The Reu-o-Grande is a Marhall JCM800 2203 - 100 watt tube amp, tuned by Thomas Reussenzehn in 1986....the amp is not only a pleasure for the eyes, it is a rock machine merciless with 2 channels and an effects loop.
(The JCM800 head was developed from the legendary 100 watt "Plexi" head, an all-valve sound monster served at "11"
Pure Marshall sound: the 2203 model is considered as the best JCM800 amp 
The 100-watt master volume head was the heart of the series and still remains the #1 sonic benchmark today when it comes to honest, open and ruthlessly harmonic-rich lead sound.
Technical characteristics :
  - Type: Head
  - Power (RMS): 100 watts
  - Channels: 2
  - Pre-amp Valves: 3 X ECC83
  - Power amp valves: 4 X EL34
  - Dimensions (mm): 750 x 310 x 210
  - Weight (kg): 20.5 Kg
  - 3-band EQ
  - Effects loop
Thomas Reussenzehn tube history number:
1980
"Invention" of Marshall Tuning for Rodgau Monotones- sparked a huge boom, half the stage was playing Reu- Marshall tuned in Germany from Bap to Tote Hosen.