McIntosh MC-501 mono blocks (Pair)

We got these in on trade, they are in excellent condition cosmetically and sonically.  One of the amps has watt meter needle that needs to be calibrated or repaired.   all lights work and amps sound great.  ready for new home.   Description: Solid-state monoblock power amplifier with balanced (XLR) and single-ended (RCA) inputs and "Autoformer"-coupled output stage. Minimum sinewave continuous average power output: 500W into 8, 4, or 2 ohms (27dBW, 24dBW, 21dBW, respectively). Rated power bandwidth: 20Hz-20kHz. THD: 0.005% into 8, 4, or 2 ohms, 250mW to rated power output. IMD: 0.005% maximum if instantaneous peak output does not exceed twice the rated output for any combination of frequencies, 20Hz-20kHz, into 8, 4, or 2 ohms. Dynamic headroom: 1.8dB. Wideband damping factor: 100 at 8 ohms (equivalent to a source impedance of 0.08 ohms) Frequency responses: 20Hz-20kHz, +0/-0.25dB; 10Hz-100kHz, +0/-3dB. Sensitivity: 2.1V unbalanced input, 4.2V balanced input. Signal/noise ratio: 97dB, A-weighted (124dB below rated output), unbalanced and balanced. Input impedance: 10k ohms unbalanced, 20k ohms balanced.
Dimensions: 17.5" W by 9.5" H (including feet) by 14 7/8" D (including front-panel knobs). Weight: 91.5 lbs (41.6kg) net, 105.5 lbs
Read more at https://www.stereophile.com/content/mcintosh-mc501-monoblock-power-amplifier-specifications-0#uzwLJVAfQu2QBrXg.99