Hello! I have a signal at fixed frequency of 4 MHz and amplitude of 0.075 V. I need to amplify it to ~75 V with the same frequency. I checked online a bit and I found either cheap amplifier that can't amplify this much, or very expensive ones that (almost) can (I might need to use a smaller amplifier beforehand). I am still trying to find the best option, but for basically everything I found online, they claim large bandwidth, which I assume it's a contributing factor to the high price, too. However, I just need it at 4 MHz. Naively, I imagine one can build a simple RLC circuit for this. Of course in practice there are other factors to account for, so it is not really trivial, but I assume it would be a lot easier/cheaper to have an amplifier at a fixed frequency, rather than one with a broad range. Can anyone advice me on what is the best way to go (or even an amplifier model)? Are there comercially available amplifier with a fixed (or narrow band) frequency? Thank you!