Sam,
Your HV encounter confirms my long held concern about the Millen HV plastic
connector. Appears to not be "hermetic sealed" with respect keeping the HV
inside, if a hand is ever brushed over the outside. Another failure mode I saw
for that connector, if the environment allows motion the B+ cable, as I
recall the plastic Millen connector shell is captured to the cable, by the
soldered large diameter center pin, to the relatively narrow conductor, passing
through a small hole in the shell. If that soldered connection fractured,
through fatigue flexing, etc the Hot, raw end of the B+ lead will pop out of
connector hanging in mid air, energized. Because of that concern, I got
(already had) some neat aftermarket shielding tubing. It was a finely made,
loose woven, metallic "tube" that looked and behaved like a chinese finger trap
toy. I ran that the whole length of the Drake L-4B B+ lead from the PS chassis
to, AND OVER the Millen connector, so as to have a metal shi
eld completely surrounding the millen connector, to its base, and bonded to
the L4 Chassis. You could use a bananna plug Jack termination for the shield
wire to make for easy connects, and disconnects.
Best Regards,
73, de Pat Barthelow AA6EG
> From: sam@owenscommunication.com
> To: david.kirkby@onetel.net; amps@contesting.com
> Date: Tue, 14 Sep 2010 08:30:43 -0400
> Subject: Re: [Amps] SHV connectors great, but where to find coax?
>
> I think the right answer may be to MARK "HIGH VOLTAGE" Even when unplugged
> or some such. One of the "fit and proper" connectors for HV got me once and
> I was very lucky. I had a rack-mount Henry 2002 220Mhz amp at a remote
> location. It has the HV PS in one enclosure and the PA in another. Between
> them was the HT lead that looked like a spark plug cable and had the
> Bakelite screw-on type connectors.
>
> I reached behind the PA to disconnect the BNC for the RX'er to hook up a
> service monitor and got the surprise of my life. The palm of my left hand
> brushed the HV "Proper Connector" and it arched into my hand and exited my
> elbow that was rested on a basement wall. Had by fate my elbow at the
> wall...the exit may have been my through my shoe. I had a painful hole in my
> hand for months and a numb arm for a few days. Also had a nasty exit wound
> on the elbow.
>
> My point is that there may not be any "SAFE" HV connector for the
> uninitiated. Marking things with stickers spelling it out may make the whole
> "which one" discussion unimportant. Good marking should avoid problems.
>
> Just my 2 cents,
> N9FUT
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Dr. David Kirkby
> Sent: Tuesday, September 14, 2010 6:51 AM
> To: 'AMPS'
> Subject: Re: [Amps] SHV connectors great, but where to find coax?
>
> On 09/13/10 05:46 PM, DAVE WHITE wrote:
> > "The Engineering Council in the UK would I expect strip someone of
> > their CEng status if an individual proposed such silly things."
> > But let's face it, the UK is becoming just about the most laughable
> example of the socialist Nanny State taken to the most extreme
> interpretation of the concept. I doubt if Henry V and Winston Churchill are
> turning in their graves when they see modern Britain, I'm sure that they're
> spinning like steam turbines.
> > This is the country where the Elf'n'Safety nazis (including rooms full of
> overpaid, interfering, sanctimonious buffoons like the Engineering Council)
> invade every aspect of our lives. I say Bollocks to the lot of them. If I
> want to build an HT lead with a PL259 on the end of it, then that's what
> I'll damn well do and I personally will take the risk. If I plug one end
> into the 6kV supply and the other into my right nostril then that's my own
> fault and my own responsibility, right?
> > Dave G0OIL (not SK, amazingly)
>
> cp $above-email /dev/null
>
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