Pro-Ject Tube Box E Phono Pre-amplifierInnovative miniature sized phono preamplifier with tube output! Tube Box E finally enriches our E line with our highly popular tube phono preamplifiers. It features a fully discrete circuit design without using any operational amplifiers (OpAmps). This results not only in fantastic low noise phono amplification with clean measurements and accurate RIAA equalisation, but also ensures a long product life cycle as maintenance, service and repair are