[AMRadio] Power Levels

[Jeff Edmonson]

: >From: "Jeff Edmonson" <w5omr at w5omr.shacknet.nu>
:
: >I still maintain that if a triode has 2000VDC applied to the plate (Ep) and
: >is
: >drawing a plate current (Ip) of 250mA, then the DC Input power is 500W to
: >the final.
: >
: >Class C amplifiers are (in all practicality) 75% efficient.
:
: According to Eimac, the 250TH running at 2000v/250ma (500 watts in) delivers
: 335 watts out in plate modulated service.  That is the actual rated plate
: efficiency of the tube.  Assuming 90% efficiency in the rf tank circuit,
: that leaves 301.5 watts.
:
: According to my BC-610 repair manual, the rated power output of the 610 on
: the lower frequencies is 300 watts.  On the higher end of the frequency
: range (vicinity of 18 mHz) they say 200 watts.

Right, Don.  And, therefore "close enough" to the legal limit output of 1500w
p.e.p.
(300w * 4 = 1200w p.e.p.), assuming 100% modulation, with symmetrical audio.

73 = Best Regards,
-=Jeff/W5OMR=-