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Wait - you have me confused. I thought one 'scope malfunctioned regardless of which CRT you used, and all CRTs work fine in other 'scopes. Now you say something else.
I also started my 'scope career with a Dumont 304A. Then I "upgraded" to a 401. Once I got my hands on Tektronix I never looked back. I had several 545s and 535s and a delightful 547 and a Fairchild clone. Now I have four Tek and one HP, all solid state. One of the Teks is surplus to my needs so let me know if you are interested.
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