I made a bunch of scope clocks in the early 2000s, using the Chinese
National Electronics 3RP1As (sold by Richardson). They are most all
still running. I personally had mine wear out after about 13 years.
That's 100,000 hours!
On 6/1/15 3:18 AM, Oscilloclock wrote:
CRTs are just fabulous! Welcome to the looney bin.
Would you mind posting links to those threads? I haven't chanced upon any
holistic research comparing phosphor life across CRT types, so if anyone knows
of such it would be fun to see. I personally use as a rule of thumb 2000 hours
useful continuous life at normal intensity for vintage NOS tubes made by brand
manufacturers such as Sylvania or Toshiba in the U.S. or Japan. Multiplied by
10 for Tektronix and HP! :)
General ways I avoid the grave disappointment of an early CRT failure:
1. Auto-power off (and On - in my Wishlist)
2. Auto or manual dimming to save the phosphor
3. Screen saver (bump or image change)
4. Soft-start
5. HV application AFTER heater is warmed up (Wishlist)
6. Secure LOTs of spares!
Aaron
--
David Forbes, Tucson AZ
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