The Secret Society of Lathe Trolls

wow! well done!

https://www.lathetrolls.com/viewtopic.php?f=1&t=4635&p=28390&hilit=+50hz#p28390 Hello, Here's how I adapted my Rek-o-kut (not a 6n but maybe it helps) . Everybody seems more inclined for complex electronic means for frrquency comversion, so maybe you should cobsider that too? All I can say is that m...

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3- I think this blocks have no other pourpose than holding the parts together, but I may be wrong.... I've seen drawings of magnetic cutters with shortening rings to avoid alternating flux to run through the (Alnico?) magnets. Neos have not this problem.Neodymiun is like a "magnetic dictator" no oth...

2- The springs have to be very stiff, you can hardly deflect the armature with your fingers, Thats why the "magnetic" cutters are called "inneficient". It has to be so, as the resonance has to be high, around 8 khz in a Presto. To easily check what the resonance is, you can connect the coils to the ...

About the weigth, is not only how much, but also how far from the axis of rotation is the mass located. In the Presto 1x armature block, the "huge"stylus screw and middle part, don't contribute that much as the far sides, even the stylus tip does. Thats why an aluminium shank is a must. I can weigth...

Hello,
1- yes, the coils will buzz if not properly anchored by a "perfect fit" of the bobbin, or may be glue or alike. They also have tendence to shrink when energized. but this is not serious if they are tighly packed.

On my embossed records, I stick the label "not suitable for audiophiles". If one plays this record by accident, he or she can die instantly... ☺

WOW!

PM sent!

http://www.extra.research.philips.com/hera/people/aarts/_Philips%20Bound%20Archive/Binders/
The directoty I found is not the same but seems to lead to tbe same contents

Yes, a lot of info about tubes too...
I selected the most relevant about disc recording. (And sneaked one CD like, sorry), but may be I missed something....like this note...

Thats all folks!
Have you ever wonder how records are made?
...have a look!

Video lp...

Motional feedback for loudspeakers...

...Microgrooves are comming!

...How did they fabricated playback stylii...

You're wellcome!

... about ligth pattern test on stereo records...

... and this is a mechanical recording for optical playback by the same person!....

Mark,maybe is the same Miller, this looks like the Fairchild...