Marantz Model 6300 Turntable Service & Overview

It really is a privilege being entrusted to care for such an amazing range of hi-fi gear, brought to Liquid Audio for service and repair. Every so often though, I work on a piece that really makes me smile. The Marantz Model 6300 direct-drive turntable is one of those pieces.

One look at a 6300 and you’ll reach an inevitable conclusion – that you want and need to find one to add to your collection. That’s exactly what happened with the owner of this very pretty unit. Surely, the Marantz Model 6300 is one of the best looking turntables from the entire 1970’s.

It features some of the classic styling elements so typical of Marantz equipment from this era, including the Marantz font, mixed wood and metal finishing and elaborate feature designation on the front fascia.

More Information

The Marantz Model 6300 is a direct-drive deck, with moderate specs, not high-end, but certainly no slouch. In terms of other brand decks, I put the Model 6300 on a par with the Kenwood KD-500 / 550, Rotel RP-3000, Denon DP-30L, JVC QL-F4, and others.

The Vintage Knob has more information on the Marantz Model 6300. Another good source of information is Classic-Audio’s Model 6300 page.  Also check out the short video I made about the Marantz Model 6300. Finally, Vinyl Engine has more, and is the source of the specifications, below.

Model 6300 Specifications:

Tonearm: S-shaped
Effective length: 231mm
Overhang: 15mm
Stylus pressure: 0.5 to 4.0g
Motor: Servo controlled direct drive
Speeds: 33.33 and 45rpm
Speed control: +-3%
Rumble: -60dB
Wow and flutter: 0.04%
Platter: 31cm
Platter weight: 1.6kg
Dimensions: 435 x 180 x 381mm
Weight: 10.0kg

Proper Turntable Service

This unit belongs customer who wanted her properly serviced and set-up. Sadly, and all too often, decks come to me poorly set-up, even after having been to other repairers.

A Liquid Audio turntable service involves a thorough cleaning of the lid, chassis, platter, mat, tonearm, stylus and headshell. I also clean and lubricate all deck mechanics, motor / spindle bearing, switches and controls, hinges, accurately set cartridge alignment, azimuth, tracking force and anti-skate.

Naturally, I also assess the correctness of the match between tonearm, cartridge and headshell. In this case advised the owner that he should also consider adding a better cartridge and headshell, but at this stage he just wanted her serviced.

Obviously, there’s much more to a turntable service than cleaning the stylus and checking the tracking force as some less than honorable repairers call a service, so beware!

Let’s step through this process, in pictures, starting with:

The Chassis

I love the look of the Marantz Model 6300. I think the combination of walnut veneer and brushed aluminium works incredibly well.

The Marantz Model 6300, as she came to me, prior to cleaning or any other work. Note the roll of paper in the background. Contrary to its appearance, this is not a roll of toilet paper! It’s actually a high-quality lint-free paper towel I use when cleaning and servicing hi-fi equipment.
Here I’m getting ready to pull the old girl to bits. The lid, mat, platter, headshell and covers all come off as part of a proper Liquid Audio service.
The tone-arm bearings of this 6300 needed a little attention. Here, I’m using a precision German Wiha screwdriver to make small adjustments to the horizontal bearing free-play. Ill-fitting screwdrivers will make a mess of these bearing adjustment screws. Note the anti-skate mechanism. I like this arrangement, where a weight pivoting on a shaft acts against a rod. No nylon monofilament thread to get tangled, or break.
The 6300 stripped and ready for an intensive chassis clean and further work.
Platter, mat and headshell to one side, they receive individual cleaning / adjustment.
The special foaming cleanser I use, or any good cleanser, helps to remove accumulated dirt and oils, built up over the years.
The Motor

The Model 6300 motor appears similar to those used in many other decks from this era. In this case, it may be shared amongst other models and appears to have been slightly hobbled for this deck. A closer look shows only two of its possible four wiring phases are wound with wire, and two additional poles are missing. Whether all four poles/phases were present in other versions of this motor, I don’t know.

Once the chassis and surrounds are clean, it’s safe to have a closer look at, and service, the bearing. I’m holding the rotor, stator is visible in the background.
The rotor from a different angle. Note the largely unblemished bearing surface, and the recessed, roughened mid-section, that holds some of the bearing lubricant. It’s important to insure this section is adequately lubricated before reassembling the motor.
A better view of the motor, minus the rotor. Centermost is the bronze bearing insert. This is often referred to as ‘oilite’ material and is impregnated with oil from the factory. It’s typically supposed to be maintenance-free, though I doubt Marantz or anyone else figured that great decks like these would still be working 40+ years later. Therefore I always clean and apply oil.
Close-up of the stator and bearing sections of the motor. Note the Teflon thrust pad at the bottom of the bearing well. I carefully cleaned this with lint-free materials to insure a free-running, and therefore quiet, bearing. Note also that Marantz has wired the motor up with only two of the four possible winding phases – green and gold. There are two additional and unpopulated set of poles and a winding phases, left out presumably to save some money in this model.
I’ve included these shots though to show that Maratz were still working to some excellent tolerances. Note that both the rotor and stators are sized for correct fit, with the grade printed on rotor and stator, in the form of two ‘+3’ markings in this case. These were hand-matched to a particular tolerance grade at the factory.
Correct rotor for this stator/motor, based on production tolerance testing. See if you can find this attention to detail in modern Chinese turntables. Anyway, the bearing is now clean and contains the correct amount of synthetic bearing oil.
The Electronics & Mechanics

I really like the physical layout this deck. Even the parts you can’t easily see underneath are thoughtfully laid out and trimmed.

The layout of the Model 6300 is extremely neat. Bottom left is the power supply filtering and regulation, plus the mechanical arm position switching and speed controls. Top left you’ll notice a couple of solenoids and other arm controls. A small transformer is located to the top right, with motor in the middle.
Master speed controls, on the bottom plastic cap the motor.
Two diode bridges, some good quality and decently sized capacitors, a series pass regulator transistor and miscellaneous other parts from the 6300 power supply.
Microswitches, levers, pivots, potentiometers. Everything here needs attention. I cleaned and lubricated everything you see here, as part of the comprehensive service this deck received. Note the thickness of the high-density particle board plinth/chassis.
The Finished, Serviced Model 6300

I was sad to say goodbye to this gorgeous deck, but her owner is very happy and after service and a precision set-up, she played a record more quietly and with lower wow & flutter.

Ready for her first power-up, post service. Still some arm adjustments to complete.
This Marantz Model 6300 now looks a million bucks and is ready for her final arm set-up and test.
I lightly oiled the wood veneer after cleaning. Hopefully that shows up here.
The name badge as it originally came to me.
Nice clean name badge!
And the tone-arm pivot assembly before proper cleaning…
And after cleaning, a big improvement. Last thing to do here is to finish set-up of the arm lifter, which needs a positional adjustment. Otherwise, the job is complete!

I hope you’ve enjoyed this look at and service overview of the Marantz Model 6300 direct-drive turntable. Don’t forget, Liquid Audio is a turntable specialist. Get in touch with me for all your turntable service and repair needs and to book in some turntable TLC for your deck!

2 thoughts on “Marantz Model 6300 Turntable Service & Overview”

  1. Stellar work as always sir!
    You make me wish I had pursued a career in electronics in my youth.

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