[TenTec] Omni VI Rubbery crud on PCB

Bwana Bob wb2vuf at verizon.net
Mon Jul 17 21:22:20 EDT 2017

Yuk!  I've seen brown crud on the foil side of the circuit boards  my 
Paragon and another one that I worked on. In those cases the crud was 
excess soldering flux. I cleaned it off with isopropyl alcohol and 
cotton swabs.  The white stuff may be some kind of oxidation or 
corrosion.  Mold would be black.



On 7/15/2017 7:32 PM, Ken Brown wrote:
> My Omni VI had some dark brown rubbery stuff on the XTAL osc and BFO
> printed circuit boards, It is sort of like rubber cement and reminds me of
> similar stuff I found in Kenwood TS-440s. There is also blue green copper
> corrosion on the edges of the rubbery crud along with with white powdery
> stuff. I think the powdery stuff may be mold or fungus. I have spent
> several hours on each board trying to remove it as best I can.
> It is not on every board, and not on any of the boards in an older Omni VI.
> I am wondering if it is something that was put there by the Ten-Tec
> factory, or if some previous owner did it? I guess it's purpose may be to
> dampen possible microphonics in the oscillators. It definitely caused some
> undesirable, unintended consequences in a humid climate.
> Has anyone else seen this in an Omni VI?
> DE Ken N6KB
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