View Single Post
  #8   Report Post  
Old January 9th 08, 07:34 PM posted to rec.radio.shortwave
David[_5_] David[_5_] is offline
external usenet poster
 
First recorded activity by RadioBanter: Nov 2007
Posts: 247
Default Scratchy RF gain knob on 535D

CelticDude wrote:
On Jan 8, 8:24 pm, David wrote:
mc wrote:
"David" wrote in message
...
labtech_one wrote:
You can use contact cleaner, or just plain ole WD40, spray and work
the control back and forth a few times to break loose the
'dirt' and then spray again to rinse it away. Wait about 1 hour,
for the spray to dry, before using the radio again. WD and some
contact cleaners are a) flamable and/or b) conductive
I strongly recommend using the appropriate Caig product (available at Radio
Shack) rather than WD-40 or a solvent chosen at random. That will help
ensure that it stays clean and properly lubricated after the cleaner dries.
Huh? How hot a spark can you make with 6 V?
You can certainly make a spark with 6 volts. It's unlikely to happen in an
RF gain control.

I know you can make a spark; is it enough to ignite light oil? Naptha
perhaps...

I work in an electronics lab facility where we use every kind of cleaner
there is. We've never waited an hour to avoid explosions from the
De-Ox-It or the WD-40.


Thanks to all the responses. I had a couple of responses come
straight to my email, and they both recommended just turning the knob
back and forth. This did work a bit. Good to know I can use the
control cleaner too, if necessary.

DWP


Make a 12" loop of kite string, then make a small loop in that to go
around the knob. By moving your hands slightly you can work that knob
back and forth very easily.