The root of the famous AudioValve amplifiers is the RKV - the very first invention by Helmut Becker in 1982 and is protected by patent No. DE 3200 517 in germany.

The basic output stage concept is founded on a conventional OTL principle circut. To find a circut and a harmonizing tube for high output current and very low resistance wars one challenge Mr.Becker has to master.

The second success he had was to realize high output power for nearly all different headphones and their impedances - between 32 to 2000 ohms. Mr.Becker found a tube used in the TV production called PCL 805 (18GV8). With this tube and a full - automatically bias regulator Mr.Becker developd a unique closed DC coupled servo regulator circut whitch guarantees a life long exellent rendering of music.

All tube tolenrances was eliminated by using old or new tubes. All in all this amplifier is so perfect in technical details that until today the circut is the same, now for 25 years.

tech. describtion:

• OTL - transformer outless tube amplifier
• double mono construction
• Alps volume control
• 1 pair 6,3 mm stereo jacket for headphones
• tubes: 4 * PCL 805 (PCL 85 or 18 GV 8 - german old TV "vertikal" ampl. tube )
• power output: each channel 3 watt SINUS,  ( between 100 to 400 ohm loads )  
• bandwide: 15 - 100 000 hz
• damping 3600 !
• distortion 0,002 % at 1 Watt-200 Ohm load
• max. output voltage 80V
• sens. 0dBm
• IC - fullautom. - controlled bias
• class - a
• power consumption min. 40 watt
• size 360*200*120 mm (d.w.h.)
• weight 6kg
• patent full automatic servo tube biasing