Harmon Kardon ST-7 Vintage Turntable, Serviced, With New Sumiko Cartridge

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Great vintage linear tracking turntable from HK. Super nice build with an all-aluminum chassis and metal parts throughout.

This sort of 'table would easily cost $5k and up to build these days.

Has an auto-lift feature to keep your stylus from unnecessary wear at the end of the record.

Built in strobe light lets you dial in the 33 and 45 RPM speed just perfectly.

I serviced the critical rubber wheel that the arm rides on in order to assure another 30 years of reliability, and performed basic service to the rest. It's working perfectly and ready for a new home. 

We will fit and calibrate a brand new Sumiko Blue Point No. 3 High Output MC (Moving-Coil) phono cartridge which is a great match. (High Output MC works with your regular MM phono stage).

If you'd like a different cartridge we're an official Sumiko dealer and can setup anything from their full lineup.

The SkyFi Testing Process for Turntables:

Fist we try to identify any mechanical issues, particularly in the tonearm bearings.  We check for freedom of movement or any resistance on both the horizontal and vertical range.  There is a quick test for this which involves placing the table on its front edge and allowing the arm to swing freely like a pendulum.  We then make any adjustments necessary to achieve minimal resistance and sometimes adjust the bearing pressure.  On gimbal tonearms we inspect the cone tip with a magnifier.  

We then asses the platter speed by using one of several methods, the most accuse is a playing a test tone on a test record and measuring the frequency out put with a frequency counter or oscilloscope.  We also utilize test equipment to measure the wow and flutter to ensure its within spec.  We do this for all speeds available for that particular model.  Adjustments are then made to achieve proper speed which will vary depending on table drive design.  Some require an adjustment of an internal or external potentiometer, some will require a pulley or motor adjustment.  We also inspect the platter bearing to ensure its properly lubricated keeping in mind that some don't require lubrication at all.

We then inspect the power supply and address any issues with overworked capacitors particularly on Linn and later Thorens machines which tend to need attention. 

On fully mechanical vintage tables like the Thorens TD124 and Garrard 301/401 we will go thought the entire mechanism, replace any worn parts and lubricate all components necessary to ensure smooth operation, speed change and low mechanical noise. 

When fitting a new cartridge we will go through our detailed calibration process which can involve as many as 12 steps depending on the arm design.  We perform this work on our custom turntable calibration rig which was developed in-house.  

Some of these steps include:

Pivot to spindle adjustment

Tracing force

Anti-skate

Tonearm height

Lifter height

VTA

Azimuth

Stylus Distance and Overhang

We then do a critical listening test using our test records and our test system to ensure proper sonics.