noise of arrays

[Joachim Verghese]

On Tue, 23 Jan 1996, Don Tillman wrote:

>    substituting the 3086s for BC109s, but for some reason it didn't
>    work very well. I'm not sure, but I probably used BC109Cs, which
>    have a much higher beta than the 3086. 
> 
> Did you match the transistors?  I can imagine that the sound of this
> circuit might be suboptimal if the transistor pairs weren't matched.

I don't remember the details, but I think I used only two stages
for testing the BC109s, and I seem to recall that I matched them
(for Vbe, not for hfe). The whole thing was hastily built on copper 
strip board, so there's a great chance that something else went wrong. 

-joachim