I've been reading all the ST-140 threads I can find and still don't feel solid on the various iterations. I believe there are at least 4 versions of the B&K ST-140, possibly (many) more.
I have the early ST-140 with the red lettering and the light up push button. Does anyone know if the push button version is different from the version with red lettering and the red flip switch?
Photos attached.
Thanks!

I have the early ST-140 with the red lettering and the light up push button. Does anyone know if the push button version is different from the version with red lettering and the red flip switch?
Photos attached.
Thanks!
