Much lower gain. Not designed for linear service. It is an oscillator tube for industrial heating. On 9/20/2024 7:44 AM, Mark - N5OT wrote: > Greetings. I just found a 3-1000H in the junk box. How is it like and/ > or different from a 3-1000Z? > -- 73 de Mike, W1NR THAT was the equation. EXISTENCE!... SURVIVAL... must cancel out... programming! - Ruk -