Allen & Heath 6X2 MiniMixer MK2 1974 Vintage British ANALOG discrete transistor circuit Summing

British 6X2 Summing Mixer-made in the UK
Allen & Heath Black Range Minimixer MK2 6x2
made in 1974
100% Analog Discrete Transistor circuit / no IC chips
3 Band British Equalization Cue [Headphone Send] Echo [EFX send] Stereo efx return w/ EQ
44 years old.RCA connectors - Very Heavy Metal Case
True 70's British Class A sound.
needs a 21volt dc supply [not included] / it worked [passed audio]
w/ a Guitar Pedal supply.

dot com/ahproducts/black-range-2
allen-heath . com/media/Black-Range-Mini-Mixer-Six-Into-Two-Block-Diagram.pdf