The T-16 and T-17 transmitters which operated in the standard broadcast band were very hard to find on the surplus market but were used by some as low power "pirate" AM stations with the addition of a modulation transformer in the B+ line and a suitable audio amplifier which was often a 50 watt 'HI-FI home entertainment amplifier. The tuning system would allow the rig to be loaded into almost any kind of vertical antenna for neighborhood and beyond AM broadcasting. The on air fidelity of the unit was very good. One T-17 was used on 1580 at three locations in Chicago as a pirate station in the 1960s with the local FCC office raiding the station three times at three different locations before the equipment was confiscated.