According to heating method Vacuum tubes can be divided into 2 categories, direct heat and side heat. Direct thermal vacuum tubes were born earlier. It has a fatal disadvantage that the cathode is susceptible to the temperature of the filament and changes its characteristics. When the filament voltage changes, or when the filament is supplied with alternating current, the cathode exhibits an unstable state. The side-by-side vacuum tube is relatively stable. Since the volume and heat storage of the metal sleeve are much larger than the conventional filament, even if the temperature of the filament temporarily changes, even if the heating is stopped for a few seconds, the temperature change of the metal plate changes limited, which is why some expansion machines After that, the main reason why it can sing for more than ten seconds is because the internal power supply of the large-capacity capacitor is not discharged. Classified by container structure Most commercially available vacuum tubes are made of glass. Special types such as military are made of metal. (1) stainless steel polishing machine output good beam quality, including mode and mold stability; (2) stainless steel polishing machine output power is large enough (this is the key to speed and effectiveness), whether the energy is stable (usually requires stability of 2%, in some occasions is required 1%, so as to process the ideal effect); (3) stainless steel polishing machine should have high reliability, should be able to work continuously in harsh industrial processing environment; (4) stainless steel polishing machine itself should have good maintenance, fault diagnosis and chain function, downtime should be short; (5) the operation is simple and convenient, the control key function is clear, can refuse illegal operation, protect the stainless steel polishing machine from damage. Stainless steel polishing machine should follow the principle of purchase: stainless steel polishing machine technology has many valuable characteristics. However, specific to a product is suitable for the use of this technology, should follow the following principles :(1) with other existing methods can not be solved, only with polishing processing method to solve; (2) the existing other processing methods can be solved, but if the polishing processing method can greatly improve product quality, improve production efficiency and significantly increase economic and social benefits; (3) to fully consider the processing process with polishing processing related to those matching links; (4) to pay attention to the application of polishing processing and conventional processing composite processing technology, in order to make full use of their strengths Metallographic Polish ,Struers Polishing Cloth Polishing,Struers Polishing Disc,Trojan Polishing Consumables TROJAN (Suzhou) Technology Co., Ltd. , https://www.trojanmaterials.com