AI says:
You're right to point out that there isn't much information about "DuRoch capacitors" outside of PrimaLuna's own marketing and product descriptions. This strongly supports the idea that DuRoch isn't a widely available, off-the-shelf brand, but rather a custom-made component for PrimaLuna.
Here's why this is likely the case and why you won't find other mentions:
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"Made to our specifications": PrimaLuna explicitly states that these are "Premium tinfoil capacitors made to our specifications." This is a key phrase. It means they've contracted with a capacitor manufacturer to produce these specific capacitors based on their unique design requirements (material, size, capacitance, voltage, sonic characteristics, etc.).
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Proprietary Branding: They likely brand these custom capacitors "DuRoch" for their own products to emphasize the bespoke nature of their components and differentiate them. It's a way for PrimaLuna to highlight their attention to detail and sound quality.
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Supplier Secrecy: The actual manufacturer of these capacitors is almost certainly under a non-disclosure agreement with PrimaLuna. This is common practice in many industries, especially for custom-designed components, to protect trade secrets and intellectual property. The manufacturer wouldn't be allowed to sell "DuRoch" capacitors to anyone else or even disclose that they produce them for PrimaLuna.
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Focus on Performance, Not Origin: PrimaLuna's marketing focuses on the performance and quality of the DuRoch capacitors ("very expensive but the sonic results speak for themselves"), rather than the identity of the factory that produces them. For their customers, the "who" is less important than the "what it does."
In essence, "DuRoch" is a PrimaLuna-specific designation for a high-quality, custom-engineered tinfoil capacitor, not a publicly traded capacitor manufacturer. You'll continue to find mentions of them exclusively in relation to PrimaLuna's products.