ZETAGI is a brand usually associated with CB radio products for 27 MHz although it seems that they also make RF power amplifiers for Italian CB band at 43 MHz.
The B149 and B129 models are shown below. Note that the Irish regulations for 30 to 49 MHz stipulate a maximum power output of 50 watts PEP.
This is designed for 42-44 MHz and runs off 12v DC. It's likely that it will work down to 40 MHz as well although the power may be slightly reduced.
The B149 amplifier is intended for increasing the output power of 43 MHz FM transceivers so there is no need for a TX/RX delay to stop the relay clattering on SSB. As such, it is not suitable for SSB and is more suited for just FM and CW.
This model runs off the mains (230v AC) and has a higher output of 100 watts.
There doesn't seem to be any AM / SSB switch and is probably just designed for FM.
It's not obvious if this amp is linear or just running in Class C i.e. suitable for FM only.
As of March 2019, this amp is for sale for €225 in Italy. Note that this amp is not listed in the Zetagi website so it may be a discontinued model.
1) Zetagi website
2) B129 amplifier for sale