Guillermo: To be linear, a 4-1000 needs to be run either in Class AB1 grounded-cathode, grid-driven or Class AB2 g-g, cathode-driven. For SSB, anode supply potentials of 6kV to 7kV are common. For AB1: a screen supply of 1000V is needed to make maximum output, and Bruene bridge-neutralization is not a bad idea above 15m.
cheerz
On Sep 16, 2006, at 5:04 AM, GGLL wrote:
A month or so ago, my cousin visited me with an unusual gift. He discovered
an old machine being scrapped and rescued for me (knowing my hobby) two Eimac
4PR-1000 tubes, with the chassis mount (blower fan included), two sockets,
clamps and chimneys. You may figure my surprise when I saw him at my house's
door with such bottles in his hands. The tubes where rescued from a medical
equipment, so I don't know the performance, although they look visually good
indeed. I read somewhere these are improved versions of the 4-1000 types, is
this ok?.
There is a chart for AB2 grounded cathode work in the ARRL handbook ('97)
which states 3000V plate voltage, and an idle current of 300mA. This while
idle means you are nearly maximum rated plate dissipation, is ok?.
Best regards
Guillermo - LU8EYW.
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