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The 17LP4 is well operated with 14,000 Volts anode current. With such a high plate voltage, you should not see any ion burns, even after a longer time interval. My experience with vintage crts is that those with low EHT have strong ion burns and with higher EHT (above 7 KV) have dim or no ion burns. I did test it with a crt with a strong ion burn at 5 KV. When I increased EHT, the ion burn faded away.
- Eckhard
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