DIY "Keeley"-TS9 mod questions

[thegnu]

No, they're not. 2SC1815's have the collector pin in the middle position:

http://www.datasheetcatalog.org/data...oshiba/964.pdf

MPSA18's are the same pinout as the 2N3904's, but much higher gain.

So, I remember one of them was a 2SC1815. Praise the lawd. So, what would be the practical difference between using MPSA18's and 2N3904's, because the legs on my reclaimed MPSA's are stubby, and I've got brand new 2N3904's sitting there.

[duhvoodooman***]

SoSo, what would be the practical difference between using MPSA18's and 2N3904's, because the legs on my reclaimed MPSA's are stubby, and I've got brand new 2N3904's sitting there.

The higher gain transistors will keep the buffer gain closer to unity. You may lose a few percent by going with a lower gain tranny. Shouldn't be a big deal.