MB81 SE vs EAR 509
The 509's signal-to-noise is 96 dB against the MB81 SE's 90 dB, its thd 0.500% against 0.200%, and its damping factor 20 against 5. Both share power @ 8ω (100W).
AI-generated product photo — not official manufacturer imagery.
MB81 SE
Icon AudioAmplifiersPower AmplifiersTube Amplifiers
Estimated price (community-sourced)
$18,971.40
Around — community and catalog average, updates slowly
About the MB81 SE
The Icon Audio MB81 SE is a high-power, single-ended-triode (SET) valve monoblock power amplifier built around the Russian GU81M transmitting valve. Sold as a stereo pair, each chassis is a hand-wired, pure Class-A monaural amplifier rated at 100 W into 8 ohms. It uses two 6SN7 valves in the input stage and a KT150 driver valve ahead of the GU81M output stage, includes Icon Audio’s built-in Easy Bias meter, tertiary-wound low-distortion output transformers, and gold-plated input/speaker terminals. Its unusually high output for a SET design is intended to make it usable with low- to medium-sensitivity loudspeakers and in medium to very large rooms.
Specifications
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 100W @ 8Ω
- Amplifier Class
- A
- Damping Factor
- 5
- Minimum Impedance
- 3Ω
- Input Sensitivity
- 0.4V RMS
- Input Impedance
- 100000Ω
- Max Input Voltage
- 28.3V RMS
Analog Output
Analog signal output specifications
- THD
- 0.200%
- SNR
- 90 dB
- Output Impedance
- 100Ω
Connectivity
Input and output connections
- Bluetooth
- No
- Wi-Fi
- No
- Ethernet
- No
- Analog Inputs
- RCA
- Analog Outputs
- RCA
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 315 × 685 × 385 mm (W × H × D)
- Weight
- 50 kg (110 lbs)
Key Specifications
Power: 100W
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions