I started with a 1974 Whites GoldMaster TR66b BFO Straight metal machine NO discrimination.
I still have it and it’s still working, I called whites and wanted to know what the was frequency it operates on, no one knew, but the oldest employee Mary might know? My answer was anything over 10 - 1,000 KHz! Fun big blue / green box a real arm killer. Now after owing almost every top end model, I’m down to just 4
Whites detectors, a TDI Beach Hunter, V3i w/ five coils, a DFX 300 & a Beach Hunter 300.
The Beach Hunter 300 is a waterproof DFX easy to use simple machine. (All DFX machines are always working in salt mode) Shame whites didn’t per-sue making a waterproof V3i, would have maybe been a killer machine.
I’m at an older age where walking the beach, enjoying the scenery, swinging a detector is good exercise, not to mention that every once in a while you find that treasured prize.
As far as Pulse machines “Silence is not Golden” yes, you could dig everything. Also remember that “Even a blind squirrel will find a prize” if it tries hard enough!