Thunderchild
New Member
Do LP's require RIAA preamps ?
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No.I thought the equalization is to flatten the mag. cartridge freq. response, i.e., higher output at higher freqs.
There's probably an equalization curve on the Internet; some dropped off at <10 Hz to avoid amplifying rumble.
I assume that the present amplifier system used by you, will have the needed RIAA pre-amp, if it has the Phono input? How come you need to make one afresh?well thanks mate but i've already ordered one for 11 £ which is fairly good as i can't make PCB's the last RIAA preamp i tried making on matrix board being very careful to follow the pcb layout just resulted in being a radio of some kind I'd be damned if i could ge a rexord to play through it but it was piking something up from somewhere (UFO ?) so I thought time to just buy one, anyway its nice to know the theory behind it
as we are transferring my dads LP (and some of the 78) collection into digital.
I thought the equalization is to flatten the mag. cartridge freq. response, i.e., higher output at higher needle speed, just like a generator.
There's probably an equalization curve on the Internet; some dropped off at <10 Hz to avoid amplifying rumble.
A crystal cartridge, high output and found in cheap phonos, may not have needed any equalization.
No.
Simply look at RIAA Equalization in Google.
You are quite right, crystal and ceramic cartridges need no equalisation - just a simple high impedance input.
Some crystal and ceramic cartridges are capable of VERY high quality reproduction as well - I always used ceramic for disco's, more than enough quality, and their higher tracking weight helped to prevent skipping.
Even Crystal Cartridges Require RIAA Compensation for phonographs.
This Compensation has nothing to do with the Type of Cartridge.
That's not correct. Crystal cartridges respond differently than magnetic cartridges. A crystal cartridge's output voltage is proportional to the amount of stylus movement but not frequency. A magnetic cartridge's output is proportional to both the amount of movement and the frequency of the movement. (A magnetic coil's output is proportional to the rate of change of the magnetic field, which goes up with frequency). Thus for a constant groove deviation amplitude, the magnetic cartridge output will increase with frequency, while the crystal cartridge output remains constant with frequency (assuming a perfect cartridge). The crystal cartridge thus has a relative rolloff of the high frequencies and a gain for the low frequencies as compared to the magnetic cartridge. Since this is the approximate response you need for the RIAA compensation, a crystal cartridge will sound reasonably good with no added equalization (as Nigel noted).Even Crystal Cartridges Require RIAA Compensation for phonographs.
This Compensation has nothing to do with the Type of Cartridge.
Has anybody played a vinyl record in the last 30 years?