[sdiy] ARP VCO drift

[Steve Carter]

I'd go with a transistor pair in a single package as Ray suggests but  
as they are a complementary pair there are fewer choices.  I heard  
about a BC847 (but haven't tried one yet) which is a 6 pin  
complementary pair in SMT form - solder on some wires and ride it  
piggy back on the Tempco and it maybe just the thing!
Steve

On 10 Aug 2008, at 11:49, rob wrote:

> he transistor pairs are not matched, but are in contact with the  
> Tempco.
> There is some improvement by getting this contact.
> The original ARP 2600 VCO's are of course encapsulated....
>
> Where am I going wrong?! Any ideas?