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Thorens TD124 Serial no. 2729
Above: sn 2729 (sold) standing on its adjuster studs. Exterior finish is
nearly flawless. See next photos for a complete detail assessment of the
deck's cosmetic condition. The serial numbers were sequential. Lower
numbers indicate earlier production units. This one, I estimate, would
have been manufactured circa 1958 or 59.
Looking at the nameplate with serial number.
Refurbishment process and upgrades list:
|Complete disassembly and inspection of all components.|
|All parts were cleaned and lubed to insure smooth, correct operation.|
|rotating parts inspected and measured for evidence of wear.|
|Main platter bearing received new bushing sleeves (Oilite) in its housing.|
|Main platter bearing shaft, measured for wear and accepted. Micrometer
checks indicate lack of wear.|
|Main platter bearing shaft received a silicon nitride ceramic bearing ball
at its tip for the renewed thrust.|
|Main platter bearing thrust pad, replaced with a new Torlon
|A new Heavy Gunmetal bearing thrust cap replaces the original flexy cap.|
|E50 motor bushings replaced with new.|
|E50 motor thrust bearing pad replaced with a new Torlon
|MKII motor conversion kit (dual grommet) installed. I used parts
from Schopper in Switzerland for this part of it. The Schopper
grommets are of a new "poly" composition that last longer and
isolate better than the original rubber parts.|
|A new heavy gage power cord. |
|Electrical: The "pop" suppressor capacitor was replace with a
new one of the same original value.|
|A new (correct) replacement neon strobe bulb was
|The original idler wheel was replaced with a new wheel reproduced by Mirko.
This wheel featured new bushings and a slightly softer rubber composition
out at the perimeter where it drives.|
|The idler wheel thrust washer was examined for wear, found to be in good
condition and re-used.|
|Upper Platter condition: Straightened. Clutch operation is
correct. The platter spins without any rub. |
hint: click on thumbnail to view image full size.
Above: Mirko idler wheel. Machined from solid
bronze. New bushings. New rubber outer tire.
Adjustments and calibration:
The refurbishment of the TD124's E50 motor requires a multi-step process to
assure correct operation. The E50 in 2729 has received this very high
level of care.
E50 with mkII conversion kit.
Looking at the underside, while 2729 is fixtured in its service jig. In this view the Gunmetal bearing bottom cap is prominent.
Gunmetal Bronze Main Bearing Cap: I had a dozen of these machined by a local tool maker. I sold most of
those but kept enough for the turntables in my possession. 2729 has one, of course.
2729 in the service jig and with the upper platter shell and original heavy rubber
platter mat. Note about the mat; It is still quite supple and with no
evidence of wear.
The original rubber pucks on the Iron flywheel have been replaced with silicone
gel pads. I tried these as an experiment. It is a good
upgrade. I chose to keep these on the flywheel and will install them on
future refurbish projects for the TD124. The result was a slight but
noticeable improvement in background silence.
Looking at the underside of the iron flywheel and the main bearing shaft.
And under the hood.
Above two photos. Measuring the platter bearing shaft for evidence of
wear with a precision micrometer.
A silicon Nitride Ceramic bearing ball is installed at the thrust end. A
dab of bearing grease is used to retain the bearing ball during assembly.
20 wt. turbine oil is used to lube the shaft and bushings within the
housing. I use an oil formula that is the modern equivalent to that which
was advised in the TD124 service manual. I will include a small bottle
(with needle applicator) within the package as part of the deal.
The original nylon sleeve bushings were removed and replaced by Oilite bronze bushing
sleeves. Thorens went to the Oilite bushing sleeves later in the
production cycle of the TD124. For good reason; the Oilite bushings impart
little if any wear onto the shaft, and they last long.
After assembly I check that correct operating clearance between shaft and
bushing exist in the following manner:
If it rocks more than .001 inches, that's a bit too much bushing to shaft
flywheel must spin down free for a long, long, long time. This unit
operates within these limits.
And I also check flywheel for run-out while spinning in its bearing using the
same dial indicator. This one reads extremely close.
Further notes on Motor maintenance: E50
I had a couple dozen Oilite bronze motor shaft bushings machined by a local
toolmaker. 2729 has a pair of from this lot. They were installed
during the refurbishment process Over the years I have opened the motor
case to examine for evidence of wear. The rotating parts and bushings are
holding up well. And operating correctly.
All bushings manufactured for me are measured 100% for compliance to dimensional
limits. As the photos indicate, I use proper gages for this type of work.