New. Kit contains 47 electrolytic capacitors. All you need to recap Marantz 3800 preamplifier. SHORT PREVIEW. All electrolytic capacitors have limit of life. Normally it,s 5 -8 years depends of quality. Chemical oxidation, drying and evaporation oil inside , location on the PCB board, type of signals and voltages they working with and drop value - that is major factors what is destroying them. Capacitors extremely important to any audio device . Yon can,t build or create audio device on this planet not using them. Non electrolytic capacitors will work 5 times longer without change . INSTRUCTION. Pay attention on each capacitor replacement procedure what you are doing. Remember - they all have " plus' and " minus' polarity. Wrong installation will cause malfunction of your audio unit. After changing 2 -4 capacitors in series always check unit functionality. It will help you not doing installation mistake. Pay attention on capacitor value printed on its body. After you remove capacitor from PCB board mark plus side on PCB board. It will help you not reverse plus and minus when you going to install new one. Do not use old stock capacitors even if they are new. After 15- 20 years in stock EVEN NEW most of them will loose value and dielectric parameters . They will work but not long time. Remember - 50% of your sound quality - directly from your capacitors value and quality . Axial capacitors polarity - on picture #3. Radial capacitors polarity - on picture #4. GOOD LUCK AND HAVE A NICE DAY !