MHS 5200P Signal Generator

[gico750]

Hi everyone, for some time I have this signal generator, 25Mhz two channels, it is working, with a USB connection to the PC and related software.
On the rear panel it has, among other things, the outputs of channels CH1 and CH2 "power out" but connecting the oscilloscope probe I can't find any signal, do you have any information about it? maybe something wrong? In any case I can't understand what this output is for and if it probably doesn't work. I tested the front output ch1 and ch2, they run perfectly
In the manual it indicates it as a connector on the rear panel but does not specify anything else.
In the photo (internally) you can see on the left the voltage regulator board with a lot of cooling ...
I thank in advance whoever wanted to help me understand.

[gico750]

I would like to upgrade with THS3092 chips, then improve output signal.

I have another question, when I connect a small loudspeaker to the normal front output, the signal distorts a lot perhaps due to the absorption of the speaker.
That's why I would like to understand how to use the rear outputs which should be power.

[gico750]

yestarday the chip was arrived, i replace they but the signal is bad a so i install the original.... unfortunately the waveform worsens at the same frequency and amplitude so I'm back with the original chips.