These are the latest discovery for audiophile applications with many users claiming a spacious airy sound when compared to the 5U4G The 5R4GY is a high voltage power rectifier and was designed for transmitter use. It has a rating of 180 Watts. The maximum reservoir capacitor is specified at 4 µF and the rectifier needs a series resistance of 250 Ω to limit peak current.
Indeed this lovely rectifier has found usage in such classic esoteric designs as:-
Cary CAD300SE Signature,
Emotive Audio Sira linestage
Woo Audio WA22
World Audio Design 300B PSE,
Here are a few vital statistics for you to match to your requirements.