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Enter my first turntable restoration. I'm excited; but a complete noob, don't know where to start. Looking forward to importing my motorcycle tinkering to a turntable, but I can't tell an RCA from a power cable, basically. Attached image of the underside of the TD147; I bought as-is from fleabay, no extra cables. I'd like to solder in two RCA plugs into the back to hook up a Cambridge pre-amp. Two things:
1. Advice on cables inside and the RCA plugs to the outside...good ones to install
2. Once I install the plugs into the wood base, where do the cables/wires get soldered into? I have little idea what I'm looking at here
I've done resrach online, but it seems at least most people know where an RCA cables solders into. Right now I can only see two black wires, one of which leads to the rpm switch, turns green, then back into the plug that goes into the circuit board, joining the other black one...
I appreciate the help - A green question, nonetheless, have to start somewhere. I can't yet hook up the system, and the motor needs a clean (took it apart already, it's out of the photo). Thanks!
Follow Ups:
Where did you get the plastic mount plate with 3 holes (2 RCA + Ground)?
Here's an easy method to reconfigure an inexpensive surface-mount binding post terminal in order to use it for a stereo pair of rca jacks affixed to the back panel of the Thorens turntable. Two small holes drilled for the mounting screws, and two modest diameter holes drilled through the turntable back panel for the back-end of the rca jacks is all that is required in order to install a pair of rca jacks that don't require a large entry point in order to wire them.
The plastic plate of the Parts Express #260-302 surface-mount binding post terminal is of high quality, and the two binding posts that are mounted on it can be easily removed and replaced with a pair of rca jacks that don't require a large entry point in order to wire them. The holes for the jacks through the plastic plate will likely need to be enlarged with a drill bit.
Parts Express Gold Plated Banana 5-Way Speaker Wire Binding Post Terminal:
http://www.parts-express.com/parts-express-gold-plated-banana-5-way-speaker-wire-binding-post-terminal--260-302
The Parts Express #091-1120 chassis mount rca jack design is an appropriate design to use with the plastic terminal plate, however it is a mundane product that could be bettered by choosing an audiophile make/model.
Parts Express Chassis Mount RCA Jack Pair:
http://www.parts-express.com/parts-express-chassis-mount-rca-jack-pair--091-1120
The image on the left shows Canare L-2B2AT foil shielded twisted pair cable implemented as highly flexible thin profile phono-level hookup wire.
http://www.canare.com/ProductItemDisplay.aspx?productItemID=59
The red lettering of the right image indicates the wiring scheme from top to bottom: L-, L+, G, R+, R-
The bottom image shows rca jacks and a ground wire binding post mounted on a plastic plate affixed to the back panel.
Did you make the RCA plug plate yourself?
I received the Canare wire yesterday; I tied the two ground wires inside the cable together and soldered them onto the G terminal. I see in this photo, however, that you have a third cable soldered to the ground? How does that work?
That's an understandable mistake. The "third cable" you indicate is actually an 18 AWG ground wire that is separate from the phono cables. The bare wires within the phono cables you mistakenly connected to the G terminal are drain wires for the foil shields. The drain wires should not be connected to any of the terminals at that end of the phono cable hookup wire. The drain wire should be connected along with the white wire (negative wire) as shown in the photo to the ground of the rca jacks you will install.
A ground wire needs to be connected to a ground post which should be located on the back of your phono preamp, preamp, or integrated amplifier, whichever unit has the phono inputs you will plug the phono cables into.
You can run a ground wire to a binding post installed at the back of the TT as shown in the photo, then connect an external ground wire from the back of the TT to a ground post of the unit you will plug the phono cables into (phono inputs). Or, simply run a non-detachable ground wire connected from the G terminal directly to the ground post of whichever unit has the phono inputs you will plug the phono cables into.
Any 18 AWG stranded wire such as available from a hardware store will suffice for use as a ground wire.
Thanks, those shielded microphone wires are nice, found some for $0.31/ft. As an aside question, what's the best strategy to minimize interference from AC line?
Canare L-2B2AT is actually intended as hookup wire rather than microphone cable. Connect the drain wire for the foil shield to the rca jack only (don't connect it at the tonearm end).
To help minimize interference from the AC line, keep the power cord well away from the phono-level cable. Furthermore, an IEC inlet can also be mounted on the back panel, well away from the rca jacks, using a tightly twisted pair of flexible stranded hookup wire. A dual-shielded (braided shield + foil shield) power cord can be plugged into the IEC inlet for a potentially lowered noise floor. YMMV
Thanks for this, very clear. Why do I have the power cable soldered into these connectors, and what do I do with the power supply in this case?
If possible, please post a high resolution close-up of the area shown in this cropped image of what you posted.
This is what I have going on. AC power cord in the L-, L+, R+, R- terminals, with thing ground wire in G. Don't know why it's soldered in there.
Sorry, wrong photo.
And a close-up of where the {what would be] phono cables taped into a power cord.
What is the black object the red arrow is pointing at?
That's the power cord in the field of vision that was spliced onto the phono cables. I tied it up later for the zoom out photo.
Next issue is you need to find out where the power cord is actually connected to the TT motor...
I take it it's from the 16v supply, which then ends up as green+black wire into the connector on the circuit board labeled 'B'...then the output to the motor from the four cables, blue red and black. I took the motor out to oil. No adapter came with the TT, I was considering a pro-ject speedbox to supply the 16v out.
Question, what is the black clip in the top left of the circuit board that holds the metal plate on the underside of the tonearm assembly (labeled D105 D109)?
I have a TD160, so I'm not familiar with any outboard PSU for a Thorens TT. Sorry, I don't know what the clip is for.
Thank you, you've been a huge help. I think my order of operation will be as follows:
-solder on shielded wire to the RCA connections, install RCA females and ground
-16v power supply (after researching, about $30 for replacement adapter on the td147; I saw a pro-ject speedbox sell on ebay for $75 the other day, I might as well save up for that, especially since it has a 16v out)
-new cartridge (at under $90, either shure M97XE or a Grado)
I hope that will get me going, at least. I'll tweak the tonearm later. Any other suggestions on how to make this into a great table are welcome.
Nice photo. The AC cord is connected somewhere else.
Two phono audio cables and a ground wire are connected to the terminal strip shown in the photo, not the AC cord.
Please take a clear photo of all cables/cords coming out of the back of the turntable, shown together within one image.
Normally, except the cable was cut and then attached to a power cord (I will attach a close-up photo, where the electrical tape is). I tied the power cord together, but it definitely has taken the place of the phono cables. That white cable that is attached also with electrical tape connects to the G terminal.
I have no clue what was going on here. I hope nothing is damaged, but I don't see how a current could have gone through this.
If I were to remove this and attach the Canare, would I go about by resoldering the Canare wires to the terminals, instead of undoing the power cord splice and attaching wires there?
If the phono cables were cut and the wiring were attached to a power cord that was then plugged into an AC outlet, doing so certainly might have damaged the wiring and fried the phono cartridge if it was connected to the tonearm headshell at the time. If there was no phono cartridge connected to the tonearm as of then, you might be in luck as far as damage is concerned.
Bummer - very bizarre. How would I find out if the wires were possibly damaged? I was going to replace the cartridge, anyway, but I hope there is no other damage.
As for the Canare - should I simply resolder those onto the phono terminals?
Images I posted in this thread show the proper wiring scheme for the phono cables and ground wire.
This is what I have going on. AC power cord in the L-, L+, R+, R- terminals, with thing ground wire in G. Don't know why it's soldered in there.
One more close-up
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