Thanks for the condolences. The replacement filter cap is
working well at
about 75VDC below it's maximum rating. the replacement is
running cool being
in the transmit mode all the time - or off. I will check
ir again (
temperature ) before putting it back on the operating position.
Right now it
is still on a workbench.
I buy in bulk a flea=markets and
install one in every rig when I first put it
on the air. I try to fuse it
just above the " blowing " point, installed in
one of the 110 VAC primary
power leads going to the power transformer.
the fuse holder that
permanently mounts on the chassis, with a little cap you
unscrew to replace
the bad fuse if the type I like to use. Quick and easy and
you don't have to
take the cabinet/cover off to get to the spent fuse.
On some of the older
transmitters like the classic Heath-Kits - AT-1 and DX-20
have thicker steel
chassis and then it is easier to mount a " one bolt holds
it in place ", but
it makes replacing the fuse more difficult.
Steve, basically I am a 75
year old teen-ager re-living my mis-spent youth
buying these 60 + year old
radios I couldn't afford when I was a kid and using
have other radios running full time, a pair of Iom 756PROIIs and an
765PROIII I just bought from the estate of my lifelong friend which
me I need to " thin our the herd somewhat here.
At Christmas time, one
of the big market items are fruit cakes - and their
main good point are the
cans they come in, which I use to store parts/wire/and
fuses in. I got tired
if buying expensive fuses one at a time, and started
buying assortments in
bulk at flea-markets, and now I have a fruit-cake can
full of almost every
possible fuse I might need.
Sorry for the long outpouring on this
subject. It is raining cats and dogs
here in east Texas rifght now and I am
trapped in my detached shack - not a
bad way to send the day.
the operating Voltages well below the ratings stamped on
Sam Neal N5AF
Celebrating 60 Years In Amateur
And the filter cap is still running cool to the
------ Original Message ------
Received: Mon, 05 Jun 2017
04:01:23 AM CDT
From: "'Steve Ireland' vk6vz@... [4sqrp]"
To: "Sam Neal" ,
Subject: Re: [4sqrp] Obituary(s) To A Filter
Cap And A 6X4 Rectifier Tube
Your email made me laugh
aloud – although not at the tragedy of course.
I may be laughing on the
other side of my face soon, having just replaced the
capacitor-in-a-can in an old Drake 2-B with four Chinese 450V
The rectifier whose bumps they are smoothing out just happens
to be a JAN
6X4. Maybe I should think about a fuse?.. ;-)
Have a great day,
Sent: Sunday, May 28, 2017 4:13 AM
To: 4sqrp@... ;
amecoac1@... ; GQRP@... ;
regenrx@... ; Robert Melton ; Sam Neal
Obituary(s) To A Filter Cap And A 6X4 Rectifier Tube
sadly report the passing of two QRP radio transmitter components.
( #1 )
Passing ( Suddenly! ) of a 22 mFd/450 Volts DC Filter capacitor.
approximately 2007 in China ( The People's Republic There-of )
suddenly ) just before the 4 States QRP Group Net, 0130 Z - 7122 kHz
May, 2017 at 01:15:05Z
Born in People's Republic of China to operate
continually at 450 VDC.
Passed suddenly and in a spectacular manor while
operating at approximately
We also sadly report the associated
passing of two 1 Ampere fuses and one
#2 ) Suddenly, 01:15:06 Z one 6X5GT/G CHS/Jan rectifier
6X5/GT/G/JAN/CHS served proudly during the World War 2 conflict
the United States Navy.
Two innocent 1 Ampere fuses lost their
lives as a result of the above
Services will be This coming
Wednesday by the P&H Garbage Pick-up Service
be Cooter and Bubba.
Internment will be shortly there-afterwards at The
is the first failure I have had with these small sized fiter caps. I
operating these imports will below heir rated Voltage limits. The
components were in the built-in power supply of a clone-kit of an Ameco
with a Ken-Rad 6V6 tube as a crystal oscillator.
The transmitter was not
being used when the filter cap failed, just minding
it's own business,
awaiting net time.
The current rush took the 6X5/G/GT with it, and it's
rolling off the desk top
and playing Humpty Dumpty didn't help it any at all.
So far, no problems with
the replacement 22 mFd. 450 VDC cap.
kidding aside, have any of you had problems with these type capacitors,
operating well below their operating Voltage, failing? The value and
ratings are well marked, but no manufacturer's info is shown. I
them in small lots off of E-Bay purchases, or the filter cap
the kit - I forget.
Due to failure with 50+ year
old paper filter caps in older boat anchor rigs,
I routinely replace the
filter caps and also add a fuse before ever
transmitting the first dot with
them. I had hoped that operating well below
it's Voltage rating would help,
but it didn't.
Any comments on similar incidents would be
Sam Neal N5AF
Celebrating 60 Years In
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