Vintage Tube Amp

Marantz Model 5 Amplifier. Serial #’s: 2718, 2732. These amplifiers were restored as a pair in 2016 by AEA (Analog Engineering Associates) Audio Inc. The company founded by audio pioneer Ken Leonard. Full Gold Level restoration with power supply upgrade. Chassis hand polished and sealed. AC Line cords replaced. All coupling and bypass caps upgraded to modern” audiophile” polypropylene types. Power supply upgrade installed with 500% increase in capacity. High capacity surge suppressors added. Transformer blow-out protection added. NOS RCA 6BH6 driver tubes installed. Output tube bias supply filtering improved. Bias supply Selenium rectifier replaced with modern silicon type. Bias was critically adjusted using a spectrum analyzer to minimize odd-order harmonic content, especially minimizing the 5. The last pictures show the test report details the performance. NOTE: One of the Amps is missing an external oil can capacitor. Restoration was completed with a new capacitor placed internally. A near match of the capacitor is included and can be placed for aesthetics (see pictures). Tubes will all be removed and packed separately.

Missing 4 output tubes (6BM8). Has slight surface rust all over. Knob on left is not original. Weighs about 29 lbs before packing. Terminals in rear have separation – see pics. The screws that hold cover on were missing so I put 4 in, but not original. There may be some things I missed. See pictures as they are part of the description.