This sounds like a similar some 440s had.  The problem was the glue or 
wax would become conductive after a period of time.  I had one and had 
to send it off.  They had to remove parts, scrape off old wax and 
rebuild.
73
Butch
WA0VJR
Node 3148
Wallace, ks.


On Tue, 10 Jan 2012, Dave Marthouse wrote:

> I had a 3530 on 220 in the 90's.  The radio from an accessibility standpoint
> was great.  The down side was that a good number of them developed vco
> issues that caused noise in receive.  It must have been a mechanical issue
> as I could tap a place toward the rear of the radio on the top cover and
> aggravate the problem.  Friends who had the radios reported that after a
> while with one mounted in a vehicle the problem developed in a good number
> of the rigs.  As I recall a friend was able to solve the problem with a fix
> for the vco.  If I remember correctly he had to open the radio, get at the
> co and melt the wax that the components were mounted in then somehow
> mechanically re-seat them and reset the protective wax.
>
> It was interesting to note that my radio which didn't see service in a
> mobile environment developed the problem over a year or two of use.
>
>
> Dave Marthouse N2AAM
> [log in to unmask]
>
>