Maybe you could find a low frequency, high power RF amp rated for +33dBm output power instead? I don't know of a lot of premade options for this kind of amp, but perhaps one of these inline RF amp modules would qualify for being characterized and otherwise official.
Problem with these RF amps is they don't go down to DC and they are rather limited regarding the load impedance (usually 50 Ohms). If it's got to be something off-the-shelf, @HighVoltage's best chance are probably the mentioned Rigol power amp or it's
Siglent counterpart SPA1010.
If a DIY solution would be an option, a single LT1210 will easily match the requirements. The difficulty with the high-power, parrallel solution that I'm conducting is that virtually all the components have to be matched (LT1210's for offset voltage, possibly for impedance at the feedback input and maybe also open loop gain, feedback resistors for very low deviation within one set so the gain of the ten paralleled amps is matched as accurate as possible). Only this way it is possible to use resistive summing up of the outputs (0.33 ohms in series with each output) without much cross currents. Supply voltage has to be very close to the limits for the device (it's planned to use +-17.5V) to reach the desired output voltage swing and it's got to be accurately regulated (probably a switcher with a linear post-regulator)
It seems the prototype performs quite well but the project has been on a hold for some time due to other duties. PSU design is a little awkward but I've got some ideas how to get where I want. Since it's a hobby project, something I always wanted to make, I'm not in a hurry and eventually it will be completed. So far, if I need to use the amp for some testing, I simply hook it up to a lab supply and strap it to a larger heat sink and that's it. And one can virtually fry anything attached to it...
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