Neumann WV2

“Neumann's WV2 is a legendary professional stereo phono equalizer amplifier introduced in 1958. In the audio world of the time, it was designed to achieve high-quality playback of stereo discs, and is so rare and highly valued among modern vintage audio enthusiasts that it is known as the "Holy Grail." 

Main Features and Background Development Objectives: Originally designed for monitoring such as the then standard record cutting system "Neumann AM32b". Circuit Configuration: Vacuum Tube Stereo MC Phono Equalizer A nickel-cadmium battery called "Stabilyt" was used as part of the circuit, and a unique design to stabilize the bias. 

Top-notch parts: the input trans is equipped with the famous BV33 (by Haufe), combined with professional vacuum tubes (e.g., EF804S, E80CC) made by Telefunken. Supported Standards: Not just RIAA, but also DIN and FLAT curves. Technical Specifications (Example of Original Version) Item Contents Used Vacuum Tube EF804S ×4, E80CC ×2 Input Trans BV33 (MC Raising Pressure Trans) Output Level Studio Standard +6dB (1.55V) Balance Output Size Approx. W520 × H100 × D310 mm (Individual Differences Available) Since Valuation in modern times is very rare to find it on the market and trade at extremely high prices in second hand market. 

There are also rebuild projects that try to replicate its legendary design, and replica/base models made by Hans van Vliet from the Netherlands. 

Used in conjunction with professional turntables of the time such as the EMT 927 and EMT 930, as well as Neumann DST cartridges, is considered one of the ultimate combinations for audio files. ”

Pictures courtesy of Takeshi Mikami-san, thanks.