BC550B in a wah..

[ckim715]

So I was pretty set on trying out a BC109 in my wah, but I had to order some stuff from Mouser, so I thought I'd try a BC550B on a whim.

Short story, holy crap, am I glad I tried it out! When I swapped my standard inductor out for the red fasel, I was kind of disappointed; swapping out the MPSA18 to the BC550B made a HUGE difference! I highly recommend this mod to anyone who is looking to swap transistors.

Word of warning though, the pinout on the BC550B is EBC, while the MPSA18 is CBE.

[dbharris]

What are the hfe readings on the BC550B that you have in Q1 and Q2?

[ckim715]

I only swapped out Q1, and the HFE was around 450, iirc.

[Mark_McQ]

I swapped out my trannies recently too and it made a very noticeable difference. Really brought the red and yellow fasels to life. I went with BC190C's.
The stock trannies are rather 'meh'. I want to pick up another stock unit from eBay just to compare them now to see how big the difference is.

[dbharris]

Cool, I'm glad it worked out for u.