Certainly sounds possible, not trivial but a good analog designer could come up with something that would do it I'm sure. Careful attention to layout will be required.
It's just an amplifier, but there must be an awful lot in that small package. I was thinking of using the output power amplifier of the Wavetek 166 as a guide but when I looked at it, there is a huge amount of parts and it would be a huge build. There should be room inside that case if it did go bigger.
Apparently, this is a well known failure of this excellent generator. Why Keysight won't sell the part, I dunno. If it was a $1000 generator I could almost understand, but a $6000 instrument and the only repair option is a $3500 swap-out?
If the problem is that prevalent , someone could design an adequate board and sell it. I doubt it would be worth anyone's time or investment.
I could bring the "good" signal to the front panel out of the internal attenuators (which are before the power amp, or the majority of them are), if there was an off the shelf RF amplifier one could buy relatively cheap, but that's probably too much of a cobble.
Just a nice, simple amplifier/driver would be nice. Myself, I don't need over 30Mhz. Output amplitude variance can be compensated for.
I'm sure this is a lost cause and I will just buy a used one (with return policy) off of eBay for about $2500.00. The other generator mentioned might be an idea too.
Since they can't be repaired, even a Chinese brand in the $1000 range may be an idea and write some code for it, but they don't do GPIB, probably just network and the rest of the test equipment I use is still GPIB.
I need to do some more searching....
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