In the diagram attached I noticed they have a NTE452 JFet that is used for UHF/VHF applications.
Why do you think have they chosen it for this application being an amplifier, is it for signal quality reasons or just the gain available etc, or other reasons.
Is there a modern readily available equivalent so I can try it out?
This looks like an audio preamp to me. I think the OP's question was about the choice of a UHF/VHF JFET for an audio application. I'm assuming it is because it was available, and works.
This looks like an audio preamp to me. I think the OP's question was about the choice of a UHF/VHF JFET for an audio application. I'm assuming it is because it was available, and works.
You are right. I didn't look carefully at the schematic.
JFETs are sometimes used in audio applications because they are low noise and have characteristics similar to a pentode vacuum tube with a high input and output impedance. And a UHF/VHF type JFET will typically work fine at audio frequencies also.