Jelco Tonearms

Jelco has introduced a new tonearm to replace the SA-750 L 12 inch used on the PolyTable SUPER12. The New model is the TS-550L It is same tonearm with a few minor changes. A diferent balance weight to eliminate having two and black color only.

All SA-750 tonearms are discontinued.          

The Jelco arms are at the top of my favorite list.

The reasons:

The build quality is as good as it gets period.

Their adjustment capability is as comprehensive and easy as you can get. VTF, VTA/SRA, Anti-skating and azimuth with HS-25 or 30 headshell (supplyed with the TS-850 and 950 option with the TS-550). Many tonearms will not allow azimuth adjustment. This is most important for proper setup.  

  The Jelco tone arms VTA adjustment uses a simple to adjust locking collar, some tonearms use shims a very awkward and time consuming process.

 Fluid Damped Gimbal on the TS-550. 

If the Tri-Planar is out of your price range take a look at the Jelco.   

TS-550S damped $559.00  9 inch (mass 9.2 grams)

TS-550L damped $615.00  12 inch (mass 9.0 grams)

TK-850S Static Balanced  $$775.00 9 inch (mass 13.4)

TK-850L Static Balanced  $895.00 12 inch (mass 13.0)

TK-950S Dynamic Balanced $1050.00 9 inch (mass 13.4)

TK-950L Dynamic Balanced $1249.00 12 inch (mass 13.0)

 The tonearms do not include Cartridge or tonearm interconnect cable.Supplied with a headshell.

Tonearm effective mass is a complicated coculation using the moment of inertia            created by the total mass of all the arms moving components minus the cartridge.

HS-30 Rosewood/Magnesium headshell with Azimuth adjustment and silver litz wire is a great addition.

17 grams    $110.00

HS- 25 headshell $49.00

The master record cutting lathe moves in a stright line. Obviously the best method of recovering the groove information is to memic the lathe. A tangent tracking tonearm is expensive and extreamely fussy.

The reason older turntables (also todays less expensive) use 9 inch arms is: the overall size grows thus the cost and the turntable may not fit the average component rack.

The 12 inch radial arm is 3 inches longer than the 9 inch. This difference as shown in the diagram above (it may look like a small amount but when dealing in microns it is huge) relates to about 25% less tracking distortion. The longer the arm the shallower the arc.

One difference is the 12 inch arm's moment of inertia is slightly higher due to the extra length of the arm tube. But the arm tube is extremely light. The effective mass of the 12 inch is very close to the 9, the reason is effective mass is derived by a complicated equation that uses mass and inertia. If your turntable will accept a 12 inch arm the proformance difference will be very apparent. When you are ready to move to a 12 inch arm look at the PolyTable SUPER12 or the Merrill-Williams 101.3