is there a substitution for this?

[electrichild]

Hello,
I would thank if someone can help me to substitute a component called 2sk44sp.
Found on:
http://www.sonicurbs.com/ibanezAD-80/ibanezad80.pdf
is IC105 near the external DC socket. What it do?

 

[wmtunate]

IC105 looks like a voltage regulator, which is MC78L12CP on that schematic.

 

[JohnRoberts]

Ah,  a cheapo companded bbd delay.

Yup.. IC105 is a 3 terminal VR

The 2sk44sp are probably the Nch JFETs Q104/105 forming an electronic audio switch.

I suspect there are several N ch devices that could work there, I would look for parts with similar gate pinch off voltage range, and suggest swapping both so they switch back and forth nicely together. 

JR

 

[volker]

In the Boss pedals 2SK30 are used for the same application.
They are still available.


Volker

 

[electrichild]

Thankx guys,
I'm thinking to do an analog delay because have 2 MN3005 + MN3001 for clock bbds, I wonder if someone can suggest other projects based on these chips or similar but still available.

 

[JohnRoberts]

I used to sell MN3001 chips through my kit company back in the '70s...  A flanger based on that old kit was used on Heart's "Barracuda" recording. 

That schematic you posted will get you a good start..  570 compander chip will improve S/N, but don't expect miracles. Especially at any kind of delay.

JR