C50 pre-amplifier and A50 power amplifier pair by Cambridge Audio circa 1983 - extremely high quality. Beats the heck out of the current range of amplifiers
Preamplifier Specifications

Frequency response: 20Hz to 40kHz
MC input sensitivity = 500µV
MM input sensitivity = 3.2mV,
300mV (line)
Signal to noise ratio: 98dB (line)
Output: 300mV (line), 1V (Pre out)
Weight 11.2kgs
 
Power amplifier Specifications 

Output = 50 Watts into 8 Ohms 
Freq Response = 20Hz to 25Khz 
Input Sensitivity = 0dBV  (1v)
THD = 0.02%
S/N ratio = >98dB 
Weight 12 kgs