CAPI CA-0252
A discrete operational amplifier in the API 2520 footprint, available as a DIY kit or built unit
Overview
The CAPI CA-0252 is a discrete op-amp modeled on the API 2520. You can get it as a DIY kit or pre-built. It is aimed at people who want to upgrade or build audio gear with vintage-style discrete circuitry. The design uses 10 transistors, with a transistor current source for the long-tailed pair. The transistors are New Old Stock.
Specifications
| Product type | Discrete operational amplifier (op-amp) |
| Footprint | API 2520 footprint |
| Terminal pins | Longer terminal pins |
| Circuit design | 10 transistor circuit with a transistor current source for the long-tailed pair |
Design
The CA-0252 is a vintage 2520-style discrete opamp built to replicate the original API 2520 design. It has a 10-transistor circuit with a transistor current source for the long-tailed pair, and New Old Stock transistors to keep the performance period-correct. The kit is the CA-0252-DIY, and it includes all the components for ten builds.
Market
The CA-0252 comes as a DIY kit or pre-built, with current market prices from $49.75 to $55 USD. It is marketed as a high-quality discrete opamp for jobs like WA-412 upgrades. Users have given positive feedback on its build quality and sonic character.
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