The Manley 120 Watt Monoblock employs a pair of Teslovak KT88S or the strong Russian 6550C output tubes which can be switched from TRIODE operation to ULTRA-LINEAR mode. This amplifier could also be custom-ordered with the original KT90.

A three position feedback selector switch is provided on the front panel: LOW: 6 dB. MEDIUM : 9 dB and HIGH :12 dB.

For more information about variable feedback, read Notes on Negative Feedback.




  • Vacuum tubes:
  • Output 2 x KT88S or KT90
  • Driver 1 x 7044 or 5687 
  • Input 1 x 5751
  • Output Power TRIODE: 65 Watts
  • Output Power UL: 120 Watts
  • Input sensitivity: 1V nominal
  • Input Impedance: 100 kOhm
  • Output load impedance: 5 Ohm
  • Freq. Response +-l dB: 10Hz-50KHz 
  • S/N ratio @100W: -91 dB
  • Power consumption: 120 Watts (idle)
  •   360 Watts (Full Power)
  • Factory set for 100V, 120V or 220-240VAC operation for original destination country's mains voltage.
  • Operating Mains Voltage changeable with power transformer re-wiring and fuse value change.
  • Mains Voltage Frequency: 
  • Dimensions: W=12", D=10", H=6"
  • Shipping weight: 27 lbs. each

Specifications subject to change because they just might.