|
Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
|
Thread Tools |
11th May 2023, 12:34 pm | #21 |
Nonode
Join Date: Nov 2016
Location: Aberaeron, Ceredigion, Wales, UK.
Posts: 2,869
|
Re: Using a ceramic cartridge with a modern amplifier.
Trying to keep it simple ( for my benefit). So the more you bend the ceramic element the higher the output, is that correct?
John |
11th May 2023, 4:50 pm | #22 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,800
|
Re: Using a ceramic cartridge with a modern amplifier.
The instantaneous voltage created is proportional to the amount the ceramic or crystal is bent at that instant, assuming you have a very high impedance measuring instrument.
Bend it half as far, get half the voltage. Bend it the other way and get reversed polarity voltages. Make a long solenoid coil and move a magnet on a stick into it. Hold the magnet still - no voltage, true wherever the magnet is positioned when you hold it still. Move the magnet in and you get voltage. Move the magnet in twice as fast and you get twice the voltage. Move the magnet out and you get reverse polarity voltage. So piezo senses position, magnetic senses speed. For a single frequency signal, there is only one possible waveform, a sinewave. All other waveshapes have various patterns of harmonics. Only a pure sinewave has zero harmonics. So if there is only one frequency present, then you have a sinewave. If you have a sinewave on the groove, you can calculate the voltage a ceramic cartridge will give just from the amplitude of wiggle on the groove and the coefficient of the cartridge (Volts per millimetre or equivalent) If you have a sinewave on the groove, you need to know the frequency as well as the amplitude of wiggle in order to use the coefficent of a magnetic cartridge to give you the amplitude of its output voltage. David
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
11th May 2023, 5:48 pm | #23 |
Nonode
Join Date: Nov 2016
Location: Aberaeron, Ceredigion, Wales, UK.
Posts: 2,869
|
Re: Using a ceramic cartridge with a modern amplifier.
David, thank you for your patience in taking the time to give a detailed reply.
John |
24th May 2023, 11:12 pm | #24 |
Moderator
Join Date: Feb 2006
Location: Wembley, Middlesex
Posts: 7,219
|
Re: Using a ceramic cartridge with a modern amplifier.
All sorted: I ended up fitting a Chinese flip under cartridge and together with the circuits mentioned earlier in the thread, gave fantastic sound.
|
25th May 2023, 7:44 am | #25 |
Octode
Join Date: May 2009
Location: Stevenage, Herts. UK.
Posts: 1,515
|
Re: Using a ceramic cartridge with a modern amplifier.
Be aware that the stylus supplied with the flip under is not a true microgroove/78 type, but a BSR ST16/17 will fit and give the correct tips.
https://www.vintage-radio.net/forum/...27&postcount=3 |
25th May 2023, 12:10 pm | #26 | |
Moderator
Join Date: Feb 2006
Location: Wembley, Middlesex
Posts: 7,219
|
Re: Using a ceramic cartridge with a modern amplifier.
Quote:
|
|
25th May 2023, 12:57 pm | #27 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,820
|
Re: Using a ceramic cartridge with a modern amplifier.
No pun intended?!
|
25th May 2023, 1:23 pm | #28 |
Dekatron
Join Date: Nov 2009
Location: Lincolnshire, UK.
Posts: 4,985
|
Re: Using a ceramic cartridge with a modern amplifier.
I think this is the cartridge where the 'green' coded 78 stylus tip is on the opposite side to normal. I bought one of these cartridges several years ago to try out, but haven't so far done so - still using my stock of BSR X5Ms and the Chinese single red stylus in the black cartridge models. Do we actually know what the 'marked' 78 tip actually is, is it just another LP stylus or something in between? I seem to recollect that it looks slightly physically different.
|
25th May 2023, 3:07 pm | #29 |
Octode
Join Date: May 2009
Location: Stevenage, Herts. UK.
Posts: 1,515
|
Re: Using a ceramic cartridge with a modern amplifier.
Second LP stylus made out of different material see microscope pictures above
|
25th May 2023, 4:37 pm | #30 | |
Nonode
Join Date: Aug 2015
Location: Cambridge, Cambs. UK.
Posts: 2,196
|
Re: Using a ceramic cartridge with a modern amplifier.
Quote:
Martin
__________________
BVWS Member |
|