The Secret Society of Lathe Trolls

These images are from active ebay auctions for 78 rpm acetates:





Notice the root beer color - like 'safety film' ...

- Fr. José

Cool article. Only, shellac was never a mastering material (; Also, I would describe the copper disk as a directly-cut 'mother' which is used to make a 'son'. Same (reduced) number of steps as they cite, but they're not really making a 'father' because that more difficult step is made from a silvere...

Yes, interesting development. Where are they getting their amorphous copper blanks?

Is there another scenario? The groove's center line reflection appears to be flattened only at the deepest (i.e., widest) sections of the groove, and the center line is still narrow and clean after the brief 'widenings'. Therefore, we know the cutting stylus tip didn't break, which would have ruined...

Mothers are not said to be 'polished'. They're said to be 'buffed'. This is done because polishing the stamper face obviously hurts the sound. Buffing the mother is less harmful since the buffing is done mostly to the unused land. Both were done in order to facilitate the pressing operation and to m...

Perhaps it shows that they 'polished' the stamper and thereby broke off the peaks of the mountains, forming high altitude mesas (on the stamper) and flat land zones at the bottom of the groove of your pressing... The wider groove sections, having wide, flat lands, instead of narrow valleys, would ma...

Yeah, there's no mention of 'cadmium' in that patent application. Wondering if 'cadmium' was erroneously attributed to Wadsworth because, despite the Decca connection, the authors were from Schleswig-Holstein, and were, therefore, native speakers of German and, being not from America - the only plac...

Copper is actually soft compared to many metals. The TelDec .pdf mentions that it's amorphous copper and, therefore, is resistant to the elec-Troll -lytic (; processes which take place during electroforming of the sons. They are cutting ' mothers ' directly - which is the main reason for developing ...

Hola Claudio, General guidelines for Nickel Sulfamate bath concentrations are given on wikipedia. The page suggests a Boric acid concentration of 30-45 g/L, but the Nickel Sulfamate concentration would be ten times that amount (300=450 g/L), and, if used (?), Nickel Chloride would be no more than 30...

While that, all, may be true, it's not convenient to adjust a cutter's vertical tracking angle without adjusting its stylus rake angle. The Ortofon cutters that have been adapted for 25 degree VCA still have the stylus rake angle of just 1.8 degrees more 'scratching into the lacquer' than 90... The ...

http://torbenteknik.dk/ was crawled on June 1 of this year and can still be viewed using the Way Back Machine. The links are still hosting downloadable documents. The etec.dk site has been changed and no longer has a hyperlink to Ortofon gear, even though the image of the words is still at the top o...

The two Ametek/Lamb pump boxes, here, have no exit hole. Air escapes from the seam of the front panel. The box should sit on a foam pad to minimize vibrational hum. We put the pump in another room, using a vacuum hose extension with smooth inner wall (to minimize the loss of efficiency that the turb...

As for Ortofon information, this cat has 9 such tales: https://www.discolathe.com/viewforum.php?f=16&sid=3c3d275a2d23bb2c89cf22c38339b603

That's still in the past, if based on 15 degrees, but close enough for jazz. Guys, these carts now, since 1972, according to Nygaard, are making 20 degrees VTA. Maybe yours was set before or maybe they make actually 30 degrees, now?

- Fr. José †

Great idea to do this. You're getting 'warmer', Signor! (: Se vuoi inchiodarlo, prova a migliorare la corrispondenza più vicino alla prima ottava. Questa è musica da ballo (e io sono un batterista)... Rispettosamente, mentre la gamma media e gli alti sono abbastanza vicini, sento che ha bisogno di b...

boogievan wrote: ↑

Tue Jul 18, 2023 11:18 pm

...the treble pre-emphasis time-constant used for playback at 78 would also have to be multiplied by 0.57 for cutting at 45.

True, but it should read, '_divided_ by 0.57' when the playback target is 78 and the cut is made to slowed-down music at 45.

f. José

I Fibo-U-nacci.

When I first heard of King Tubby, I assumed he was fat. After looking at his pictures, I realized he's too slim to have been called Tubby, as a nickname, and yet he wasn't so svelte that it made sense as a form of sarcasm, either. I'm sure it was foisted on him by people who don't even like dub. 'Tu...

Speaking of those 37s..."Dub Master" = 37 (Septenary) (Permission to manifest these secrets granted by the qatholiq date-numbers of 2-day being those of Osbourne) Today's date can be written, 4.6 "Osbourne" = 46 (Single Reduction) "O. Ruddock" = 46 (Full Reduction KV) "Dub Master" = 46 (Keypad) The ...

Channel One had a Neumann which someone is checking out, here: https://i.pinimg.com/originals/30/47/70/3047702c15cf9b543333007ed74dde5f.jpg Counting the number of the coil windings, I see the date-numerology of King Tubby's murder was: (2 × 6 × 1 × 9 × 8 × 9 =) 7776. So, pretty ominous, right there,...