pot knobs on amps

knightrider358 · Post by **knightrider358** » Fri Jul 17, 2009 1:54 pm

Ok guys before I did my install recently when I got my black ZX450 and Ti600.2 I took the covers off and cleaned the boards and all. While I had the covers off I noticed a couple of small pot knobs on the boards of each amp jus wondering what are these for exactly? Ive seen them before on allot of other amps before but never figured out what they are for. Any replays would be greatly appreciated thanx in advance

Post by **fuzzysnuggleduck** » Fri Jul 17, 2009 2:16 pm

Are you maybe talking about the bias pots?

knightrider358 · Post by **knightrider358** » Fri Jul 17, 2009 2:58 pm

prob what do they do

Thumper88 · Post by **Thumper88** » Sat Jul 18, 2009 12:57 pm

BCAE1.COM wrote:Many times, there is a bias adjustment potentiometer. It allows you to set the bias/idle current of the output transistors. If the bias is set too high, the outputs will run too hot and be more likely to fail. If set too low, the output could be distorted. There have been many instances where someone has gone into an amplifier and turned the bias pot up (thinking that they were increasing the power output of the amp). This caused the amp to fail. Unless a potentiometer is accessible from the outside of the amplifier, you should not turn it unless you know what it is. Having the bias current set too high is like having the idle setting on your car's engine set to 3000 RPMs instead of 750 RPMs.

Post by **ttocs** » Sat Jul 18, 2009 1:19 pm

F-it, crank it up and see what happens....

knightrider358 · Post by **knightrider358** » Sat Jul 18, 2009 4:47 pm

ya'll are crazy I aint touchin those unless I see fact if they are my idle controll

Post by **Jacampb2** » Sat Jul 18, 2009 5:05 pm

The two pots at the top left hand side of the board are right and left bias control. The pot at the lower middle right, just to the left of the power supply riser card, is the pot that adjusts the current regulation of the amps power supply. None of them should be adjusted unless you know what you are doing.

Later,
Jason

knightrider358 · Post by **knightrider358** » Sat Jul 18, 2009 5:22 pm

thanx jason

Post by **ttocs** » Sat Jul 18, 2009 5:29 pm

I know what I am doing, my dad is a tv repairman with a rightchus set of tools, I can fix it........

Post by **Jacampb2** » Sun Jul 19, 2009 3:28 am

ttocs wrote:I know what I am doing, my dad is a tv repairman with a rightchus set of tools, I can fix it........

Did you take it off some sweet jumps?