On the other hand my measurements are correct and really do not understand why you do not believe these, just for your information my equipment is recently calibrated and are the following, tektronix SG502 signal generator, HP3478A, Fluke 8840A, Fluke 8060A, HP400H, tektronix D15 and 561A, these are used for measurement of frequency and Vrms and also EMU0202 as spectrum analyzer. Note also that the load used for these measurements is a 50W 8ohm power resistor. If you would like me to measure something else please be my guest. I really do not get why you are saying that the response you are getting is only 20-22KHz, maybe your output transformers are not up to the task? Maybe I can help you on that.