Germanium?

[Michael Zacherl]

> On 6 Feb 2019, at 04:38, Michael Zacherl <mubar05 at blauwurf.at> wrote:
> 
> 
>> On 5 Feb 2019, at 14:32, Tony Hardie-Bick <tony at entity.net> wrote:
>> 
>> On 05/02/2019 13:17, Michael Zacherl wrote:
>>> 
>>>> On 2 Feb 2019, at 16:58, Tony Hardie-Bick <tony at entity.net> wrote:
>>>> 
>>>> they're using silicon
>>>> transistors instead of germanium,
>>> 
>>> uhm, Tony, did I miss something? Germanium?
>> 
>> the original moog ladder filters used germanium transistors, iirc.
>> 
>> that gives them a lower Vbe of around ~ 0.4V?
>> 
>> this was mentioned by Uli Behringer, where he was discussing the
>> circuits in-depth (on a mailing list, iirc)
> 
> Tony, you got a source for this?
> The presumably oldest type I could find was TIS97.
> And the patent isn’t specific about the type and make of the transistors.

I did find this from 1965 

https://moogfoundation.org/wp-content/uploads/462.jpg

which uses an SFT337 germanium transistor.

Curious, curious … ;)  m.