Trying to find name of old Robots vs. Japanese Monsters show.

I am trying to locate the name of an old Japanese T.V. series that ran in the late sixties, seventies. I used to watch all the time when I was a kid. I can't remember the name of it but I will give an extensive description of the show in hopes someone can recognize it and post to me the name of the show. I have searched extensively on IMDB and google and have come up with nothing.
To start the show had 3 main heroes that fought monsters/bad guys. The first being a giant metallic-gold robot that had long blonde hair coming out of his head and 2 not really horns but more like antenna's with small round balls attatched at the end . He had the ability to turn into a space ship. In robot form he shot rockets from his chest. The second was a woman in her upper twenties who had the ability to turn into a spaceship and the third a younger teen boy who also had the ability to turn into a spaceship. They all stayed primarily in a cave with an old man clothed in a white robe and had a cane.
There was another young boy that owned a whistle that could summon all 3 of them. He blew it once to summon the young boy ship. He blew it twice to summon the young woman ship. He blew it 3 times to summon the giant robot. He could blow it 6 times to summon all 3.
The main bad guy was a character named I think "DRAX". He was made of metal had 2 thick horns that narrowed to a point coming out of each shoulder. He had thick dark red hair. All of his minions were always dressed in all black. Completely covered in black from head to toe. If anyone recognizes and/or remembers the name of this ols show please reply to this message, I will be greatly appreciative