My first Oscilloscope

[Tibuck19]

Good evening everyone, Tomorrow I will be going to get my first (USED) Oscilloscope it is a Gould Advance OS250B, I think the b means its a 15Mhz and without the b its a 10MHZ. It does not come with probes So I order a set of these https://www.amazon.ca/dp/B00D5VAN6M/...088100_TE_item...

[HeatSink]

Hi everyone,
I recently finished my Hammerhead Rev D PCB, but I encounter a very annoying problem. My Hammerhead has a very high audio-frequency when no target is detected. Since I am new to the world of metal-detectors I don't know if it this is normal or not. I followed the instructions on Carl's...