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Re: No blue face lite
I am not familiar with your particular model, but Marantz used different bulb styles in different models. Some use fuise style others use soldered in types. You should be able to see the bulb type by removing the top cover. I'll research this a bit and update this.
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First off before you do it is a specific bulb custom sized. I cannot stress enough how important it is to use the correct bulbs for this application. If you go the cheapy way it will COST in the end. There is a reason for it. I recently had one someone brought in that used the incorrect bulbs and burned the blue to a horrible brown and blue away from the face as well as melted the face a little. Spend the extra and get the bulbs from McIntosh It was a three hundred dollar repair job. You will save by getting the correct bulbs and doing it yourself. I hope this helps pointing the way to save lots of later frustration.
You have either got a bad earth connection, or possibily there's a capacitor failed.
If you can't find a dodgy conection, I would replace the large Electrolytic Capacitors in the power section, they are used to take out 50hz hum in the mains electric, when they go you get that hum coming into your system.
Sounds like a problem with the coils. Coils are known to short-out during periods of high-use. This happens when the insulation between wires break down and allow for a path of lower resistance for the current to travel. If this is the problem, you'll have to replace the coils in the amp which is a weekend job, but completely do-able. Hope this helps
old type amps or meters uses sort of back lighting only. it's either peanut type bulb or fuse like bulb. dpending on the voltagew requirement too, you may check one of the meters still lites working and see the specs of the bulb. it should no te hard to replace. it also runs on AC supply so no worry of wrong connection.