Wanted Looking for studer PTC 57.99.0209

[salomonander]

Headline says it all… i need two studer ptcs partnumber 57.99.0209

Maybe someone can help? I dont have enough info in order to find a modern part replacement.
Cheers

 

[salomonander]

Found out that is was made by philips. Part number 2322 662 91005
A datasheet would help as well

 

[zamproject]

First entry in my googoool serch...
https://www.casa.co.nz/resistors/nonlinear/Philips-NLR-Data-1977_29p_ocr.pdf
page 27
Look like standard with 300mA threshold
This is an old ref, I have no idea how PTC self age If you are looking for NOS part.
Should not be difficult to find equivalent or substitute with a polyfuse if it's used as current limiting ?

For what Studer circuit is it ?

 

[salomonander]

Thanks! Gosh i had found that document but i looked at the wrong page so thanks mate! What are the important values when looking for a modern replacement?
They are in the -24vdc and -6vdc lines of a vca fader (marked in red). I think its a 900 series mixing desk.

 

[zamproject]

This may be confirmed, but PTC chemical substrate may correlate R and I threshold, so any 5.6Ω (which is a standard value as the one in your schemo) may start to act around 300mA ?

Also to be confirmed but as current limiter that seem to be function here, any polyfuse (different method with no oxide but polymere) may be used.
In this case you can choose closer threshold value according to circuit consumption, like you do with a standard fuse
Measure I for each rails and pick the value above (Ihold)