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The transmitting tubes TT21 and TT22 have almost identical transfer characteristics to KT88 but a different pinout, and by virtue of their anode being connected to the top cap have a higher plate voltage rating (1.25 kilovolt) and a higher power output capability of 200 watts in class AB1 push–pull.
For example, a transmitter driving the input with 100 watts will be amplified to 2,000 watts (2 kW) output to the antenna. Solid state linear amplifiers are more common in the 1000-watt range and can be driven by as little as 5 watts. [ 3 ]
Assuming linear, perfectly symmetrical, 100% modulation of a carrier, PEP output of an AM transmitter is four times its carrier PEP; in other words, a typical modern 100-watt amateur transceiver is usually rated for no more than, and often less than, 25 watts carrier output when operating in AM. [2]
The class H amplifier can actually be thought of as two amplifiers in series. In the schematic example shown by the figure, +/- 40 V rail amplifiers can produce about 100 watts continuous into an 8-ohm load. If the output signal is operating below 40 volts, the amplifier only has the losses associated with a 100 W amplifier.
The maximum legal CB power output level in the U.S. is 4 watts for AM (un-modulated carrier; modulation can be four times the carrier power, or 16 watts PEP) and 12 watts for SSB, as measured at the transmitter antenna connection. However, external linear amplifiers are often used illegally.
The Memphis also marked the return of combo amplifiers to the Fryette line. The Class A, 2 channel Memphis Thirty 1x12 was the first amp in the new Memphis Series and features EL84 power tubes, 30 Watt & 18 Watt power modes & a unique removable hatch on the front panel allowing users to easily access and change pre-amp tubes.
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