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 operational amplifier designed as a modern recreation of the API 2520 op-amp. It is offered both as a DIY kit and as a pre-built unit, targeting users interested in upgrading or building audio equipment with vintage-style discrete circuitry. The design uses a 10-transistor configuration featuring a transistor current source for the long-tailed pair, and incorporates New Old Stock transistors for authenticity and performance.
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 features a 10-transistor circuit with a transistor current source for the long-tailed pair, and uses New Old Stock transistors to maintain period-correct performance characteristics. The unit is available as the CA-0252-DIY kit, which includes all components needed to complete ten builds.
Market
The CA-0252 is available in both DIY kit and pre-built forms, with current market prices ranging from $49.75 to $55 USD. It is marketed as a high-quality discrete opamp suitable for applications such as WA-412 upgrades, and has received positive user feedback for its build quality and sonic character.
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