What are these things inside my old RF amp?

[CaptNKILL 10+ year member]

I was cleaning up an old RF Punch 60x2 trans-ana amp that I got from someone several months ago and inside I noticed two little dials inside on the main board. They look just like the left and right gain controls on the back\outside of the amp.

Here is a picture. I circled the dials.





Does anyone know what these do? They are easy to adjust with a small screw driver or knife, but I don't want to mess with them without knowing what they're for.

Thanks

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[appleyard 10+ year member]

Those are called nipples

 

[CaptNKILL 10+ year member]

LOL

Nice... //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

Seriously though, I really want to know what these do.

Is there any chance they adjust the center frequency of the bass and treble boosts? I don't know if that's possible electrically, but it'd be nice if they could do that. //content.invisioncic.com/y282845/emoticons/redface.gif.62fdbfe1a101588a808c4cff71bcb942.gif

 

[ampjunkielikeme 10+ year member]

they could be to set the bias ..i wouldnt touch them..

 

[CaptNKILL 10+ year member]

they could be to set the bias ..i wouldnt touch them..

I don't know what "bias" means in this case, so I agree, I won't touch them. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[Haunz 10+ year member]

they could be to set the bias ..i wouldnt touch them..

Yep..

They control the amount of bias current going to the MOSFET gates.. there is no reason to mess with them unless you have changed out blown FETS..

 

[groundpound4200 5,000+ posts]

heh... I had a buddy with an old Rockford 200ix that took it apart and told me they were volume knobs. He cranked them all the way and his amp blew.... imagine that.