Vintage Black Cat capacitor. Endangered, valuable. Tested with a tester and guitar, and the values are good. .05 400v Standard, popular value. Standard value for single-coil guitars, volts, optimal. Also suitable for other electronic components. Black Cat capacitors are high-quality film capacitors, famous and popular for their good sound. Cornell Series Compared to Sprague, Cornell has a wider range, extends to the high frequencies, and has a bright impression of good sound. Subjectively, I will describe the characteristics of each model. Black Cat: Standard bite, wide range down to the low frequencies, strong withered feel. Greenie: Similar to Black Cat, but with a slightly stronger bite and undulation. Blackie: Similar to Greenie, but with a slightly stronger bite and wild sound quality. Tiny Chief: Slightly less low-frequency range, strong undulation. Wild sound quality. Popular for heavy and punk genres. Maroon: Similar to Tiny Chief, but with a wider range and stronger undulation. Cub: Standard bite, similar to Black Beauty, but with a slightly brighter sound quality. It is characterized by a crisp, straightforward sound quality, unlike oil capacitors.