A
12AV7 is in that 'hotter tube' territory, similar power-rating to a 12AU7 or a 12AT7 and with an amplification factor that is mid-way between those other two types, but with a lower plate resistance and a wider bandwidth than any of the 12A_7 family. It would be a good sub for a 12AT7 in BF amps to tame down the reverb driver side, or further tame down the LTP in BF amps and give them a tamer warmer sound. Or if you have a 12AU7, subbing in a 12AV7 would increase the gain, so that's thinking for example in something like a Maggie vibrato circuit.
Having that lower plate resistance and wider bandwidth, it would 'sing' more if the load was lowered and the bias-point was cooler, compared the operating conditions you get in a typical 12AX7 or 12AY7 stage, in order to take advantage of the wider possible range of operating points.
Taking the load line in the datasheet I linked to above, a 20k load with an HT of 350V would would yield a plate voltage of about 175 @8.75mA with a bias voltage of about 3V, which requires a bias resistor (cathode bias) of 340R, so you'd use 390R, which would run it a little cooler. At this operating point the tube would be idling at 1.5W, so its still within its Pa(max) but because of the higher current, you'd need a minimum 3W 20k plate resistor if it was a simple inverting stage. 1/4W resistor would be fine for the cathode resistor.
In such a configuration the tube could take a 6Vp-p input signal cleanly and deliver about 180Vp-p cleanly, so it'd find it most optimal use further along the signal chain is you were looking for clipping, or in V1 if you want a nice clean sounding jazz amp or bass amp.