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As a corollary topic to HV connectors... we forum denizens recently
were told about a 3500 volt Hipot tester available on epay for only
around $20 (the ones coming directly from china, for some reason, seem
rated to 3800 volts instead). 3500V isn't quite enough for what the OP
wants/needs (he wanted at least 5 kV); but it reminded me that 3 or 4
years back, I was building a 10+ kV Hipot tester and thought I would
use a neon sign transformer. However, those I found on epay were not
only old and relatively-decrepit-looking, the sellers also wanted
either both arms and a leg or both legs. For some reason, I did a
search on epay for "Hipot tester" and lo and behold: a bunch of
sellers were marketing 10+ kV, very-low current adjustable power
supplies in the $25-$35 range. I bought one... it's a PC board about
4" by 1-1/2" with a switching inductor or transformer on it and runs
from 12VDC. You have to wire a pot to the board to get the adjustable
output, completely adjustable from zero to over 12 kV DC at at least a
couple mils, far more than enough for a Hipot tester. Even has
short-circuit protection 8-)
I would strongly suggest a Hipot tester be used to confirm the HV
integrity of any cables or connectors. You can, obviously, also use it
to hipot your old tubes, vacuum variables, and vacuum relays 8-)
Steve, K0XP
On 11/21/2024 5:24 PM, Jeff AC0C wrote:

So239/Pl259 are questionable after 3KV. Been there, tried that.
Don't like the Millen HV because the tip is exposed IIRC.
The SHV works well for moderate voltages but it's not super rugged.
Looks more or less like a BNC variant on the shell. These are harder
to get these days as they seem to have fallen out of favor for more
modern safety-oriented specialty connectors. But for ham use, they
may be what you are needing.
GL!
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com [1]
On 11/21/2024 6:49 PM, Mike Sawyer via groups.io wrote:
If you were to 'sing the praises' of those Millen HV connectors,
which are
advertised up to 7KV, Shane, WP2ASS, might bop you on the nose! I
have used
them to 2KV but I would go much above that because they lack a lot
of
protection where the wire goes into the connector itself. I have
some SHV
that require RG-58 or a reasonable facsimile thereof. Recently I
used
these:

One of the companies that makes a Megger uses it to 10KV. I'm only
using it
for 2KV but the bare conductor is buried deep inside the ABS probe
so that
it isn't exposed. The only issue I see is that the manufacturer
doesn't
state the current. It didn't bother me since I was looking at a max
of about
300mA on my modulator. However, YMMV!
Mod-U-Lator,
Mike(y)/W3SLK
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf
Of Amp Guy Llc
Sent: Thursday, November 21, 2024 6:54 PM
To: [email protected]
Subject: Re: [ham-amplifiers] Need advice on HV connectors
Google Alden High Voltage connectors
On 2024-11-21 16:16, Dave w6de wrote:
Using connectors and cables for other than their original intended
purpose is an invitation for a potentially fatal disaster in the
future.
Don't depend on haphazard grounding for HV power return, run a
separate dark cable for the HV return in addition to having a common
shack grounding system.
Use bright red HV cables and purpose built HV connectors. Millen HV
connectors have been used in Amateur radio applications for a long
time.

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illen+High+voltage+connector&_sacat=0&_odkw=millen+HV+connector&_osacat=0

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73,
Dave, w6de
From: [email protected] <[email protected]> On Behalf
Of
Kim Herron via groups.io
Sent: 21 November, 2024 18:06
To: [email protected]
Subject: [ham-amplifiers] Need advice on HV connectors
HI all,
Thanks for reading the mail. I have acquired a home brew amp
and power supply that is missing its HV cable. I'd like to change
both
of them to one style since they are both different. Jack Schutt
K9GT
originally built this. I'd thought about using SO-239/PL-259's that
are
Teflon with RG-8 inner conductor cable as the HV wire and packing
the PL-259's with RTV-108 and sleeving the wire with GOOD Belden
heavy shrink tube with sealant. Does that sound like it would hold
5 KV since that's what Jack built the power supply too? Thanks
for the input and reading the mail.
Kim Herron W8ZV
w8zv@...
www.goldenradioservice.com [3] [2]
616-677-3706
Links:
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illen+High+voltage+connector&_sacat=0&_odkw=millen+HV+connector&_osacat=0

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[3] /g/ham-amplifiers/message/40718
[4] /mt/109709173/8135091
[5] /g/ham-amplifiers/post
[6] /g/ham-amplifiers/editsub/8135091
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/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
--
See my QRZ.com page at
Links:
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[4] /g/ham-amplifiers/message/40723
[5] /mt/109709173/8135091
[6] /g/ham-amplifiers/post
[7] /g/ham-amplifiers/editsub/8135091
[8] /g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy