[sdiy] expo pair "heat shield?"

[Michael E Caloroso]

I'm doubtful that a heat shield will be effective.  Active heat control
such as the ua726 was favored by designers since they first appeared in the
Musonic Sonic-5 (predecessor to the Moog Sonic-6).  A passive heat shield
would had been a cheaper solution in a price conscious industry, if it
truly had worked then we would had seen them long before now.

ARP encased their VCOs complete with the tempco resistor, so the epoxy and
silicon did not insulate the expo transistors from heat.

I have read of an experiment where a heat pipe from Edmund Scientific was
thermally connected to the VCOs in Garth Hudson's CS-80 to maintain each
VCO IC at the same temperature.  It did the job "subject to its
limitations" but it did not solve scaling errors due to temperature
changes.  Unfortunately that CS-80 was stolen while Garth was in NY and it
was never found.

MC

On Tue, Oct 11, 2022 at 1:27 AM Neil Harper via Synth-diy <
synth-diy at synth-diy.org> wrote:

> hey all,
>
> just wondering if anybody thinks it's worth encasing an exponential pair
> for stability. while this is in my modular case, there must be some heat
> currents moving around from the other stuff that share the same space.
>
> Maybe a dab of hot-glue-gun (hot snot), or a silicone or something?
>
> I'd hate for it to bite me in the arse in the future, maybe corroding
> the copper traces or the tin legs or becoming impossible to remove. What
> do the pros use?
>
>
> --
> /// Neil Harper
> /// Every Wave is New Until it Breaks
>
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