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AmplifiersPower AmplifiersDiscontinued
Estimated price (community-sourced)
$6,999
Around — community and catalog average, updates slowly
About the MA1 Mk.II.2
The MA-1 Mk.II.2 is a pair of monoblock, output-transformerless power amplifiers using a fully balanced, differential, all-triode Class A circuit. Each chassis uses 14 6AS7G output tubes and four 6SN7GT driver tubes, with separate power supplies for the output sections. It accepts balanced XLR and single-ended RCA inputs and provides speaker outputs without an output transformer. Manufacturer specifications for this version list 150 watts into 8 ohms and 145 watts into 4 ohms; specifications can vary between revisions.
Specifications
Type: Monoblock power amplifier; output stage: output-transformerless (OTL), direct-coupled; circuit: fully balanced differential, all-triode Class A, zero negative feedback; rated output: 150 W into 8 Ω, 145 W into 4 Ω; inputs: balanced XLR and single-ended RCA; input impedance: 100 kΩ single-ended, 200 kΩ balanced; tube complement per chassis: 14 × 6AS7G output tubes, 4 × 6SN7GT driver tubes; power consumption: approximately 500 W per chassis; power bandwidth: 2 Hz–75 kHz within 0.5 dB (published Mk.II.2 review specification).