Expo conv. heater (tomg et al.)

[Fraser, Colin J]

> -----Original Message-----
> From: Haible Juergen [mailto:Juergen.Haible at nbgm.siemens.de]
> Sent: 03 February 1999 11:46
> To: DIY; debus at cityweb.de
> Subject: AW: Expo conv. heater (tomg et al.)
> 
> 
> 	>You guys must be very happy with your discrete VCOs. 
> My 3340-based
> VCOs
> 	>need at least 20 minutes to warm up and get stable.
> 
> So does one of mine. When I turn on my modular, the SEM-style VCOs
> and one of the 3340's are in tune immediately, but the second 3340
> is out of tune by 50 cents or so. Its tuning will crawl in to 
> the right
> value
> over the next quarter of an hour, so if I am patient, I don't have to
> re-tune
> it at all.
> 
> The same for my OB-8. Some of the 3340's in there take some time,
> but if I'm waiting 10 minutes I don't need autotune at all. 
> If I decide to
> use autotune immediately after switching the OB-8 on, however, I
> will have to make more autotune runs over the next minutes, too.

Is this a specific problem with some 3340s or is it a problem with external
components in the oscillator, or possibly contamination of the board causing
leakage from the timing cap ?
Maybe it's fixable...

Colin f