From: owner-ammf-digest@smoe.org (alt.music.moxy-fruvous digest) To: ammf-digest@smoe.org Subject: alt.music.moxy-fruvous digest V14 #4767 Reply-To: ammf@fruvous.com Sender: owner-ammf-digest@smoe.org Errors-To: owner-ammf-digest@smoe.org Precedence: bulk alt.music.moxy-fruvous digest Friday, August 14 2020 Volume 14 : Number 4767 Today's Subjects: ----------------- Supercharge Your Body-Detoxes Liver & Other Organs ["Apple Cider Vinegar"] ---------------------------------------------------------------------- Date: Fri, 14 Aug 2020 05:51:01 -0400 From: "Apple Cider Vinegar" Subject: Supercharge Your Body-Detoxes Liver & Other Organs Supercharge Your Body-Detoxes Liver & Other Organs http://sonuscomplet.us/WRZ7lElH-yO1ED7cj-F5wumPdgTiJ5_jRU9TlqGd3v3I1-cx http://sonuscomplet.us/ZG6mhNn3yZfdpV-CJFtUGJOaxknDsN1OLA8gAMnwzqPh0c0F The stereo image was not made up of fully discrete Left and Right channels; each channel's signal coming out of the cartridge contained a small amount of the signal from the other channel, with more crosstalk at higher frequencies. High-quality disc cutting equipment was capable of making a master disc with 30b40 dB of stereo separation at 1,000 Hz, but the playback cartridges had lesser performance of about 20 to 30 dB of separation at 1000 Hz, with separation decreasing as frequency increased, such that at 12 kHz the separation was about 10b15 dB. A common modern view is that stereo isolation must be higher than this to achieve a proper stereo soundstage. However, in the 1950s the BBC determined in a series of tests that only 20b25 dB is required for the impression of full stereo separation. Thin, closely spaced spiral grooves that allow for increased playing time on a ?33 1?3 rpm microgroove LP lead to a tinny pre-echo warning of upcoming loud sounds. The cutting stylus unavoidably transfers some of the subsequent groove wall's impulse signal into the previous groove wall. It is discernible by some listeners throughout certain recordings, but a quiet passage followed by a loud sound will allow anyone to hear a faint pre-echo of the loud sound occurring 1.8 seconds ahead of time. This problem can also appear as "post"-echo, with a tinny ghost of the sound arriving 1.8 seconds after its main impulse. Factory problems involving incomplete flow of hot vinyl within the stamper can fail to accurately recreate a small section of one side of the groove, a problem called non-fill. It usually appears on the first item on a side if present at all. Non-fill makes itself known as a tearing, grating or ripping sound. A static electric charge can build up on the surface of the spinning record and discharge into the stylus, making a loud "pop". In very dry climates, this can happen several times per minute. Subsequent plays of the same record do not have pops in the same places in the music as the static buildup isn't tied to variations in the groove. An off-center stamping will apply a slow 0.56 Hz modulation to the playback, affecting pitch due to the modulating speed that the groove runs under the stylus. The effect becomes gradually more acute during playback as the stylus moves closer to the center of the record. It also affects tonality because the stylus is pressed alternately against one groove wall and then the other, making the frequency response change in each channel. This problem is often called "wow", though turntable and motor problems can also cause pitch-only "wow". Tracking force of the stylus is not always the same from beginning to end of the groove. Stereo balance can shift as the recording progresses. Outside electrical interference may be amplified by the magnetic cartridge. Common household wallplate SCR dimmers sharing AC lines may put noise into the playback, as can poorly shielded electronics and strong radio transmitters. Loud sounds in the environment may be transmitted mechanically from the turntable's sympathetic vibration into the stylus. Heavy footfalls can bounce the needle out of the groove. Because of a slight slope in the lead-in groove, it is possible for the stylus to skip ahead several grooves when settling into position at the start of the recording. The LP is delicate. Any accidental fumbling with the stylus or dropping of the record onto a sharp corner can scratch the record permanently, creating a series of "ticks" and "pops" heard at each subsequent playback. Heavier accidents can cause the stylus to break through the groove wall as it plays, creating a permanent skip that will cause the stylus to either skip ahead to the next groove or skip back to the previous groove. A skip going to the previous groove is called a broken record; the same section of 1.8 seconds of LP (1.3 s of 45 rpm) music will repeat over and over until the stylus is lifted off the record. It is also possible to put a slight pressure on the headshell causing the stylus to stay in the desired groove, without having a playback break. This requires some skill, but is of great use when, for instance, digitizing a recording, as no information is skipped. ------------------------------ End of alt.music.moxy-fruvous digest V14 #4767 **********************************************