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Well I have three of them and the ts18 chassis looks the same but have many differences between the ts4s line. For example the 6sq7 is not in the 18 chassis there is a 12sn7 and used for both the verticle and audio and also the fixed trimmer for the horizontal on the ts4s is a 50mmf mica where the trimmer on the 18 is a 20mmf mica so becareful there are little things that are different.
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