One-owner - excellent condition - McIntosh MC451 monoblock power amplifiers. They come with original boxes and manual. This amplifier is a gem of an amplifier due to its hybrid technology. 
 
Type: Hybrid Drive
150 Watts x 1-Channel Vacuum Tube Amplifier and 300 Watts x 1-Channel Solid State Amplifier
The ultimate solution for bi-amping loudspeakers
Vacuum tube section powers midranges and tweeters; Solid state section drives power hungry woofers
Autoformer™, Unity Coupled Circuit Output Transformer, Power Guard®, Sentry Monitor™, Monogrammed Heatsinks™, Solid Cinch™ speaker binding posts