How are you measuring the current when the tube is in the CLOCK?? Ira.
On 5/29/2017 7:01 PM, Trumpeter wrote:
Hello gents, Some of you may remember the issues I have had with cathode poisioning on my in18 clock. I have been using a heathkit ip17 to repair the cathodes which has had some success, though the positioning has creeped back in most cases. One thing I have noticed is the tubes seem to light better/more evenly with the dc current from the ip17 than the PSU in the clock. It has had me wondering if there is something to the pulsating dc used in these modern clocks to control brightness, perhaps this can cause some tubes to develop poisioning more quickly? I ask because I can have a tube run for hours on the ip17 at 5mA then on the clock at the same current the same digit is poisioned within an hour or less. Why wold this occur?
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