[sdiy] Cooling in modular synths

John Speth johnspeth at yahoo.com
Mon Dec 27 14:37:46 CET 2021

 I have an original Prophet-5 (Curtis chips inside). It has a one-touch tuning button that works great. It always succeeded in tuning for me. So it was never difficult to tune my P5. It does drift as the system warms up after a cold start but it eventually stabilizes. Pressing the tune button again fixes tuning very well. One trick to get a fat P5 sound is to avoid tuning (and hope for the best).
I know all 10 VCOs were tuned. I don't know about the filters but I strongly doubt they were tuned (only important if the VCFs are set to self oscillate). VCOs are clearly the most temp sensitive components.
    On Sunday, December 26, 2021, 02:38:44 PM PST, Gordonjcp <gordonjcp at gjcp.net> wrote:  
 On Sun, Dec 26, 2021 at 08:49:19PM +0100, cheater cheater via Synth-diy wrote:
> Would you say current designs are less temp sensitive?
> What was the most temp sensitive part in things like a Jupiter 8,
> CS-80, or a Memorymoog? Or even an original Prophet-10? The last two
> especially are said to have been very difficult to keep in tune...

It's always going to be the expo converters, which is why they're hard to keep in tune.


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