[time-nuts] Heated crystal? & Rb tube corrosion (FE-5680A)

[Arthur Dent]

The original photo linked to show 'corrosion' didn't have enough detail to 
show what was there plus the tungsten color cast made it impossible to tell 
what the correct colors were. I received my 5680A today and after checking 
it out as received (9.999,999.99675Mhz after 30 minutes), I removed it from 
the circuit board and took the bottom plate off to see what mine looked like 
inside. The bottom plate and the clear fiberglass sheet looked like there had 
been a resistor that fried and sooted up the area. What it appears to be is 
either a spray coating or residue from a wash to remove flux. The color is flat 
black and it is like a very thin uneven coat of spray paint but it isn't on everything 
in the area. The unit may be new or at least like new so it isn't from any part that 
fried and the unit works as intended. Bottom line is that it isn't corrosion and I'm 
sure it isn't anything to be concerned about. I have attached a photo of the same 
area that the original photo covered so you can compare the original photo to 
the one I just took and linked to. 

original- http://n1.taur.dk/fe5680a-2/IMG_1375.JPG
mine- http://farm8.staticflickr.com/7161/6488370449_a4cb3fc21e_b.jpg

-Arthur