KR AUDIO 5U4G RICCARDO KRON LIMITED SERIES
Technical highlights are:
- Use of Zirconium - as the coating for the anodes
- Improved structure support in the least vibrating glass points with double mica
- Ceramic bases
- Gold plated base pins
- Triple thickness glass
- Doubled cooling radiation surface for anode cooling
- Barium heaters that run colder and have better emission
- Closer tolerance matching
- 9th degree of vacuum for extended longevity
