Self Repair of the cutting head

[alexsation]

Hi trolls!!!
Need your help. I have a cutter head (mono). This head was made in Russia, most likely it has no name and model number. The cutting head is not working, the coil burnt. I decided to reel new coil. Coil resistance could not measure, since all the turns were shorted. I counted the number of turns and measured the diameter of the wire. I bought a wire, coil rewound. The problem is that I got the coil resistance of 1.9 ohms. That's not all, on the reel left until much space, it was possible still squander, but I did not do that. Diameter of a wire of 0.2 mm. 70 turns. I believe that 1.9 ohms. it's very small resistance.
Advise, how I be?
I can try to make more turns to get at least 4 ohms. I also have a wire diameter of 0.3 mm. can be try it.
Together with a cutter head received 400 new stylus. They were made 40 years ago, most likely from artificial diamond, but maybe I'm wrong. Sharpening as in stylus 320 is not visually different, have used them for cutting plastic postcards.

[alexsation]

[dubcutter89]

Very nice

1,9 Ohm is not very much, but I think some of those old heads had very low resistance...
if you have an old transistor amp that is not a problem if you kill it you can try to cut with it..
or maybe you add as much windings as possible on the bobbin - should make a more sensitive head (good) plus raise the resistance (2xgood)

it looks like there is no dampening in the head?
also did you make a new magnet for it, or is it original?

I also have an old head needing a new coil - maybe I can measure the coil diameter and so for comparison...
btw, do might give away some of your styli?

Lukas

PS: How's your head suspension project going?

[alexsation]

Hi Lucas!!
I would be very grateful if you can measure the resistance of the cutting head and to write me. In an extreme case I will try to add of turns and bring to 4 ohms.
With the suspension I understood, but the depth control system I can not to do .
Stylus I wanted to sell, but I will not. I have another stereo head with wide landing, if the tail a little whittle away, the stylus fits.

[opcode66]

They are likely not diamonds. They are either clear sapphire or synthetic sapphire.

If they have burnishing facets, they are sapphire. Burnishing facets on a diamond are extremely expensive to have made.

I can roll you flat enameled wire. You can easily fit more turns in less space with flat wire... Let me know if you want some.

[alexsation]

Thank opcode66!
I will try to rewind a simple wire, if the result would bad, then I will try other options.
If I'm not mistaken sapphire cuts only lacquer. This stylus is cut plastic the blank, the former owner of the cutting head gave me the blanks for cutting. I'm not saying that it was a diamond, but there is hope, the other day I'll go to a jeweler familiar.

[opcode66]

You can emboss/impress plastic with sapphire. Turning the stylus 180 degrees so the back angle is facing into the material instead of the mirror surface allows you to put an indentation into plastic. A groove that will play. But, it will be shallow. So nothing loud or you'll have playback issues. Also, there will be a lot of background noise. There wont be any material coming off the disc as there is when you are cutting. So, no need for a vacuum. If you have a disc that was made with one of those styli, play it. If it has a lot of background noise, it was likely impressed not cut.

The other reason why I dont think those are diamonds is that the going price for one is about $300. That bag in your picture would represent a small fortune. Did you pay 5 to 10k for that bag of styli? If not, then they arent diamond. No one in their right mind would sell you a bag of diamonds for less than their value

[alexsation]

I totally agree with you, most likely it not valuable stone. I really want elucidate the potentialities these stylus. during recording not unwrapped stylus 180 degrees, it is installed flat side of. Stylus is not pressed the reverse side, namely cut record, I have the remnants of of thin filaments, therefore required a vacuum cleaner. Also, I got old recordings made ​​stylus, the sound is not clean and the background noise is present, but these records are gathered dust somewhere with a lathe for almost 40 years. In short, in practice all find out. former owner told me they had a studio, they recorded 200 postcards per day and stylus changing about once a week. But much time has passed since then, so that this information is probably not reliable.

[Jesus H Chrysler]

would you be interested in selling a couple of those needles?

[alexsation]

Probably I Will be ready to sell a few pieces, but a bit later. Before we take money from people, I am obliged to to give some guarantee, for example 10, 20, or 50 hours. If I'm going sale i will write it in our forum.

[piaptk]

Just because he didn't pay a small fortune for them doesn't mean they aren't diamond. The person selling them to him could have not realized how valuable they were.

However, they made MANY MANY MANY more clear sapphire styli than they did diamonds back in the day. And judging from those photos they look very old. Most newbies see clear sapphires and assume they are diamonds, but I don't think they have ever actually turned out to be.

An 8 ohm head puts out about 1.9 ohm on an ohmmeter...

[alexsation]

Hi Piaptk!
I was at the jeweler, he said that it is not a diamond, it is a synthetic sapphire. I am pleased and sapphires Cut by them I have not tried, but is they are made a qualitatively there is no doubt! They were made in the Soviet Union, it indicates the high quality.

[piaptk]

I'm not an expert on it, but I believe I read that the only diamond styli they made were for DMM on Neumann machines, which means none of them have Presto/Grampian style shanks.

Until recently, when Vinylium, The Shank, and Deep Grooves started making them for hobbyists, but that was so recently that they would be sold by someone who knew what they were.

[opcode66]

They also made diamond cutting styli for etching the original digital disc masters. Before a laser was used. I've learned much from the patent documents for such diamond cutting tools.

And, yes, DMM uses diamonds.

[charlief64]

Answering one of the initial questions. If you are going for 4 ohms impedance, a DC meter reading should be at least 2.7 ohms.
charlie