[R-390] Tube removal

[Kenneth Crips]

Here is what you need. 

https://www.psaudio.com/products/vacuum-tube-puller/

Ken

Sent from my iPhone

> On Jan 6, 2022, at 10:14, donwc4g at gmail.com wrote:
> 
> Barry and all, here are the tube pullers we all really want.
> I am continuing to look for more.
> Regards,
> Don WC4G
> 
> 
>> On Thu, Jan 6, 2022 at 11:13 AM Barry <n4buq at knology.net> 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" <tisha.hayes at gmail.com>
>>> To: "R-390 Mailing List" <r-390 at mailman.qth.net>
>>> 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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