[Hammarlund] HQ-150 Question

[Ken]

I had heard of this many years ago, and had a necessity to use it, once.The method worked and there were no subsequent "issues".I have never had a need to use it since, but I do keep it in my own "bag-o-tricks".Ken W7EKBSent via the Samsung Galaxy S21 5G, an AT&T 5G smartphone
-------- Original message --------From: Richard Knoppow <dickburk at ix.netcom.com> Date: 7/30/24  22:24  (GMT-08:00) To: jthorusen at centcoast.com, Dan Martin <pitfit at comcast.net> Cc: hammarlund at mailman.qth.net Subject: Re: [Hammarlund] HQ-150 Question     I have never heard of doing this, it seems rather draconian. An ohm meter should serve to find if there are shorts in the cap and I would think running a fairly stiff paint brush through the plates would knock off whiskers, etc.     I would be extremely careful of trying this procedure because you might fry something irreplaceable.     Clear the swamp???On 7/30/2024 8:58 PM, jthorusen at centcoast.com wrote:> Greetings to Dan and the Hammarlund list:> >     OK, time for nuclear weapons.   Equipment required:   60 watt or larger> line isolation transformer.   60 watt dim bulb tester.> >     Procedure:   Carefully disconnect ALL leads to the C1 tuning capacitor.> Double check this step!   Once you are sure that the capacitor has been> isolated from all circuitry except chassis ground, connect one output lead> of the dim bulb tester to chassis ground.   Connect the other lead to the> offending sections of C1.   This places a 60 watt light bulb (for current> limiting) in series with the capacitor and an AC line cord.   Plug the AC> line cord into the isolation transformer and plug the isolation transformer> into the wall.   Rotate the tuning capacitor back and forth through its> entire range several times.   Presumably the light bulb will flicker on and> off at first, and then will remain off as all "whiskers" or other metallic> contaminents are burned away.   Once you can rotate the tuning cap through> its entire rangre without any response from the light bulb, un-plug the> isolation transformer, disconnect the dim bulb circuit and re-connect all of> the normal connections to C1.   Test for noise.> > Good Luck!> Jim T.> KB6GM> Palus delenda est.-- Richard KnoppowLos AngelesWB6KBLSKCC 19998______________________________________________________________Hammarlund mailing listHome: http://mailman.qth.net/mailman/listinfo/hammarlundHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:Hammarlund at mailman.qth.netList Administrator: Gary Harmon, K5JWK** For Assistance: gharmon at idworld.net **This list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.html