On 11/21/2020 4:29 AM, Richard R. Pope wrote:

Hello all,
I have probably developed cancer. I can't get in for treatment. I have enough lumps in my body that it probably wouldn't make a difference. So more than likely I am dying. I am asking for everyone's help. I am selling off all of my processions and simplifying my life before I die. I don't want to see this stuff end up in the landfill. Please help out a dying old man?
I have a Tektronix 465B Scope with four probes for sale. A HP 16700A LA with 5 16555D LA cards and all of the cables. There is a 16701B Expansion box and the interconnect cable. There is an external SCSI drive box with a CD rom and a ST318417N drive in it. There are a bunch of micro probes for the LA. A monitor, keyboard, mouse, manuals, and CDs. I also have a very large collection of electronic components in over 40 storage cabinets. There are also a lot of books on electronics.
I am asking $250 plus the shipping on the scope. This shipping won't be cheap. $500 plus shipping for the LA. Again shipping will be very expensive. It will take five boxes to ship the LA. I will deliver the scope and/or LA to any where in the lower 48 for the cost of shipping. $500 for the components, cabinets, and books. Shipping is not possible. So it it have to be local pick up. Bring a truck and trailer.
PP F&F, Cashiers Check, or Postal Money Order. Please contact me off list.
GOD Bless and Thanks,
rich!
Happy Thanksgiving!

On 11/21/2020 5:01 AM, John Shadbolt wrote:

Hi,

Are there many Tek units that use multi-section electrolytic capacitors? I came across this company that have a range of new caps available and can make custom orders, I've not used them but would welcome any feedback:

https://hayseedhamfest.com/

Regards,
John

On Thu, Nov 19, 2020 at 6:28 PM Walter Hunter <jonde720d@gmail.com> wrote:

Hi:
I m interested in the 465.
Wallaby

On Thu, Nov 19, 2020 at 9:47 AM Michael W. Lynch via groups.io <mlynch003=
yahoo.com@groups.io> wrote:

I would like to hear more about the 465's

--
Michael Lynch
Dardanelle, AR

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Colin Herbert via groups.io
Sent: Friday, November 20, 2020 1:09 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Looking into Tekscopes

What do you mean by "getting Tekscopes"? If you are hoping to become a member of the Forum, you need to write a sort-of resume/justification and send it to the Moderator. If you mean buying Tektronix oscilloscopes, search eBay.
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of michal.gordon via groups.io
Sent: 18 November 2020 19:22
To: TekScopes@groups.io
Subject: [TekScopes] Looking into Tekscopes

Hi everyone.
I'm looking into getting Tekscopes. Any thoughts or tips on how to go about it?

Thanks,
Michal













--
Dennis Tillman W7pF
TekScopes Moderator

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dennis
Tillman W7pF
Sent: 19 November 2020 22:25
To: TekScopes@groups.io
Subject: [TekScopes] LAST CALL for Peter Keller's Book and Current Orders I
have

This is a last call for Peter Keller's fabulous book. I will accept orders
until Friday evening my time. At present I have orders for 75 books.
At that time I will publish the final list of people I have received an
order from and I will explain how to make payment.
Below are the people who have been placed on Peter's book order. Please
confirm your name is on this list.

If you have missed all of the excitement here is a summary
Pete Keller (from Tektronix) is prolific writer about cathode ray tubes and
many other kinds of display technologies.
He published a very detailed book on the subject in 1991 which I highly
recommend. The book title is:
"The Cathode Ray Tube, Technology, History, and Applications", Peter A.
Keller. 320 p.
ISBN 0-9631559-0-3;
TK7871.73.K46;
621.3815'42-DC20

I paid $70 for my copy years ago when I bought it from Peter. There is a
copy of his book currently on eBay listed for $650!!!
Peter's book is still available in hard cover and he has copies of it to
sell to us.
Because of recent interest in it from TekScopes members I went out on a limb
and asked Peter if a discount would be available for our members if we
bought enough books to make it worth his while and if I did all the work for
him.
He agreed and offered our members a huge discount. The cost will be $30 +
shipping.
I am hoping I can even get him to autograph each copy.
I promised Peter I would keep his effort to an absolute minimum by
collecting the names and addresses, payments which I would send to him in
one lump sum; then when he ships all the books to me I will mail each book
for him.

The cost for a book going anywhere in the US is $30 + $4 Media Rate Postage
+ $3 for supplies and my time. The total will be $37.00.
The cost for orders overseas will be $30 + approximately $35 for Flat Rate
International Priority Mail (this includes tracking).

If you want a copy of Peter's book send your mailing address to me OFF-LIST
at dennis at ridesoft dot com. INCLUDE YOUR ADDRESS.

These are the orders I have as of 2:15PM (UTC-08:00) Coordinated Universal
Time-08.
If your name is not on this list then I missed your order (my apologies) so
resend it with your address.

UNITED STATES ORDERS
Eric Spendel Fairfield, OH 45014
Dave Daniel Mims, FL 32754
Chuck Azzalina Perkasie, PA 18944
Jean Paul Novato, CA 94947
Kurt Rosenfeld Ossining, NY 10562
Vince Vielhaber K8ZW Oxford, MI 48371
Stan Perkins N6BYU San Diego, CA 92109-2348
Bruce Lane Kent, WA 98030-8803
Mark Huffstutter Seattle, WA 98115
Joe Rigdon Oviedo, FL 32765
Jeffrey S. Dutky Silver Spring, MD 20901
Larry Snyder Springboro, OH 45066-9761
Byron Hayes Jr. WA6ATN Toluca Lake, CA 91602-2914
Michael Drum Fanwood, NJ 07023-1008
Jack Reynolds Howell, MI, 48843
Phil Erickson Clinton, MA 01510
Edward Oscarson New Hartford, CT 06057
Steve Berg Casselberry, FL 32707
Charles Daves Aurora, CO 80015-1422
Chuck Harris Damascus, MD 20872
John Malec IV Northglenn, CO 80234
Marvin Moss Marietta, GA 30064
Tom Norman Escalon, CA 95320
Bill Lavick WA2SMF Edwards, NY 13635
Jeff Frantzen Olathe, KS 66062-3693
Glenn Little Goose Creek, SC 29445
Mark Vincent N. Chesterfield, VA 23236
Lance Lieberman Albertson, NY 11507-1022
Steven Horii Bryn Mawr, PA 19010-1226
Charles Nalley Burien, WA 98166
Carl Miles Rio Rancho, NM 87124
Larry Schneider Otis, ME 04605-7652
Dennis McCreery Bellevue, WA 98008
Tim Laing Lima, OH 45801-4644
Chris Wilkson Detroit, MI 48206
Timothy Koeth Brandywine, MD 20613
John Griessen Albuquerque, NM 87107
Greg Muir Great Falls, MT 59405-3144
Kurt Swanson Wilton, CA 95693-9765
Bruce Gentry KA2IVY Mattydale, NY 13211
Peter Brown Broomfield, CO 80023
Tim Pierce Cottage Grove, OR 97424
Bob Darlington N3XKB Los Alamos, NM 87544
Hugh Vartanian Littleton, MA 01460
Richard Brittingham W4MCD Edenton, NC 27932
Jim Rawlings AF6VF Livermore, CA 94550
Monte Meredith Reno, NV 89511
Chris Loggans Haymarket, VA 20169
Steve Bates Concord, MA 01742
John Glass, O'Brien Electric Dallas, OR 97338

INTERNATIONAL ORDERS
Sigurdur Asgeirsson CANADA
Shaun Merrigan CANADA
Bill Perkins, PEARL, Inc. CANADA
Dan Gajanovic CANADA
Andy Guelzow VA7NNM CANADA
Simon Jarman FRANCE
Christoph F. Bruggaier GERMANY
Heinz Breuer GERMANY
Jan Wuesten GERMANY
Red Dot Finder THE NETHERLANDS
Leo Potjewijd THE NETHERLANDS
Mario Giganti I1CWZ ITALY
Colin Herbert UNITED KINGDOM
Alan Ainslie UNITED KINGDOM
Robert Angell UNITED KINGDOM
Thomas S. Knutsen NORWAY
Jared Cabot JAPAN
Gangyi, Le SINGAPORE

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of michal.gordon via groups.io
Sent: 18 November 2020 19:22
To: TekScopes@groups.io
Subject: [TekScopes] Looking into Tekscopes

Hi everyone.
I'm looking into getting Tekscopes. Any thoughts or tips on how to go about it?

Thanks,
Michal

On 11/19/2020 11:40 PM, Ed Breya via groups.io wrote:

I agree - nothing to lose. BUT, be sure that's the problem first. If you're assuming the heater is open because the CRT doesn't light up, or measuring the heater through the wiring and socket, you don't really know for sure. Before such a drastic action, measure the heater right at the CRT base pins to be sure. Then there's nothing to lose.

Ed

On 11/19/2020 18:55, Jeff Dutky wrote:

Dr. Lee, and Harvey White,

Thanks for the informative responses, that does make more sense, especially in light of an impulse input, which I understand implies a broad spectrum of underlying frequencies including very high frequencies (in order to reconstruct the impulse from the elements of the Fourier decomposition). Those high frequencies, which are required to get a good steep rise time, will also show up as high frequency ringing after the rise and fall, which messes up the fidelity to the overall shape of the pulse.

This also makes sense to me from a mechanical analog to the electrical signal: if you have a damped spring system you can either get fast changes in the displacement, but have lots of wiggling afterwards, or you can have very little wiggling but the displacement is slowed down a lot. A loose piston attached to the spring lets the spring change length very quickly, but doesn't do much to damp overshoot and undershoot or to dissipate the energy in the spring after the change in length, but a stiff piston which will rapidly stop the under/overshoot will also make it much harder and slower the change the length of the spring.

On 11/19/2020 18:53, Marvin Moss wrote:

*I wonder if anyone has tried a large capacitor and high voltage to weld an open filament in a CRT?*
*And how did it work out?  Supposedly a cap with 2 or 3 hundred mfd and a high voltage to create an arc in the open filament will create a bridge in the filament and will make it conduct and form a new place where the filament can come back to life in the CRT.  Your thoughts on this??
*

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of greenboxmaven via groups.io
Sent: Thursday, November 19, 2020 7:11 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Open filament on CRT

What you describe was often used as a last resort to salvage a television picture tube. It is very unlikely to work if the break is in
the middle of the heater winding. It did sometimes work when the end
of the heater wire had broken loose from the strap or lead that carried the current to it. Not burned in two, but hanging loose. It was not always a permanent repair, thermal stresses to the weld would often cause it to break loose again. A similar technique was used to weld a loose connection back to the cathode cup or first grid. People have been zapping bad jugs for decades, success and longevity are very unpredictable.

Bruce Gentry, KA2IVY

On 11/19/20 9:53 PM, Marvin Moss wrote:

*I wonder if anyone has tried a large capacitor and high voltage to
weld an open filament in a CRT?* *And how did it work out? Supposedly a cap with 2 or 3 hundred mfd and a high voltage to create an arc in the open filament will create a bridge in the filament and will make it conduct and form a new place where the filament can come back to life in the CRT. Your thoughts on this??
*

--
Dennis Tillman W7pF
TekScopes Moderator