by Record-changer »
Sun Jan 17, 2010 8:53 am
There are several possibilities:
1. The records were played with a bad stylus, the wrong stylus, or an acoustic player.
2. The records were made that way. Some budget labels (e.g. Pickwick) hiss when first purchased. Recycled vinyl was often a cause.
3. Mono records made before the stereo record was invented hiss in stereo. Manufacturers didn't try to remove noise in the vertical direction before then. That's why the stereo-mono switch exists. Use it.
4. A stereo record was played with a mono cartridge with no vertical compliance. This damaged the vertical part of the recording. It will play OK in mono, but not stereo.
5. The records were left in the sun. The sound quality often suffers before the record warps. I have one record that was left in its jacket in a place where the sun shined on half of it. It has a once-around hiss. Note that an entire shipment of records could be ruined if left in a semitrailer sitting in the sun for a long period.
6. Foreign matter is in the grooves.
7. The record was cleaned with something that damaged the grooves. Often, a styrene, filled vinylite, or shellac record was cleaned with a solution containing ethanol that didn't affect true vinyl records. This is why you have to be careful to choose the proper product for cleaning the records.