Looking for TN2002 transistor for 400a and 4000 meter boards

[Eric M]

I have a Threshold 400a with a malfunctioning meter board which I thought I'd rebuild since it's out. There are 2 transistor marked TN2002 which I can not find. I've gone to Alltransistor.com trying to find a replacement but no luck.

Would anyone know a substitute transistor?

Thanks,

Eric M.


**** OK, tried attacking from other direction. Schematic labels transistor as A42 (a Threshold house #) but you people here already assigned a part number of MPSA42 in the post

A42 in Threshold amp

If I missed anything, please post up.
Thanks

 

[Zen Mod]

that's it

 

[kasey197]

2n2002 ?

 

[Eric M]

that's it

Thanks!

 

[Zen Mod]

or you can use Zener diodes, as Pa said

 

[Eric M]

I think I'll stick with the transistors just to be true to the schematic (and board).
But I loved the response:

"Why use back to back A42's instead of Zener diodes?"

"Because we had a full box of them sitting on a shelf we weren't going to use"

😀😛