Did the TDI SL sweep speed mod today

[Jim in Idaho]

Bit the bullet and did the sweep speed mod this morning. Made a huge difference in the acceptable SS. I ran the 1 grain gold bar past the 8 x 6 Sadie coil before doing the mod, and there was a relatively slow, specific sweep speed that gave the best signal. Too fast, and the signal completely disappeared. After the mod, the SS made almost no difference. Fast, slow, the signal was steady. No change in indicated depth in the air test. Threshold was still smooth. I'll post a video of the before/after tests later on. I changed the filter caps (C20, 21) from .47ufd, to ,22ufd. A friend in Florida, who is a civilian tech working for the Navy, was kind enough to send me a few matched pairs of the caps. Without his encouragement, and help, I probably never would have tackled this. Now I'm really glad I did. One tool I'm glad I had was my fly-tying magnifying light. My eyes don't focus like they did when I was young, and that magnification allowed me to see the soldered spots, to be sure I had done a thorough job.
Jim

 

[Jim in Idaho]

I posted a video showing the sweep speed comparison for before and after the mod.
Sweep Speed

 

[markg]

That is awesome Jim. Thanks for all your contributions on this subject.

 

[doc holiday232]

Why can't Whites do these mods-----before they go broke??

 

[Jim in Idaho]

They are now doing the second mod...at least on the Special Edition model, and I've seen comments that all the SL's made since 2015 also have this mod.
Jim