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They may be interchangeable in the socket, but there's a world of difference beyond that. Just start with the power supply required for the filaments. Both require 5.0 volts. The 3-500 filaments require 14.6 amperes. The 3CX1500D7 takes 30 amperes.
Plate voltage? The 3-500 is rated around 2800-3000 volts. Compare that with 6000 for the D7.
I am beginning the packing process...XENIA bound Going "Lite": this year....2 items for sale...Rig #1 = FT-920/Gud to Ex condition/Hand Mike/pwr cord/manual (NO BOX) ... #2 = My 1 owner FT-950....EX condition...Original Shipping Double Box/Factory Manual/Never used hand mike...Booths 9107-9111...Ya'al come by say hello...
Another major solar flare, but this time from an active region just beginning to turn into view off the east limb. It is possible that the group responsible is old AR 3654 from the previous rotation. The latest flare, an X2.99 event just peaked at 14:38 UTC (May 15). Stay tuned
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