace the original GT6L6B.
As I won't get much opportunity to identify the faulty 12ax7 can anyone give me a clue which might be faulty to save me carting it around as a spare?
Comments
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Although when it comes to ampy things ICBM is usually right I have to disagree with this bit. A lifeguard at the local baths ejected me once for carrying spare valves in my trunks and when I thought about it afterwards it probably wasn't a necessary scenario.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
That should only work if More Drive is selected - the plain Drive only uses the first half of V2.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein