Zener Diode Circuits

What is an equivalent part for ct8ph zener diode?

I am working on repairing a circuit and I have found a component that looks like a Zener Diode it is marked CT8PH. I want to replace it because it is damaged but cannot find a replacement part.

Maybe the T is actually a 1 ???

C18PH is a Philips Semiconductor marking for either a BZV85-C18 or a BZX79-C18.
See http://www.datasheetarchive.com/BZV85%2FC15-datasheet.html

They are both 18V zeners. BZV85 is 1.3W, BZX79 is 0.5W.
They are different physical sizes, check out the data sheets to see which is the correct replacement.

The C means 5% voltage tolerance, A18 and B18 are tighter tolerance parts (1% and 2%)

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Can i replace the diodes in this distortion circuit with zener 1NT4742A's?

here's the schematic: http://www.instructables.com/files/deriv/F0V/3X4V/FINO74G5/F0V3X4VFINO74G5.MEDIUM.jpg
i know the LED needs to stay, but i cant find the diodes in the schematic anywhere except all electronics and their shipping rate is ridiculous, so i want to know if i can use the 1NT4742A's i already have instead.

1NT4742A is a 12V zener. Since your circuit runs from a 9V supply, the zener action should never come about and these should behave like simpe rectifiers.

The diodes specified in the schematic are also available here:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=1N4148FS-ND

I have insufficient information as to how these will work at audio frequencies. There should be no harm in trying them, and seeing if they do the job.