![]() This is done here, as well as in our ALIS-5SE Ultimate OPT for 300B or 2A3 to improve the performance and power handling, yet retain the low frequency response, where primary inductance of18H result is as good as 28 or 34H at actual circuit. The in circuit measurement below has proven our theory and the low frequency response is as good as with high primary inductance, and yet, our output transformer can perform as good as s mall sig nal results at full power, as required by the user 's demand. We lowered the primary inductance know ing ly to counter such effects. The low frequency response of this output transformer is not limited by the primary inductance, but b y the core's Bmax, magnet i zation saturation (maximum flux de nsity), to sustain the flux de nsityat such power level. The term pushpull is sometimes used to generally refer to any converter with bidirectional excitation of the transformer. In order to increase the core's Bmax, m agnetization saturatio n (maximum flux densi ty ), a calculated precise air-gap is inserted into the core to sustain such power output at 20-30Hz. Act ual power rating at 30Hz is over 500W. 212 PPP OPT was designed with 350W at 20Hz.
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