Well, that's useful to know. Actually, I have some Kroil, my local
hardware store just began to stock it along with gun cleaning stuff.
I agree that recommendations for cleaning based on experience would
be valuable to the list. I also use Barkeepers Friend and also Zud which
appears to be identical. I also use plain toothpaste for cleaning
delicate items and polishing plastic. It works as well as the expensive
special plastic polishing cleaners.
This problem is interesting because Hallicrafters used an unusual
noise limiter arrangement. It would be interesting to know what other
receivers use it. Namely, a diode clipping limiter in the IF rather than
detected audio. In the SX-117 it serves to keep the noise peaks from
activating the AVC, which is the purpose of the Lamb type noise blanker,
but is much simpler. However, it does not have the advantage of the
"automatic" series noise limiter found in older receivers of minimizing
distortion on AM. It should work better for CW or SSB where the BFO in
the usual set up makes the noise limiter inactive.
Hallicrafters was the first to use the Lamb type blanker (in the
SX-28) but it did not work well there and I suspect they did not quite
understand how it works.
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On 6/8/2024 8:00 AM, Jim Whartenby via groups.io wrote:
Richard
I am recommending penetrating oil to clean and lube switches and pots.
Kroil, Deoxit and the like are effective but are also expensive.? Just
trying to point out that there are alternatives to name brand items
which also do a decent job at a very reasonable price.
Perhaps we should share some cleaning tips on the reflector.? I am sure
that there are many products that do a decent job and are less
expensive.? I can recommend Bar Keeper's Friend for general metal
cleaning, it works well for me.? For wood cabinets, waterless hand
cleaner also does a decent job without harming the remining finish.
Regards,
Jim
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
