[Hallicrafters] 4PR65A

[Walt Cates]

Ray,
The 4PR65A tube was used in radar and ground station navigation equipment. It was specifically designed to handle high power pulse modulation. It was also known as the 8187. I cannot remember what equipment it was used in, but remember it from navy days in the early '60's. May be this will jog someone's memory.

Best Regards, Walt Cates, WD0GOF, http://www.myhamshack.com/WD0GOF/<http://www.myhamshack.com/WD0GOF/>
A veteran is someone who, at one point in his life, wrote a blank check made payable to 'The  United  States of America' for  an amount of  'up to and including my life.'