[sdiy] Doepfer's new vactrols?

[Mike Bryant]

In the technical notes on another site

"The 4 photo resistors and LEDs are assembled within an small lightproof box"
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From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Sean Ellis via Synth-diy <synth-diy at synth-diy.org>
Sent: 12 April 2026 15:51
To: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
Subject: [sdiy] Doepfer's new vactrols?

I was looking at the Doepfer quad slew module and noticed something odd, it doesn't have any VCAs and very few parts. It does have a giant black box that looks a lot like a regulator but it isn't, could it be a quad vactrol? I don't see any markings and the same unit appears on the Source of Uncertainty module in place of it's vactrol. Has anyone seen these or could they be custom jobs?
High res pictures here:
https://www.thomann.se/intl/doepfer_a_171_4.htm
https://www.thomann.se/intl/doepfer_a_149_3.htm
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