My three B7971 clocks all produced RFI in the AM and SW radio bands, and I kept my radios at least 5m away. They were based on the CT7001 clock chip, so the MUX rate was about 2 KHZ. The RFI (and the acoustic singing from the tubes) seemed to change with the digits displayed. I assumed that it could be blamed on the switching of the HV on the tubes. Someone once suggested that the RFI came from the SMPS, but that is unlikely since I used old-fashioned linear supplies. In hindsight, I realize that I did not put a choke on the power cord, which might have helped. The moral of the story is that not all RFI necessarily comes from the power supply.
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