Serial number of the product, and the seller’s name and address. For employees: install the follow-me printer online. To obtain an RMA number and assistance on where to return the product, contact Marantz Pro customer service at 401-658-5766. Upon receipt, Marantz Pro will repair or replace the defective products. Marantz Pro may, at Marantz Pro’s sole option, use rebuilt, reconditioned. MODEL 8 Serial Numbers These are the last serial numbers for each year of production for the Model 8 Year – Serial – Total.

Marantz Serial Number Lookup

Marantz Serial Number

Typical Problems Due to Component Degradation
Specific to Marantz 16 and 16B
Most of the typical problems that occur with the Marantz 16 and the Marantz 16B amps are due to component degradation. The speaker relay goes into protection prematurely, long before it should or at lower power levels. Upon turn-on, the relay energizes early or late. Other problems are: poor frequency response, high IM and THD, noise, early clip, high offset, parasitic oscillations, insufficient bias, bias fluctuations, and insufficient cooling due to dirt build-up.
Open and leaky capacitors are often found, as well as, zener diode failure, out of tolerance resistors (as much as 100% or more), and loss of chassis grounds. This ground loss is due to anodizing of the screw holes from the factory. So far, I've never seen a Marantz 16 or 16B without some of the carbon composition resistors out of tolerance.
Other common problems are: dirty pots, excessive build-up of dirt around the predrivers (these transistors are running close to their maximum dissipation), dirty relay contacts (silver sulfate), and solder connections that have become weak due to the high temperature of a few resistors on the TO-3 boards. Rarely are the silver micas, polyester, or mylar caps found to be defective. However, these will be checked, and replaced if found defective. A few 16s have had loose transformer bolts. And, in one case where the nuts actually fell off.