audio power amplifiers employ power output transistors which have
gain bandwidth products of 20-60MHz. While this generally meets
the needs of amplifiers handling frequencies to 20kHz, a 200kHz
amplifier places an order of magnitude higher demands on the output
LX741 features an output stage created from a large array of
small signal transistors, with gain bandwidth products of 650MHz.
This enables very low stored charge in the LX741 output stage to
handle 200kHz signals as easily as conventional amplifiesr handle
reduce high frequency distortion further, the LX741 output stage
also features auto bias and dynamic bias circuitry.
Conventional amplifiers generally operate in a manner where current
through one side of the output stage is entirely shut off during
high current in the other side. This produces a substantial discontinuity
that becomes difficult to correct at higher frequencies where less
loop gain is available. The LX741 maintains bias current in both
halfs of the output stage during all signal transitions providing
a much more linear power voltage follower.
output stage also features custom SMT heatsink convection cooling,
current limiting, and temperature sensing for enhanced overload
protection. Amplifier current is not returned to the LX700 common.