Date   

T220 Question

regman10
 

I the EBC configuration always the same on T220 packages?


scope information

Richard Oglebay <richardoglebay@...>
 

Hello please stop sending tech info at this time being I do not have time to read it Thank You



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Tektronix TC2000

chrism3667
 

Hello group...by any chance does anyone have any information on the
portable computer known as the TC2000? Any info would be available,
but especially user manuals and schematics, in any form. Thanks.


I need two small parts for a 561A

n4buq <n4buq@...>
 

Anyone know where I can get the small plexiglass part that goes under
the display that aids in the screen illumination? It mounts in front
of the two panel lamps and is held in place with a long, flat spring
(I need the spring too).

Thanks,

Barry - N4BUQ


464 manual

Darrin Conniff <djconniff@...>
 

Hello everyone,
Is there a kind soul out there who has a pdf of the 464 manual I could purchase?
I have one here needing repair as soon as possible.
Thanks in advance,
Darrin


Fw: Tellabs Auction of Test & Measurement & Power Distribution Equip

Benoit Bissonnette <benoit.bissonnette@...>
 

DoveBid Auction Notification
Hi everybody,



I just found this web auction.



Just click on the "view equipmentcatalog" on the right to see all the equipment for sale.



Maybe some of you will find good stuff to buy.



Regards,



Benoit




























Tellabs, Inc. - Sale #5 Auction of Quality Test and Measurement Equipment, plus Inventory and Power Distribution Equipment


Click Here to View


DoveBid, Inc., a global provider of capital asset auction and valuation services, will be conducting an Online Auction of Quality Test and Measurement Equipment, plus Inventory and Power Distribution Equipment. Auction is by order of Tellabs, Inc. of surplus assets to their continuing operations. Place your bids from the comfort of your computer.





Featured Items
Sale Details


Assets from Montreal, Canada location:

a.. Over 200 Test and Measurement Pieces
b.. Omega Multiscan 1200
c.. HP 8401A VXI Mainframe & Spectrum Analyzers
d.. Tektronix Color Logic Analyzers
e.. Vytran Fusion Splicer and Fiber Recoater
f.. HP Signal Generators & Cerjac Test Sets
g.. Anritsu SDH Sonet Analyzers
h.. Wandel Golterman Advanced Network Tester / Line Simulator
i.. Lorain Vortex Reltec Power Distribution System
(Up to 10,000 Amp)
j.. And much more!


Asses from Bolingbrook, IL USA location:

a.. Over 100 Test and Measurement, Snow Blowers, Material Handling, Lab Benches and Furniture
b.. Siemens and JOT Workstations & Feeder Tables
c.. (4) Remstar Shuttle Retrieval Systems
d.. (3) Fuji IP-3 Feeder Carts
e.. (5) Agilent 8648A Signal Generator
f.. (4) HP 54825A / 54835A Infinium Oscilloscopes
g.. (5) HP Universal Counters 53132A
h.. HP 83480A Digital Coomunications Analyzers
i.. (2) Crown 3,000 lb stock pickers
j.. And much more!
a.. 1-Day Online Auction
b.. Bidding Begins: May 12, 2004 at 12:00 am (PDT)
c.. Bidding Ends: May 12, 2004 at 2:00 pm (PDT)
d.. View the Equipment Catalog
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f.. Montreal, Canada
· Bolingbrook, IL USA

· For further information, please contact:

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Phone: +1 (800) 665-1042

· View complete details



--------------------------------------------------------------------------

Also bid in these upcoming auctions


Scientific-Atlanta, Inc. - Sale #2
PCB Assembly and Test & Measurement Equipment
May 5, 2004
Kellner, Inc. DBA Test Technology Associates
PCB, Test and Measurement Equipment, In Circuit Testers and related equipment Surplus to the Operations of TTA
Private Treaty Sale - GOING ON NOW!


SEMEX-20
Semiconductor and Electronic Test & Measurement Equipment Exchange
May 18, 2004
Chorum Technologies Sale #1 Webcast Auction
A Multi-Million Dollar Webcast Auction of a Complete 112,000 Sq. Ft. State of the Art Fiber-Optic Component Research and Manufacturing Facility, Featuring: Lightwave Optical Test & Measurement, Optical Inspection/Analysis, Fusion Splicing, and Much More
May 19 & 20, 2004



--------------------------------------------------------------------------

About DoveBid
DoveBid, Inc. is a global provider of capital asset auction and valuation services to large corporations and financial institutions. DoveBid delivers an integrated set of services to its customers for the disposition, valuation and redeployment of their surplus capital assets. DoveBid offers an array of auction services to meet its customers' specific needs, including Webcast auctions broadcast live over the Internet, on-site-only a uctions, Internet featured online auctions and privately-negotiated sales. DoveBid Managed Services offers clients a hosted, Internet-based application to monitor surplus assets inside the corporation. DoveBid Valuation Services uses its database of transaction information to provide valuations of capital assets for financial institutions and large businesses.

Headquartered in Foster City, California, DoveBid has over 65 years of auction experience in the capital asset industry with more than 40 locations throughout North America, Europe and the Asia-Pacific region. More information on DoveBid can be found at http://www.dovebid.com or by contacting company headquarters at (800) 665-1042 or +1 (650) 571-7400. CA Bond #69567717. DoveBid, Inc., 1241 E. Hillsdale Blvd., Foster City, CA 94404

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Transistor help

regman10
 

Anybody have any data or substitutes for a GE7921 power transistor
used in the HV supply for an SC504?


Re: 7B15 vs 7B92A

Craig Sawyers <c.sawyers@...>
 

In looking at a stack of my surplus 7000 series plug-ins I note
that I have
a 7B15 and 7B92A (qty 3). Is there any real advantage that a 7B15
has over
a 7B92A?


Dave
I have both, and they both have their uses. The 7B92A goes to 500ps/div and
the 7B15 to 200ps/div. There were actually two versions of the 7B92A - the
earlier one uses TD's in the trigger circuits (the usual arming and
recognition arrangement), and the later one a hybrid. I've fiddled with
both, and performance seems identical; I guess Tek went the non-TD route
when TD's were no longer going to be produced by MA, GE and RCA. The 7B15
uses hypcon mounting ceramic flat pack hybrids throughout.

I think that only the 7104 can cope with 200ps per division; the 7B92A was
really intended for the three-bay R7903, and also was the fastest dual
timebase that would go in the R7103 too.

I'm in fact looking for a 7B10 to go with my 7B15 to compete the 7104 set
up - at the moment I have a 7B92A in one slot and a 7B15 in the other.

Oh yes - the other thing you don't get on the 7B92A is variable trigger
holdoff, which is a feature that I find surprisingly useful.

Craig


Re: 7B15 vs 7B92A

Windsor Chan
 

The 7b15 has faster sweeps and an New and Improved(tm) ramp generator
But it is a single timebase whereas the 7b92a is a dual job. So it
really boils down to what type of signals you like to look at.

Windsor Chan


In looking at a stack of my surplus 7000 series plug-ins I note that
I have
a 7B15 and 7B92A (qty 3). Is there any real advantage that a 7B15
has over
a 7B92A?


7B15 vs 7B92A

Dave & Lynn @ Artek Media <manuals@...>
 

In preparation for an upcoming move I am thinning out my equipment pile.

In looking at a stack of my surplus 7000 series plug-ins I note that I have a 7B15 and 7B92A (qty 3). Is there any real advantage that a 7B15 has over a 7B92A?


Dave





Dave & Lynn Henderson
ArtekMedia
High Resolution Scans of Out-of-Print Technical Manuals
manuals@artekmedia.com
603-465-7891


Re: Book Ideas

Scott Newell <newell@...>
 

At 12:23 AM 4/28/2004 , Craig Sawyers wrote:

From an earlier era, The Radiotron Designer's Handbook, preferably edition
4. Out of print.
Good one! It's still available:

http://www.audioxpress.com/bksprods/books/cdrdh.htm

I think there's a paper reprint too (maybe in two volumes?), but I'm not
having luck locating it right now.


newell


Re: 7904 readout 'jitter'

 

--- In TekScopes@yahoogroups.com, "pe1fbo" <sh331182@1...> wrote:
Hi All,

I have a 7904 where the on-screen readout vertical position is
slightly depending on the vertical trace position.

On a steady beam this is not a problem but if you put the horizotal
time base in alt, the readout becomes bouncy. I think the problem
is
in the unbalance of the vertical amp, but would like to hear some
other people about this 'problem'

Thanks,

Fred de Vries
-------
That could be due to a poor mid or lo frequency response. Check
different frequencies of squarewaves and you might see that it's not
perfect. It will also show up as a slight cross talk between
compartments when using chop and for example have a large signal on
Left and nothing on Right. In the 7904, like in most of 7k
mainframes, there are several selected RC combinations in the output
amp that, if reselected, most likely will cure this.
/Zenith


Interesting pulse gen

Craig Sawyers <c.sawyers@...>
 

Hi all

I just bought what seems to be an interesting TM500 series unit on eBay. It
is called a High Amplitude Pulse Generator, and I've really just bought it
almost out of curiosity. It has a switched amplitude that goes from 200mV
to 100V, with a variable control too. It also has a variable pre-trigger,
and a charge line connector which is either an SMA of BSM. Then it has
BNC's for pulse out and pre-trigger out.

It sounds like a reed pulser (to get the high amplitude) with a pre-trigger
generator, so I'm expecting something quite fast. Or it could be an
avalanche pulser with amplifier. Both of these would explain the need for a
charge line.

I'll let you all know what this beast is when it arrives. If you want a
peek, it was ebay number 3811293971.

Craig


Re: 7704a repair adventure

Craig Sawyers <c.sawyers@...>
 

Based on the suggestions I've found a pair of 151-0127-00 <-> 2n2369.
Would be close enough for the time being?


Windsor Chan
I'd be tempted to just shove them in and see what happens - but don't blame
me if there is a puff of smoke from somewhere! They have lower Ft = 500MHz
and higher Coe = 4pF, and it may be that they oscillate, and you'll soon see
that in the trace ;-)

There are a lot of junker 7704A's out there, so try Sphere or Deane Kidd for
the real part. I picked up two non-working 7704A's with PI's (including a
couple of 7A13 diff comparators!) at a hamfest a couple of months ago for
�90UK, but they were easily fixed and I'll be listing them on eBay as
functional units in due course.

Craig


Re: 7704a repair adventure

Windsor Chan
 

Hi

Based on the suggestions I've found a pair of 151-0127-00 <-> 2n2369.
Would be close enough for the time being?


Windsor Chan


Re: 7704a repair adventure

Craig Sawyers <c.sawyers@...>
 

Thank you for the advice.
The device in question is in round plastic case.
Looks like a UFO :)
Windsor Chan
I know the sort of case you're talking about - it is called TO105 or TO107,
circular with a shiney domed top. My 7704A has T092 style case ones -
shaped like a letter D.

Craig


Re: 7704a repair adventure

Windsor Chan
 

Thank you for the advice.
The device in question is in round plastic case.
Looks like a UFO :)

Regarding the pairing up, that is a good idea
because if one tranny starts to run out of steam
before the other, there would be an imbalance.



Windsor Chan


Re: Book Ideas

Craig Sawyers <c.sawyers@...>
 

After suggesting to Scientific American Book Club that they need
some good electronics books in their club, I was contacted by the
Senior Editor of the club, asking if I have any suggestions.
Anyone read any good books lately?
Handbook of Analog Circuit Design, Feucht (ex Tek designer). Out of print.
The Art of Electronics, Horowitz and Hill. Very much in print.
From an earlier era, The Radiotron Designer's Handbook, preferably edition
4. Out of print.
Op-amp Cookbook, Jung. In print.

Craig


Re: Book Ideas

Scott Newell <newell@...>
 

At 10:05 PM 4/27/2004 -0700, Darrin Conniff wrote:
Hello Everyone,
After suggesting to Scientific American Book Club that they need some good
electronics books in their club, I was contacted by the Senior Editor of
the club, asking if I have any suggestions.

All the Tek concept series.
The two Jim Williams edited analog design books.
The Bob Pease book.
AoE.
Analysis and Design of Analog Integrated Circuits (Gray and Meyer).


newell


Book Ideas

Darrin Conniff <djconniff@...>
 

Hello Everyone,
After suggesting to Scientific American Book Club that they need some good electronics books in their club, I was contacted by the Senior Editor of the club, asking if I have any suggestions.
Anyone read any good books lately?
Let me know, and we'll see if we can help them get some quality electronics books, maybe help interest some future engineers...
I won't mention any names to the editor, just that the suggestions came from members of this list.
Thanks,
Darrin

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