2sc2240 sub?

[runmikeyrun]

Trying to get a higher gain transistor into my DS-1 but i can't find any info on the web or in search.  I tried 2n5088 but i got a super low output.  I know it's lower gain but still...

any help?

[runmikeyrun]

no one? 

[cd]

I presume you observed the different pinout on the 2SC2240 and the 2N5088?

[R.G.]

Good advice, cd!

The 2N5088 is a high gain device. The two higher gain transistors that I might recommend are the 2N5089 and the MPSA18. But it would be very unusual that a 2N5088 would not replace any other transistor and be "low gain" if you didn't get the pinout or biasing wrong.

Check the pinout!

[runmikeyrun]

i thought i did.  Maybe i didn't or did something terribly wrong!  I know when i used my gain checker on my DMM the meter said 1 and lit up the little battery symbol.  Not sure what that's about!  I didn't get any reading when i flipped it around.  I'll have to get a datasheet and check it out.  Thanks guys for pointing out my stupidity!!     

[cd]

The 2SC2240 is ECB, the 2N5088 is EBC.  I don't remember that gain stage in the DS-1 exactly but IIRC put a 2N5088 in there and you'd have something like a common base amplifier (I think?) which would explain the very low output.

[runmikeyrun]

ah shit, well that makes perfect sense then!  I'll wire somethin up and see what I get.  I already lowered the emitter resistor on Q2 to get more gain out of the thing but too low and it just adds a ton of high end and hiss and likes to feedback.  And not good feedback, a really piercing one.  Maybe some new trannies are just the ticket.  Thanks for the info!!!

Mike