>The short summary from my inquiry is that the 4PR-1000 is essentially
>the same device as the 4-1000 except it can survive higher plate
>voltages because it used in that type of service. HF Ham performance
>would be similar between the two.
>
>There appears to be limited data and experience using the Y448 from
>National. The most notable difference seems to be that this tube takes
>around 28-30 amps on the filament compared to around 20 for the 4-1000
>series.
>
>....BTW...the anode on my 4pR-1000 glows a real pretty bright orange : )
>
** Tetrodes with handles emit an erie blue light from the ceramic
anode-screen insulator. The blue light process: Those electrons from
the cathode that miss the anode, collide into outer-band orbit electrons
in the Al^2-O^3 ceramic, which temporarily bumps them into higher-orbits.
When these electrons slow down and fall back to their natural orbits
they give up energy in the form of blue photons. This is essentially the
same process by which flourescent lamps emit light.
- I know of no ceramic-metal tube amplifier builder who goes to the
trouble to add a clear viewing window to the fibergass chimney as well as
to the aluminum front panel of an amplifier.
. >Thanks to all who responded to my e-mail.
>
>de steve ve6wz. http://www.qsl.net/ve6wz/index.html
>
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