[Milsurplus] For God's Sake- Stop and Think

[Rev. Don Sanders]

As aa ham for nearly 60 years, an engineer for 30, and personally believe to
be a reasonable troubleshooter, I over the obvious also.
I've been working on a DX60B with low highvoltage on the final. Got it
working after fixing several bad solder joints, replacing 2 overheated
resistors, and had several contacts with only 25 watts output. I had only
200 volts on the 6146 final. Having this voltage, I overlooked that the 100
ohm, 10 watt, resistor in the filter could be open. There was voltage! After
looking for a reason in the circuits for this oproblem, I checked the
resistor. Yep, it was open. Replaced it and the filter cap, 40 uf at 450
volt, started smoking. Ah-ha the real cause the leaky cap overheating the
resistor. Pays to sit back and really look at the obvious. New cap and new
100 ohm 10 watt resistor and it has the 70 watt output I expect. Just a hint
for those who have the inclination to dig in and learn to fix these old mil
and boatanchor rigs. Also remember, many of the older resistors are not
insulated. Don't touch them or have anything touching them. Leakage paths
are a killer.

Healthfully yours,
                          DON W4BWS
----- Original Message ----- 
From: "Joe Foley" <redmenaced at yahoo.com>
To: <milsurplus at mailman.qth.net>
Sent: Tuesday, November 01, 2005 11:00 AM
Subject: Re: [Milsurplus] For God's Sake- Stop and Think


> And we're not talking about a
> > newbie ham, either.
> > He's been a ham since the 50s and was a broadcast
> > engineer for several
> > decades too.
> ++++++++++=
> What you need to consider here is this:  If you are
> trying to find a problem that someone like you
> describe CAN'T find, then you need to suspect
> EVERYTHING!!
>
> I always want to know who tried to fix the stuff I
> work on and how they made out with it, and not so I
> can make accusations either.  I often have a hard time
> getting an answer, too.
>
> Also, in a situation like that make sure everything is
> RIGHT before you look for what is wrong (see reference
> to suspecting everything).
>
> Electrician's first rule of troubleshooting:  Make
> sure it was wired right the first time, I don't care
> how old it is or how long it's been in operation!
>
> Joe
>
>
>
>
>
>
>
>
> __________________________________
> Yahoo! Mail - PC Magazine Editors' Choice 2005
> http://mail.yahoo.com
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>