Malo sam googlao ovo !!!
Yet the MODEL 9 was more than just a looker. It was one of the first amplifiers to use a meter and knob to perform different test functions (at gain zero). It is equipped with trimmers to adjust the bias of every output tube, but also to set AC and DC balance, which was of course incredibly convenient for the user at that time as it meant that no scope or other testing equipment was needed. And such was the amplifier’s smooth control and stability of power, NASA famously customized the MODEL 9 for use in the Apollo Space Program.
Nevjerojatno ! Cak je i nasa koristila za apollo program ! To nisam znao dakle ampovi su zapravo remek dijelo i jedni od vecih povijesnih ampova . Wow