Common cathode or common anode?

[Den.]

I'm working on my Peavey amp and I need to replace a few 3mm, 3-leg LEDs. In ordering, I have a choice of common cathode or common anode. How would I determine which I need?

[mandu]

The picture you posted shows common cathode (connected to the -ve).
The other two are for red or green (or yellow if you power both) goes to the +ve
The limiting resistor may be 1 if wired on the cathode or 2 nos. if wired from anodes.
regards.

[Den.]

I'm working on my Peavey amp and I need to replace a few 3mm, 3-leg LEDs. In ordering, I have a choice of common cathode or common anode. How would I determine which I need?

I just found these schematics online; perhaps they tell what the LEDs are.

[Den.]

The picture you posted shows common cathode (connected to the -ve).
The other two are for red or green (or yellow if you power both) goes to the +ve
The limiting resistor may be 1 if wired on the cathode or 2 nos. if wired from anodes.
regards.

Thanks for your help.

[WimWalther]

The basic diode symbol consists of a triangle with a bar across the point. Other diode types (zener, schottkey, tunnel, LED,etc.) are slight variations on this basic symbol.

But in all cases, the bar is the Cathode and the triangle is the Anode. This is universal.