[78-L] EQ ideas for transferring acoustic 78s?

[DanKj]

 That is correct - we hear 120 because the "60" refers to how many times the 
electrical current is reversed each second - it doesn't refer to a sound 
frequency.

 The story of how & why the cycles of 25 & 60 were chosen is interestingly 
told in "Empires of Light" by Jill Jonnes.  Westinghouse had built many 
power stations using much higher frequencies, but Tesla's induction motor 
(which took much work by Westinghouse's team to be practical) just wouldn't 
work with anything but 60.  25 was a grudging compromise, made with the 
Niagara Power Co's consulting engineer who wanted something like 16 for 
industrial motors, but that would've made electric lamps flicker.

 Maps of Buffalo pre-1935 show 60 in one part of town, 25 in another, and 
overlapping areas where 60 ac, 25 ac, 200 volt DC or 500 (!) volt DC could 
be had.  500 was for running elevator motors.  I think they also had arc 
lights in the shopping district, using 2000 or 3000 volts AC. Those were the 
fun wires that fried anything they touched - like the helpful cop in 1901 
who tried to move a fallen wire out of the road, with his bare hands.

ps - I've been using Audacity lately, to remove ticks & pops by enlarging 
the wave image to the max & then redrawing the spike using the cursor.  I 
had been using copy&paste to take a tiny adjacent section & covering the 
tick, but this is better.


----- Original Message ----- 
From: "David Lennick" <dlennick at sympatico.ca>


> ps..we may HEAR 120 but what shows up on the display is 60hz.