[R-390] R-390 Digest, Vol 212, Issue 6
kellerfamily01 at charter.net
kellerfamily01 at charter.net
Fri Jan 7 23:30:57 EST 2022
What makes it unusable? If it is a 10 plus acre parcel, there must be
some part of it that could be built on and the rest could just be left
wild. Are you saying that the 10 acres is not all in one piece? If so,
then how many oieces and how big is the largest oiece? Even if the 10
acres is a number of vacant lots that add up to ten acres, it still
might be a good investment. I could build on one of them and save the
rest for future resale.
POP
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Sent: Thursday January 6 2022 12:17:52PM
Subject: R-390 Digest, Vol 212, Issue 6
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Today's Topics:
1. Re: Tube removal (wc4g at knology.net)
----------------------------------------------------------------------
Message: 1
Date: Thu, 6 Jan 2022 12:16:48 -0500
From: "wc4g at knology.net"
To: Barry
Cc: R-390 Mailing List , Tisha Hayes
Subject: Re: [R-390] Tube removal
Message-ID:
Content-Type: text/plain; charset="utf-8"
Barry and all, here are the tube pullers we all really want!
I am continuing to look.
Regards,
Don WC4G
On Thu, Jan 6, 2022 at 11:13 AM Barry wrote:
> In a pinch (no pun intended), I would think that a pair of common
kitchen
> scissor-style tongs with some shrink wrap or thin rubber tubing
wrapped
> around the ends would work as well.
>
> I have some of the older Tektronix items (Type 106, Type 191 as
well as a
> Type 184 which uses nuvistors). The 106 and 191 have tubes with
IERC
> shields. I tried to remove one of those shields in the 106 and I
simply
> could not pull it loose. I've used IERC shields before and they can
be
> tough to pull when they're locked to the tube base (which they
should be to
> work properly) but I simply could not pull hard enough to remove
them in
> the 106!
>
> Thanks,
> Barry - N4BUQ
>
> ----- Original Message -----
> > From: "Tisha Hayes"
> > To: "R-390 Mailing List"
> > Sent: Thursday, January 6, 2022 9:52:34 AM
> > Subject: [R-390] Tube removal
>
> > Those "Chinese finger-puzzle" type of grips are still used but on
cables;
> > You will find them for suspending coax cables inside of cellular
towers
> > from the top and along the midspan. They are known as "Kellum
grips".
> >
> > Now, a Kellum grip used for cabling might be a bit too
"aggressive" but
> > glass is amazingly resilient when forces are applied equally
around their
> > radius. You would need to find a light-duty one.
> >
> > The gorilla tape is a great idea; You can always remove the
adhesive from
> > Gorilla tape with the universal solvent... WD-40.
> >
> > Another alternative would be to find an "IERC tube shield". Those
are as
> > rare as hen's-teeth and quite valuable in the tube-radio market.
They
> are a
> > black metallic shield that slides down over the top of a tube and
are
> used
> > for shielding and thermal dissipation. They have beryllium-copper
> > fingerstock inside of the shields that tightly grabs the tube
glass and
> > couples the heat to the metal shield. If you could slide an IERC
shield
> > down over the tube you could then grab the top lip of the shield
with a
> > pair of needle-nose pliers and rock the tube up and out of the
socket in
> a
> > confined space.
> >
> > A bunch of years past I did a writeup on the thermal improvements
in a
> > Hammarlund SP-600 (posted on a different list) between unshielded
tubes,
> > silver-metallic shielded tubes and IERC shielded tubes on an
SP-600 that
> > was installed in a closed cabinet. It involved thermocouples
attached to
> > the chassis and key components in multiple locations, regulated
AC
> > supplies, temperature controlled rooms and a few weeks of data
> collection.
> > The end result was that the IERC shields did knock down the
temperature
> of
> > the chassis by an average of 5c to 15c. The purpose was in how
such
> > temperature reduction would have on extending the life of
components like
> > electrolytic capacitors and on frequency drift of the receiver. I
do not
> > even have the writeup or data any more; it was lost in one of the
many
> hard
> > drive failures that we all experience with computers.
> >
> > I did end up buying a significant quantity of IERC shields and
they are
> > still installed on my SP-600-JX17, R-390A and the much despised
(by me)
> > CV-591 SSB converter.
> >
> > *Ms. Tisha Hayes*
> >
> > *AA4HA*
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