Black Russian Variant - Muffin Fuzz

[chongmagic]

I went through the schematic and changed the values, could someone look and see if anything looks awry?

 

[chongmagic]

From what I can tell pretty much identical as the Green Russian on the build docs but using BC549C transistors.

 

[chongmagic]

Ok looking more thoroughly at the schematic it appears that the Green Russian uses a 100uf electrolytic at C14 while the Black Russian uses a 22uf electrolytic. I am guessing this is a power filtering cap? Is there any point to changing this from 100uF?

Also aren't 2N5088 transistors the US versions of BC549Cs? I know the pinout is flipped, I could socket those and try and see if there are any differences sonically.

Still building up my schematic chops, sorry for so many questions.

 

[benny_profane]

Ok looking more thoroughly at the schematic it appears that the Green Russian uses a 100uf electrolytic at C14 while the Black Russian uses a 22uf electrolytic. I am guessing this is a power filtering cap? Is there any point to changing this from 100uF?

It is a filtering cap. You could change it (I typically like to use a 100uF and 100nF in parallel), but the 22uF should be fine.

Also aren't 2N5088 transistors the US versions of BC549Cs? I know the pinout is flipped, I could socket those and try and see if there are any differences sonically.

Pretty much. The 2n5088 may run a bit hotter than the BC549C, though, which may have an impact on things. I like to use relatively low hFE transistors in the Russian BMP variants.

Socket them or breadboard to see if they make a difference to you. There’s a very real chance that you won’t appreciate a difference.

 

[chongmagic]

It is a filtering cap. You could change it (I typically like to use a 100uF and 100nF in parallel), but the 22uF should be fine.


Pretty much. The 2n5088 may run a bit hotter than the BC549C, though, which may have an impact on things. I like to use relatively low hFE transistors in the Russian BMP variants.

Socket them or breadboard to see if they make a difference to you. There’s a very real chance that you won’t appreciate a difference.

Will do, thank you Benny!