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I should also mention that the above heater voltages are for a 6.3 volt heater. If using anything else other than 6.3, I would go 1 volt lower to start the cleaning and rejuv process, and not exceed 65% more than the heater voltage its rated for.
Although the filament is 100% overrated, the combination of the heat generated by over volting the heater and the intense heat surrounding the heater from rejuvenating the gun could cause the heater to fail.
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Jordan
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