Project sn 27520
Date received: 5/11/2016
Comes with a plinth from the original period:
The light upper platter and accessories
oem tonearm: ESL and armboard
Inspection:Chassis and paint
After clean with warm water and soap:
Detail close-ups; scratches and chips (below)
Under view (below)
Notes: One highly visible deep scratch covered with an accumulation of dirt and debris left to etch into the enamel finish. --Front to the right of the strobe window.--
Two rub-through areas along the back side. Chips in paint on the left side near the clutch lever. Wear-through near the speed control switch (common).
Clean-up procedure was to use soft cloths, soap and warm water. After this cleaning, the dirt is still stained deeply into the paint. A light pollish will clear much of that. However the exterior finish on this and most other TD124 chassis is not of a uniform thickness. Some areas have very thin coverage while being more normal (thicker) coverage in other areas. Extreme caution must be taken to avoid further rub-throughs as evidenced on the back side of this deck (received that way, btw).
This seems a good candidate for light touch up to the paint. I'll see about getting a color match to this chassis from local automotive body&paint suppliers.
Other notes: The bubble level was dry and non-functional. This will need replacement.
Parts list of needed replacements: (preliminary, to be added to as inspection continues)
E50 sn 48083
It is the differences in readings between coil 1 and 2 that we are looking for. Preferably, all comparisons would be closer than a 2 ohm difference
Should be: within 10% of factory spec 33 K-ohms
opening the motor casing:
Running clearance shaft to bushing: .0004 inches.
Rotor pollish process: 1) machine a sleeve out of nylon round rod .375 OD and .1875 Id. Slip the nylon ring over one shaft end, chuck it in the lathe, insert live center in the other end of the rotor shaft. Pollish with 1200 grit emery cloth. The 1200 grit is so fine that no measurable amount of material was removed from the shaft. We just have a uniform micro-smooth finish all over the rotor shaft.
Shaft diameter: Ø.1573"
bushing bores; bushing top: .1578, bushing lower: .1575
Bushing bore ID: varies as follows: top: .1985, middle: .1980, bottom: .1987
Shaft diameter: .1967 inches
running clearance: top: .0018, middle: .0013, bottom: .0020
Visually, the bushing bores show wear areas.
shaft to bushing run clearances:
disposition: replace bushings with new
bushing bore size with new bushing sleeves installed
into the steel housing:
Above photo: Platter with main bearing shaft attached. The Shaft has been lightly pollished using 1200# emory cloth. The bearing housing has its new bushings installed. A new gasket has been cut.
Bearing ball has been removed for inspection. Ball checks ok, though I have some new ones standing by should there be a need. (there isn't).
Brg Shaft dimensions after pollish: .5500 to .5497 (same as before pollish)
The new bearing shaft to bushing running clearances: .0017 - .0014
Idler wheel and its axle:
Pin diameter: .1968
idler wheel bore diameter: .1974
running clearance: .0006 inches. Very Good
Clean-up: Chassis and paint
Current status: waiting for replacement parts. In the meantime the chassis has been assembled partially for this photo shoot below. Note the new Jelco SA-750D is mounted to its new armboard and chassis.
Notes: Apart from the dirty and deeply scratched veneer surfaces, the plinth is sound and serviceable. Four heavy rubber feet have been installed. The external surfaces of the plinth have been cleaned and oiled.
Now....where are those parts? They were ordered two weeks ago and we're still waiting! I've been informed by the supplier that they were to have been in the mail on Thursday 6/26/2016. USPS priority mail. It's Saturday (5/28/2016). Wouldn't it be nice if they showed up in today's mail.
The replacement parts arrived 5/31/2016. The installation of the upgrade parts went normally. However when I was ready to test run the turntable I found that the motor was running very low on torque and did not carry pace very well at all. All variables checked normal except one.....the motor. A new E50 revision stator coil set was ordered from Audiosilente in Rome, Italy. Turnaround was fast. I had the coils on Tuesday. I'd placed the order the previous Friday!
Ohms check new coil set:
Very close resistance reads. With the new coils installed, and all previously replaced parts in their places, the initial power on resulted in a motor that came up to speed in one rpm!
The Jelco SA-750D tonearm is installed to its armboard. For testing one of my Denon DL-103R lomc cartridges is put to use. Installation to the headshell went uneventful. I drew and printed a custom arc protractor for this arm. It wants a Stevenson alignment with nulls at 60.325mm and 117.42mm. mounting distance: 214mm. Eff.Len.: 229. Setting overhang on this headshell went smooth, requiring scarcely any fiddling around to zero in on target. Nice machining Jelco! VTF was set to 2.2g using a digital scale. VTA/sra was eyeballed putting buttom edge of the ebony body parallel to record surface. A ballpark starting point. My exp on this cartridge for setting vta/sra is that with the conical tip there is some allowable tolerance in finding the sweet spot.
Sound quality is very good. Background noise is quite low. Quiet. The new mushrooms over an open box plinth can be a potent foundation for one slammy td124. This one seems so. The Jelco SA-750D does not get in the way of bass. I like it.
I'll spin vinyl on this one for the next day or more -- if I can get away with it -- 'lest the turntable's owner tells me to ship it back to him pronto so he can listen to it.