So I managed to pick up a Marshall ST1 PCB from ebay a while ago. Its setup as a 1987x which I've decided to convert to 1986 spec. Most of the parts have now been changed but I'm in two minds about how to do the bias circuit. You see its currently setup with a 220k resistor to drop the voltage to the bias circuit as its fed from one of the legs of the HT.
The transformer set that I've bought (inMADout) has a 60v bias tap which I'd like to use. What resistor value would I have to replace the 220k with? for some reason in my mind I have 22k but I've not tried to figure it out as I wouldn'tknow where to start.
Can anyone help? or even better, guide me through the calculation
cheers
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
"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
"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