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June 15th 08, 02:42 AM
posted to rec.radio.amateur.boatanchors
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Northern Electric R221-DX Tube Info?
On Jun 8, 9:48*pm, Dale Carlson wrote:
On Sun, 08 Jun 2008 16:37:50 -0700, I wrote: ... I bet their 0.6A filament's life is a lot shorter than the regular .25A ones... Err, I meant to type "0.06A". Dale Doesn't that have something to do with older tubes being 'bright emitters'? Later, thoriated tungsten cathodes were introduced that could produce sufficient electrons with lower cathode heater current? |
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