What are these?!

[tonedawg]

Can anyone identify these little junctions on this board? Just wondering about their function.

[theehman]

Maybe test points that you can put your meter lead tip into while you make adjustments?

[iainpunk]

they are trim-pots (trimmers), probably for bias or similar applications. what kind of board is that, thats something that helps us find out the function of those trimmers.

cheers

[tonedawg]

This is actually a Trueman 1966 fuzz I am tracing. First time I've ever seen trimmers like that.

[iainpunk]

isn't it just a fuzz face without a gain control?

those trimmers bias the transistors.

cheers

[tonedawg]

The configuration is a little more complicated as there seems to be two of these trimmers on either side of the bias knob which seems a bit odd. The bias pot is a 500k and also seems to be going to Q1's collector and Q2's base. The third trimmer seems to be going to a portion of the bass boost circuit which is one a switch but I'm having trouble understanding the tracing there since there's multiple resistors in series. I going to have to study a bit more to try and make sense of all of it.

[Rob Strand]

The configuration is a little more complicated as there seems to be two of these trimmers on either side of the bias knob which seems a bit odd. T

They  would be used to set the min and max points so it sounds good/correct over the whole range of the pot.