Search found 54 matches

by Wolfgang Felber
Fri May 10, 2019 12:33 am
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

Hi all, thank you for your kind comments, this certainly is a labour of love. These turntables are very serviceable unlike a lot of other stuff around. Build quality is pretty awesome. If maintained properly, I assume they should last forever. I have learnt so much in the last two years, that is how...
by Wolfgang Felber
Thu May 09, 2019 1:37 pm
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

Hi Nick,SUCCESS!!!!!!!!!!
Makes a few funny noises but it spins at 33, 45 and 78. I would say it needs adjusting. My coils gave me a total of 10.8 ohms, I hope that will not change things too much. Mate I am wrapped that I got it to this point. How can I ever thank you? You are a legend.
by Wolfgang Felber
Wed May 08, 2019 1:06 pm
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

Hi Nick, I managed to wind three coils, what a job. Three pieces of very very fine enamelled wire, 0.1mm in diameter and 1500mm long. I will put them back into the motor assembly tomorrow after the nail polish hardens properly. That is going to be a job as well. I will be wrapped if this does the jo...
by Wolfgang Felber
Wed May 01, 2019 12:34 pm
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

Hi Nick, OK pulled the coils out, it was the green ones that had shorted. There is 1460mm of extremely fine wire on the coils and blow me down, when I measured the DC resistance of the length of wire, I got 2.4 ohms. that times 3 will give me the 7.1-7.2 ohms you quoted for a healthy set of coils. A...
by Wolfgang Felber
Mon Apr 29, 2019 11:52 am
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

You make it sound so easy, the hard bit will be getting the former off the laminated steel to rewind it. I have had this motor apart once before and that is how I got it going, the frequency generator coil was broken at the end. I have ordered some 0.02mm insulated wire to do the job.
by Wolfgang Felber
Mon Apr 29, 2019 6:32 am
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

Hi Nick the new coils I am looking at making, they will have to be the same as the other coils, the green or the red . I don't know which one I have damaged. You quoted 7 ohms resistance on the three coils, do you know what the inductance would have to be, I assume the same as the other ones which I...
by Wolfgang Felber
Sun Apr 28, 2019 11:53 am
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

There is another option, this is a real labour of love, that would be to rewind those little coils, be a bloody hard job but worth it if you did it right.
by Wolfgang Felber
Sun Apr 28, 2019 11:46 am
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

Hi Nick, that does'nt sound good, what are my options here? apart from a new motor. As the song said, I really " " it up this time.
by Wolfgang Felber
Sun Apr 28, 2019 7:20 am
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

Hi Nick, OK I put a 50K signal from the frequency generator across C1 and C2. Connected the scope probe to PC and P3 and I got a signal, a bit dirty but still a signal. The signal was at 10 volts from the generator. I assume the 1 to 10 ratio on the T1 helps boost the voltage. I am trying to learn t...
by Wolfgang Felber
Sun Apr 28, 2019 5:56 am
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

Hi Nick, just a question, If I put the output of a signal generator at 50k across C1 and C2, I should get some voltage out of PC to P1 or 3. This will test the coils on the input side and tell me if I get something on the output. Correct? I am concerned that I may have damaged the very fine winding ...
by Wolfgang Felber
Sun Apr 28, 2019 5:11 am
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

Hi Nick,C1 to C2 = 1.2 ohms with 2.08uh PC to P1 = 9.1 ohms PC to P2 = 9.3 ohms PC to P3 = 9.4 ohms T1 that forms part of the oscillator circuit, does that have a 1 to 1 ratio or a 10 to ratio? the reason I ask is I looked at other oscillator coils for radios and they dont have a 1 to 1 ratio, they ...
by Wolfgang Felber
Sat Apr 27, 2019 2:56 pm
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

Hi Nick , are you taking about the coils in T1 or the coils in the motor, not the main coils, the 3 small coils at 120 degrees? If so, how do I test the tiny coils in the motor, just with DC resistance?
by Wolfgang Felber
Sat Apr 27, 2019 8:44 am
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

Hi Nick, trying to work out what is going wrong, I tested T1 for resistance, one side is 0.3 Ohms the other side is 2.1O ohms the coil was reading 62uh on one side and 622uH on the other side.
by Wolfgang Felber
Fri Apr 26, 2019 8:39 am
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

Hi Nick, tested C9 and C10, C10 was reading 8529pF and C9 was reading 9795pF. C18 was reading leaky in circuit with an ESR reading of 1.17ohms which looking at the book is OK. I will take it out of circuit.
by Wolfgang Felber
Fri Apr 26, 2019 7:31 am
Forum: General Vinyl
Topic: Technics Sp10 Woes
Replies: 77
Views: 7635

Re: Technics Sp10 Woes

Hi Nick , I used the probe on the C2 and the ground on the metal part of the turntable base. This is the bit that I am not sure of, to make an oscillator you need a capacitor and a inductor, does this mean the T28 amplifies the signal produced by the oscillator? I guess what I am saying is should I ...