[sdiy] Oberheim OB-Xa noise generator transistor

[Ian Fritz]

This again?  The noisiest transistors have the most popcorn and 1/f noise.  The ones with these smoothest white noise are very quiet. But whatever you like, of course.

Ian

> On Jul 13, 2018, at 2:09 PM, Gordonjcp <gordonjcp at gjcp.net> wrote:
> 
>> On Fri, Jul 13, 2018 at 03:38:37PM -0400, Eric Frampton wrote:
>> Hi all,
>> 
>> I’m working on an Xa whose noise generator transistor seems to have died. In the schemos it specifies a selected transistor, but doesn’t call out what the transistor is nor (of course) what the selection criteria was. Do y'all have any suggestions for how I might go about finding a suitable replacement?
> 
> Find one of the suitable "polarity" (NPN/PNP), try various ones until
> you find one that's shitty enough.
> 
> Even the shittiest £2-per-thousand BC548s from Far Cathay are still a
> bit too good for this job, so keep at it ;-)
> 
> -- 
> Gordonjcp
> 
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