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Klaas Robers wrote:Harry, something comes in my mind again. In the 78 rpm-time the cutting needle was used only once, for one disc side. It weared off so much and so fast, that after one disc side it was replaced and discarded.
The tiny size of the cutting head i would believe that for sure ! i wonder what they used at the start just steel ?,i have not heard of that type of wear these days ..i will look into it but i would be very costly some cutting stylus are 80 dollars for one .. some are selling old cartridge's with cutter at crazy prices .
The metal ones you can get one with shipping for 30 dollars.That was the reason that when recording a grammophone record, the disc was recorded from the inner side and spiraling towards the outher side. At the inner side the groove on the disc runs slowest, so the cutting stylus should have the most optimal shape. During the recording process, the stylus weared off and the groove became more and more misformed. But there the groove speed became higher, so the misformation was causing less distortion.
That's some thing again i have never come across ...there was some science going into developing the record and formats ever come across a 16 RPM ? have that one old 50s player ....
Now i have to do my try's with junk laying around bit of repurposing .... the cutting or scratching the audio will be done on the cheap ..So when recording, record from the inner side, spiraling towards the rim of the disc. I have two of those discs, recorded discs. They were recorded in february 1945 here in Eindhoven, at Philips.
And yes, pressed and bought discs should be played starting at the rim and spiraling in, but that had a totally different reason.
Klaas Robers wrote:Harry, something comes in my mind again. In the 78 rpm-time the cutting needle was used only once, for one disc side. It weared off so much and so fast, that after one disc side it was replaced and discarded.
That was the reason that when recording a grammophone record, the disc was recorded from the inner side and spiraling towards the outher side. At the inner side the groove on the disc runs slowest, so the cutting stylus should have the most optimal shape. During the recording process, the stylus weared off and the groove became more and more misformed. But there the groove speed became higher, so the misformation was causing less distortion.
[/quote]So when recording, record from the inner side, spiraling towards the rim of the disc. I have two of those discs, recorded discs. They were recorded in february 1945 here in Eindhoven, at Philips.
And yes, pressed and bought discs should be played starting at the rim and spiraling in, but that had a totally different reason.
Harry Dalek wrote:That's some thing again i have never come across ...there was some science going into developing the record and formats ever come across a 16 RPM ? have that one old 50s player ....
Now i have to do my try's with junk laying around bit of repurposing .... the cutting or scratching the audio will be done on the cheap ..
Viewmaster wrote:Harry, it was 10 years ago so I cannot remember small detail.
But the upper freq response was never good. Bear in mind that I was
cutting wax Dictaphone cylinders. It is a very soft medium to work
with compared with the very hard CD surface you are working on.
So you are in a different ball game entirely, my freq response will
not bare compaarison with your CD's.
If you do sweep tests and look at results under a microscope
it is easy to work out your response knowing the inches per second of
your cutting speed.
As I cut on a cylinder I didn't have the speed variation that disc cutting has.
I hope that eventualy you are a cut above me!
Viewmaster wrote:You're lucky, Harry, in that on playback you have a hard surface to track over.
I had just hard wax to contend with so I had to use the lightest of pick ups
to prevent groove wear.
Your rig is looking good. What's the sync situation like now?
Harry Dalek wrote:i noticed was sync was off changing player speed didn't really help .
smeezekitty wrote:Most likely because there is quite a bit of frequency (speed) instability
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