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That may be true that more x-ray emission comes from the CRT's without built-in safety glass if the safety glass is not in front of the faceplate...seems like modern CRT's have leaded glass in the safety glass or faceplate to attenuate x-ray's more.
Found a GE set which has a lead shielded rectifier tube to reduce x-rays, it is in a HV enclosure like any other set...but, there is an HV regulator tube (not 6Bk4 but something else) sitting right out on the chassis with the usual type of shielding around it...don't get that.
Seems like the cheaper sets like Silvertone put less shielding around the 6Bk4.
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