You don't understand.ahh, ok so a second TL071 will take it from 1000 times up to 1024 times? Sorry this is the first time I've used a TL071 chip, bit of a newb
If you had a very high frequency opamp then the 1M and 1k resistors would make the gain 1000 times. But the max gain of a TL071 opamp at 40kHz is less than 100, about 85 times. So if you use two TL071 opamps in series (or a TL072 dual opamp) and each with resistors setting their gains at 32 times then their total gain at 40kHz will be 1024 times. Their maximum voltage swing will be 28V p-p.
An old 741 opamp has a max gain of only about 20 times at 40kHz and its maximum voltage swing will be only about 7V p-p.
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