Stasis S-150

[exponent]

I have a S-150 that served me well for 30 years but some of the transistors have packed it in. I am looking for a schematic and possible recommendations for substitute transistors for voltage and current gain stages. Any help is greatly appreciated

 

[Zen Mod]

stasis | Search Results | Zen Mod Blog

 

[baeijsman]

Schematic:

 

[vdi_nenna]

You probably know this, but it bares mentioning.
You should change all the electrolytic caps while you are in there.

That's a nice schematic by the way. Not too complicated for the time.

 

[baeijsman]

It appears it's still possible to get hold of 'original' parts.
MJ15022/23, MPSA42/92, MPSU10/60 and 2N5566 are all available on eBay.

 

[Nelson Pass]

I may have a few also.

 

[exponent]

Thank you to everyone that replied. This information will be very helpful.

 

[exponent]

Thank you for the schematic on the Threshold S Series. I can read most of it pretty well but am having a problem with a transistor pair. Just before the stasis output pair there is a NPN-PNP pair that looks like 2N3440 and 2N3415 but that cant be right as 2N3415 is a NPN transistor. Can you verify what these two transistors are?

 

[Zen Mod]

3440 and 5415 were often used as complementary pair