Superb Vintage Laney Supergroup MK1  1969 vintage 
100Watt Tube head 4xEL34 
All original and in excellent condition. We just serviced it, tube-changed and Bias adjusted, filtering capacitors all newly changed too ...great sounding amp! 
Circuit is close to a late 60’s Marshall plexi schematic with partridge transformers that are built like tanks 
Sounds like a Marshall Plexi but with a bit more gain! 
the early Black Sabbath Sound. 
They say  the Soupergroup has been born on request by  Tomi Iommy, who wanted the Plexi-Sound but refused to play Marshall amps