Hi All, As most know I don't like to advertise at the main forums so I have added this forum where you can see updates, sales, specials, etc that are available at my store. So do not enter this forum if ads offend ya...
This section is a little different and the place to post prospecting questions, birthdays, and talk not directly related to other sections of the forum, but still related to gold prospecting. No Political or religious posts will be allowed please and will be deleted by staff
Andy quick answer. on the SD series they used the aluminum control housing for a shielding to block EMI. thats why it had a aluminum foil barrier under the plastic end plates.
same reason for the foil inside co-ax cable and the carbon shielding in the early coils.
Big tip: if you have even a small hole without shielding from the coil to the control housing it will let EMI in.
If you want to know more PM me. I modded early minlabs for years.