GRUENSCH Reference Amplifiers and Speakers. Made in Germany. Poweramplifier, Linestage, Preamplifier, Phonostage, Loudspeaker, Time Coincident, Planar Magnetic Transducer, Stereo-, Endstufen, Vorverstärker, Vorstufe, Phonostufe, Phonovorverstärker, Phono