开云体育

Is there someone here that can help me with a 7L12 that has suddenly lost sensitivity by about 50 dB? The problem seemed erratic
at first. A couple times when I first turned it on it worked OKat first then lost sensitivityafter a few minutes. At least one of these
times it was really intermittant for a minute or two before going out - I could wiggle the input connector and make the signal level jump
up and down. Now the problem is perminant no matter what, I have examined the connectors and cables inside the unit but can find
nothing that causes the intermittant. I don't think the first mixer was blown, I am very careful about that and was looking at a source I
often look at when the 7L12 first died.

Any help?

Mike in Indy

Working on a DM5010 multimeter it has a bunch of little square button
switches on the front panel, a few are sticky, should I try and clean
them or lubricate them ? And how with what ? I have it completely
apart they don't apear dirty, they are plastic, I beleive the same are
used on some later scopes. Thanks in advance for any wisdom on this
subject, Jon P.

Gentlemen-

I've acquired an AM503 and am looking for a compatible current probe (DC to 5+MHZ) to use with it. Is anyone aware of a listing of probes or have a recommendation of acceptable models? Thanks in advance for your input.

Phil

Gentlemen-

Is this really an all-male list? Bummer.

I've acquired an AM503 and am looking for a compatible current probe (DC
to 5+MHZ) to use with it. Is anyone aware of a listing of probes or have a
recommendation of acceptable models? Thanks in advance for your input.

Excerpt from my list @ :

Tektronix A6302 DC current probe 50MHz 20A
Tektronix A6302XL DC current probe 17MHz 20A
Tektronix A6303 DC current probe 15MHz 100A
Tektronix A6303XL DC current probe 10MHz 100A
Tektronix A6304XL DC current probe 2MHz 500A
Tektronix A6312 DC current probe 100MHz 20A

I think the XL models may require an AM503B/AM5030 amp, but I'm not sure.

David DiGiacomo
San Francisco, CA

Hi all!

1/2 drop of lubricant on the shaft instantly solved the problem. Pot turns perfectly now --like new. Thanks to each of you who suggested less drastic measures than replacement.

Steve

I would like to inquire if anyone in this fine group of ours has a CRT for
a Tek 2235, or 2236 for sell, or trade.
The part number on the CRT is 154-0861-00.

----------

Darrin
If you don't manage to find a 0861 CRT then in most cases you can use a
0731 tube from a 465/465B/468 which is more likely to be available. However
there are a couple of caveats -

-The 0731 does not have integrally mounted trace rotation coils so the ones
from the old CRT must be swapped over.

-Pin 12 on the CRT base must be reading approx 100v, an early 2235 will
have this but the voltage will be missing on later ones. In this case to
successfully use the 0731 you must add 3 components - CR879, R879 and C879.
The mounting holes for these should already be drilled in the pcb (under
the power supply cover) and they should show on the silk screen print so
adding them is easy. Values are R879 510K 5% 0.25w, C879 Ceramic 0.1uF
200v, CR879 is 400v 750mA and has a Tek part number of 152-0413-00, mfr no
shown as UTR307, but I have successfully used 1N4004 in this position.

...Ben

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A renewed search of my Digikey catalog has part number 381N505-ND. ($13.35). This is a Clarostat 1 Watt conductive plastic linear pot with identical mechanicals to the original, which was also a Clarostat part. I was nervous about the 350 Volt rating, but if my calculations are correct, there is about 326 Volts across that pot in circuit, so it should be fine. Comments welcome.


I am in need of a new "focus" pot for my Tektronix 475 scope, serial number B278849. The part Identifier is R1380. The Tek part number is 311-0075-00. Description is: Res., VAR, NONWIR:
5M Ohm 20% It is a small all metal round pot with a 1/4" bushing an an 1/8" shaft. The pot works electrically but is binding/stuck mechanically. It can be rotated, but it is very, very stiff. I'm afraid of breaking the fiberglass extension rod.

Lubricate the shaft where it enters the body of the pot with contact
cleaner. Turn the pot. Repeat
as necessary.
You will probably find it only takes one or two tries to get enough
penetration to fix the problem.
It is nearly 100% certain that this is all it needs to free it up. I
have never run into a case where this kind of mechanical binding
requires component replacement
Arthur Shulman

Steve Hogan wrote:

Hi all!

I am in need of a new "focus" pot for my Tektronix 475 scope, serial
number B278849. The part Identifier is R1380. The Tek part number is
311-0075-00. Description is: Res., VAR, NONWIR:
5M Ohm 20% It is a small all metal round pot with a 1/4" bushing an
an 1/8" shaft. The pot works electrically but is binding/stuck
mechanically. It can be rotated, but it is very, very stiff. I'm
afraid of breaking the fiberglass extension rod.
Tek, of course doesn't have it, and though it is a simple pot with no
special push-pull switching, etc. 5 MegOhm is not that common a value
any more so I have not yet found a quality generic replacement. I
assume that this pot has linear taper.

Thanks for helping.

Steve Hogan
Can someone out there he





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Yes it is worth doing because I tried just one mispelling and found a
scope. Here's the link:


ViewItem&item=3802275078&category=45005

regards,

Benoit


--- In TekScopes@..., Scott Newell <newell@c...> wrote:

At 10:53 PM 3/7/2004 -0800, Miroslav Pokorni wrote:

That is pretty good tip, I never tried it, but it is worth doing

it.

I used to have a standard eBay search that included a lot of the

common

mistakes. Here's 20 to get y'all started:

tectronix
tektronix
techtronix
textronix
tectronics
tektronics
techtronics
textronics
tectronichs
tektronichs
techtronichs
textronichs
tectronicks
tektronicks
techtronicks
textronicks
tectroniks
tektroniks
techtroniks
textroniks


newell

Hi all!

I am in need of a new "focus" pot for my Tektronix 475 scope, serial number B278849. The part Identifier is R1380. The Tek part number is 311-0075-00. Description is: Res., VAR, NONWIR:
5M Ohm 20% It is a small all metal round pot with a 1/4" bushing an an 1/8" shaft. The pot works electrically but is binding/stuck mechanically. It can be rotated, but it is very, very stiff. I'm afraid of breaking the fiberglass extension rod.
Tek, of course doesn't have it, and though it is a simple pot with no special push-pull switching, etc. 5 MegOhm is not that common a value any more so I have not yet found a quality generic replacement. I assume that this pot has linear taper.

Thanks for helping.

Steve Hogan
Can someone out there he

Greetings All,
I would like to inquire if anyone in this fine group of ours has a CRT for a Tek 2235, or 2236 for sell, or trade.
The part number on the CRT is 154-0861-00.
I received this 2235 from another TekScopes member after I begged on this group for any source of Test equipment in Texas some weeks back.
I was delivered a fine selection of Tektronix equipment, at an excellent price, but this tube seems somewhat elusive.
If anyone has an extra, or a 2235 or 2236 they have stripped for parts, except for the CRT, could you please contact me?
The 'Scope is in pristine condition, except for the CRT, which is obviously at atmospheric pressure.
Best Regards,
Darrin

--- In TekScopes@..., "Rex W. Athey"
<mister_twister@p...> wrote:

In the movie, "Diamonds Are Forever" they have a company

called "Tectronics".
----------
There is actually a real company which spells the name just like
Christian initially did. It's in UK and deals with home electronics.
see:
/Zenith

In the movie, "Diamonds Are Forever" they have a company called "Tectronics". I believe I have it spelled the way they have it in the movie. I'm to lazy to pull out all my James Bond movies (and I have ALL of them!). They have a nice 500 series Tektronix scope in Dr No. They have the infamous Telequipment S51B in both Goldfinger and You Only Live Twice. And they have either a 453 or 454 on the boat that is NOT a chase boat in "You Only Live Twice".

They also have S51B in most of the Gerry Anderson series like "Thunderbirds", There's a nice close up of a 54? (I think it's a 547 or 545) in the opening sequence of Journey to the Far Side Of The Sun. The Real McCoy has a nice 200 series (221?) and I forgot the name of the movie from the early 80's with a girl electronics engineer and her airplane flying boyfriend. In the car outside the lab they had a spectrum analyzer and a Tek scope in their car (Prime Risk seems to come to mind as the title, though it was a "B" picture. And Dark Angel has an RM503 that gets smashed to pieces at the end of the second season (so sad! I use to have 3 RM503's and 2 503's). I wouldn't be surprised if Tek was in Irwin Allen's stuff or the original "Mission Impossible" with Barney Collier. I always drooled at all the gadgets he would pull out each week. There are many more oscilloscopes in TV and Movie land. The Oscilloscope always makes it own statement in a show.

Rex W. Athey
WITF-TV / DTV / FM / Uplink / ITFS / Radio Pennsylvania / Production Truck
Harrisburg, PA (@ 5 miles from "TMI")

At 10:53 PM 3/7/2004 -0800, Miroslav Pokorni wrote:

That is pretty good tip, I never tried it, but it is worth doing it.

I used to have a standard eBay search that included a lot of the common
mistakes. Here's 20 to get y'all started:

tectronix
tektronix
techtronix
textronix
tectronics
tektronics
techtronics
textronics
tectronichs
tektronichs
techtronichs
textronichs
tectronicks
tektronicks
techtronicks
textronicks
tectroniks
tektroniks
techtroniks
textroniks


newell

Change all the filter caps in the power supply - they are getting old and
worn out - that will fix it!
Always use 105C rated caps as they last much longer (the last ones worked
for 20 years).
Regards
Denis Cobley

has anyone seen this when the scope is first turned on
and a signal applied there is what looks like ac
ripple on the top of the trace but after a minute or
so it gradualy shrinks and goes away alltogether is
this a sign of of serious problem everything else
workes fine


thanks ken magers


__________________________________
Do you Yahoo!?
Yahoo! Finance: Get your refund fast by filing online.

(Data I/O), so much more reason to be careful. Possibiliies are infinite and
have to watch for fine print (manufacturer, IC revision, algoritham revision
etc.), or you will fry the PROM.

Regards

Miroslav Pokorni

I did not bid against you, but not for lack of want, it was a lack of
opportunity.

Regards

Miroslav Pokorni

Hi All,

If the 2716 is a problem, you might want to go for the CAT28C16
EEPROM
This one is pin-compatble and still avalable from Catalyst (or any
other 28C16 which you can get)

Fred de Vries


--- In TekScopes@..., "Bruce Lane" <kyrrin@b...> wrote:

Hi, Miroslav,

* REPLY SEPARATOR *

On 07-Mar-04 at 23:08 Miroslav Pokorni wrote:

Oh, 2732 will work, just make sure that un-used address bit (A11,

pin 21)

is
nailed down, so that it is lower half of PROM that is read. As

for 2764,

that is a different proposition because it is 28 pin DIP (four

pins more

than 2716 or 2732), but doing a jerry rig to translate pins would

make it

usable.

You have also to watch programing voltage. Some of early PROMs

used 21V,

then came 15 V, then 12 V. You can program 12V device on 15V

programmer

setting, but there is no promise that device will not be damaged.

<g> Programming is the least of my worries. When Data I/O

designed the Unisite, they designed it to be 'pin driven.' This
means that each pin is, according to whatever algorithm you're
using, automatically and accurately programmed for Vpp, Vcc, and a
bunch of other alphabet soup as needed.

Thanks for the heads-up.


-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technologies --
kyrrin (at) bluefeathertech do/t c=o=m
"If Salvador Dali had owned a computer, would it have been

equipped with surreal ports?"

Hi, Miroslav,

* REPLY SEPARATOR *

On 07-Mar-04 at 23:08 Miroslav Pokorni wrote:

Oh, 2732 will work, just make sure that un-used address bit (A11, pin 21)
is
nailed down, so that it is lower half of PROM that is read. As for 2764,
that is a different proposition because it is 28 pin DIP (four pins more
than 2716 or 2732), but doing a jerry rig to translate pins would make it
usable.

You have also to watch programing voltage. Some of early PROMs used 21V,
then came 15 V, then 12 V. You can program 12V device on 15V programmer
setting, but there is no promise that device will not be damaged.

<g> Programming is the least of my worries. When Data I/O designed the Unisite, they designed it to be 'pin driven.' This means that each pin is, according to whatever algorithm you're using, automatically and accurately programmed for Vpp, Vcc, and a bunch of other alphabet soup as needed.

Thanks for the heads-up.


-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technologies --
kyrrin (at) bluefeathertech do/t c=o=m
"If Salvador Dali had owned a computer, would it have been equipped with surreal ports?"