Date   

453

Samuel
 

I got a tektronix 453 scope and wonder about the metalnet infront of
the screen. Is it ok to remove that or is it there for any good purpose?


Re: 453 CRT vs 336 CRT

Stan & Patricia Griffiths <w7ni@...>
 

Hello Alberto,

First, the 336 is 14.6 inches long and the 453 is considerably longer: 20.5
inches. This is not including the handle that can stick out the front.

Size is more important here than you may think. The major thing determining
the length of a scope cabinet is the length of the CRT. So, without really
looking, I would say the 453 CRT is a lot longer than the 336 CRT. Even if
they WERE the same length, the chance that a 336 CRT would work in a 453 is
very slight. There are just too many major differences between those
models.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "adibene" <i2phd@weaksignals.com>
To: <TekScopes@yahoogroups.com>
Sent: Monday, September 15, 2003 5:00 AM
Subject: [TekScopes] 453 CRT vs 336 CRT


I know that 99% the answer will be NO, but asking costs nothing...

<<Can the CRT of the 453 be used in the 336 scope ?>>

Judging from the exterior they are the same size, but size is
hardly the fundamental parameter (albeit an important one...)

Thanks
Alberto







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453 CRT vs 336 CRT

Alberto I2PHD
 

I know that 99% the answer will be NO, but asking costs nothing...

<<Can the CRT of the 453 be used in the 336 scope ?>>

Judging from the exterior they are the same size, but size is
hardly the fundamental parameter (albeit an important one...)

Thanks
Alberto


Re: link to some information about the 570 curve tracer

eboytoronto
 

The irony of this thread is that eventually it leads to the original Tek 'scopes being built in China !!!

John Barnes

---------- Original Message ----------------------------------
From: Fred Olsen <fwolsen@execpc.com>
Date: Sun, 14 Sep 2003 17:15:48 -0500

coresta wrote:
"copy" originals ... Cadillac / Zil
The ZIL was actually a knockoff of a mid-'50s Packard.
And there were the notorious TU-4 copies of the B-29.

but never "they" walked on the moon ...
There are those who think they crashed there though.

Fred
--
<><
--
Outgoing checked by Norton AV






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Re: 310 Scope Progress

Craig Sawyers <c.sawyers@...>
 

The guys at Tek made
sure I had none of this to deal with, though. The wires just made a
simple poke through the selenium stack eyelets prior to soldering,
and that was that.
That is a technique not without its problems - Nice to disassemble without
overheating the wire insulation - but I've fought with a number of obscure
faults in Tek gear resulting from a dry joint, or just flaky joint as a
result of years of thermal contraction and vibration. The irritating twist
it around method overcomes most of that.

My first scope in 1972 was an ex-military Harley 13A. With that, the
multi-strand wire was stripped long, pushed through and looped back. the
overlapping sections were then lashed together with about 8 turns of single
strand wire. It was then soldered. There was no way on God's green earth
that these could be undone.

Craig


RM503 Problems

doug_jackson@...
 

Hi,

I have a frustrating fault with a RM503 CRO.

The CRO is in *really nice* condition, so I would like to restore it to a
working state.

My problem is that the Power supply levels are all extremely low. From
memory, the +12V rail is at about 2V, the 250V rail is at about 30V, the
+/- 150V rails are also low at +/- 15V. So, proportionally, they are
correct in relation to each other.

The 500V input to the PSU is spot on.

I have obtained a copy of the service manual, which has helped
considerably. I have tried replacing all of the PSU valves (6DQ6A, 6BL8,
5642, 5651A), as they all looked quite sad, and I had an easily available
tube source. This has not proven to be effective. I have also verified
that all of the resistors are well within tolerance. I have verified that
none of the rectifiers are S/C, and they all drop 0.7V when in operation.

Unfortunately, I am running out of ideas, and am concerned that the
transformer may be at fault.

My questions to the group are;

1) Has anybody dealt with similar faults?
2) How likely is it that the transformer has developed a fault. Where
could I obtain a replacement?
3) Can somebody shed some light on what the normal operating frequency of
the Oscillator would be?
3) Have I missed anything?

I will openly admit that I am of the age where my world is largely
silicon, and that the only valves I have played with before were
transmitting valves.

regards

Doug Jackson
National Manager - Managed Services (ACT)
Citadel Securix Pty Ltd

Level 1, 10 Moore St
Canberra ACT 2601
Ph: (612) 6290 9011
Fx: (612) 6262 6152
Mob: 0414 986 878

Web: www.citadel.com.au
Melbourne - Sydney - Canberra - Brisbane - Hong Kong - Atlanta

Any pricing or time figures contained within this email are indicative
only, and have been provided for planning purposes only. Please request a
quotation from your sales representative prior to undertaking any work.



CAUTION - The information in this message may be of a privileged or confidential nature intended only for the use of the addressee or someone authorised to receive the addressee's e-mail. If you are not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this e-mail is strictly prohibited. If you have received this email in error please notify postmaster@citadel.com.au. Any views expressed in this message are those of the individual
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Feel free to visit the Citadel Securix website! Click below.
http://www.citadel.com.au


hey stef, have you ever filmed yourself doing it?

mythonginyourteeth11 <mythonginyourteeth11@...>
 

well i just got this digi cam from Steve the other day and I was home alone and started to feel a little horny when all of a sudden the parcel guy came to the door. i was in the middle of pleasuring myself in the living when i heard him. he must have heard me moaning cuz he had a huge grin on his face. check out what I did to him, youll be ashamed of me ;o(
http://www.touchdating.com/landing.asp?afl=MYHO


310 Scope Progress

mcinsand <mcintosh@...>
 

I do have *some* excuse for not getting more done in the past couple
of weeks, starting with four kids and a fairly challenging job. But,
anyway...

I removed the 5 selenium rectifier stacks tonight and further refined
my awe of the Tek engineers. Over the years, I have removed several
components where the assemblers apparently felt a need to tie off the
wire lead in a square-½hitch-doubleback-hangman's knot prior to
soldering. I hate wrestling with the juggling act of soldering
braid, wire tugging, and link-by-link snipping. The guys at Tek made
sure I had none of this to deal with, though. The wires just made a
simple poke through the selenium stack eyelets prior to soldering,
and that was that.

I did manage to think before removing components, though, and I
snapped a picture of the unmodified power supply section. This one
certainly looks original. With 1N4007's and newer electrolytics, the
empty volume should help with air circulation, huh?

I hope you guys are having a great weekend.

stan


[Fwd: TEK 7L12 Setup]

Arthur Shulman <dentist@...>
 

-------- Original Message --------
From: Arthur Shulman <dentist@nornet.on.ca>
Subject: TEK 7L12 Setup
To: "TekScopes@yahoogroups.com" <TekScopes@yahoogroups.com>

Could someone familiar with the 7L12 assist me with pre-use settings for
the screwdriver-adjust LIN & AMPL adjustments. I am familiar with the
HP141 settings, but would like to follow the recommended TEK procedure
for this instrument.

Arthur Shulman


Re: Proud "New" 535a Owner Needs Some Help

Stan & Patricia Griffiths <w7ni@...>
 

HI Casey,

You really need a manual. The first place to check is the power supplies to
make sure they are working correctly. The manual will tell you the test
poinst, how to check them, and what to expect. Once you have verfied the
power supplies are working right, we can proceed from there.

Check the following web page for a list of manual suppliers:

Tek Manual Suppliers List
http://www.reprise.com/host/tektronix/resources/manual_sources.asp

Stan
w7ni@easystreet.com

----- Original Message -----
From: "scale_chipper" <scale_chipper@yahoo.com>
To: <TekScopes@yahoogroups.com>
Sent: Wednesday, August 27, 2003 2:08 AM
Subject: [TekScopes] Proud "New" 535a Owner Needs Some Help


Hello All,

I was recently given a 535a w/1A1 plug-in. After futzing with it a
while, I have been able to get it working with the "B" timebase, but
not the "A" timebase.
Thanx in advance,
Casey Brown


Re: 545A trace out of focus at left edge

Stan & Patricia Griffiths <w7ni@...>
 

First thing I would try is a new CRT . . .

Stan
w7ni@easystreet.com

----- Original Message -----
From: "geojunkie2" <geojunkie@aol.com>
To: <TekScopes@yahoogroups.com>
Sent: Sunday, September 14, 2003 5:02 AM
Subject: [TekScopes] 545A trace out of focus at left edge


I don't see anything in the manual about what might cause this or
how to correct it. It is not fatal, but distracts from an otherwise
perfect scope. Anyone have any ideas how I might proceed?


Re: link to some information about the 570 curve tracer

Chris Gill
 

I have to agree with the comments, looks like a nice copy, but nothing
compare's to the original. I can't speak for the later Tek gear ( my later
gear is confined to the 7000, 4xx and 2335) but I have used and collected
Tek for 40+ years and there is no substitute. Still I would make room for
this copy.
Regards,
Chris.

----- Original Message -----
From: "Greyhawk" <greyhawkeng@hotmail.com>
To: <TekScopes@yahoogroups.com>; "Holger Hensel" <valvemax@yahoo.de>
Sent: Monday, September 15, 2003 4:22 AM
Subject: Re: [TekScopes] link to some information about the 570 curve tracer


The Chineese Copy Is Fairly Well Made (from The Pictures), (Sort Of The
"EICO" Of China) But, I Wouldn't Go As Far To Say It Is Better Than Teks
570, As Up To A Few Years Ago, Tek Was The Finest Quality Instrument Money
Could Buy, And Always Was My Choice When I Purchased T&M Eguipment.

Greyhawk
----- Original Message -----
From: Holger Hensel
To: TekScopes@yahoogroups.com
Sent: Sunday, September 14, 2003 12:57 PM
Subject: [TekScopes] link to some information about the 570 curve tracer


here a link to some information about the 570 curve
tracer.


http://www.jogis-roehrenbude.de/Roehren-Geschichtliches/Roe-Pruefer/Curve-Tr
acer/Curve-Tracer.htm

The page contains also some pictures from a chinese
rebuild.
The author claims that he owns probably the only two
remaining
chinese rebuilds.
The page is written all in german. The german text
basicaly says that
the original is just dirt compared with the extreme
high quallity of
the Chinese rebuild.

__________________________________________________________________

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Re: link to some information about the 570 curve tracer

Greyhawk <greyhawkeng@...>
 

The Chineese Copy Is Fairly Well Made (from The Pictures), (Sort Of The "EICO" Of China) But, I Wouldn't Go As Far To Say It Is Better Than Teks 570, As Up To A Few Years Ago, Tek Was The Finest Quality Instrument Money Could Buy, And Always Was My Choice When I Purchased T&M Eguipment.

Greyhawk

----- Original Message -----
From: Holger Hensel
To: TekScopes@yahoogroups.com
Sent: Sunday, September 14, 2003 12:57 PM
Subject: [TekScopes] link to some information about the 570 curve tracer


here a link to some information about the 570 curve
tracer.

http://www.jogis-roehrenbude.de/Roehren-Geschichtliches/Roe-Pruefer/Curve-Tracer/Curve-Tracer.htm

The page contains also some pictures from a chinese
rebuild.
The author claims that he owns probably the only two
remaining
chinese rebuilds.
The page is written all in german. The german text
basicaly says that
the original is just dirt compared with the extreme
high quallity of
the Chinese rebuild.

__________________________________________________________________

Gesendet von Yahoo! Mail - http://mail.yahoo.de
Logos und Klingeltöne fürs Handy bei http://sms.yahoo.de

Yahoo! Groups Sponsor
ADVERTISEMENT




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[Non-text portions of this message have been removed]


Re: link to some information about the 570 curve tracer

coresta <coresta@...>
 

Hello Teklovers!
Incredible ... Craig is right , Soviet and Chinese were only able to "copy" originals ! Concorde / Tupolev, Discovery / Bourhane , Cadillac / Zil and others 570 / GT2 (...) are "military" made but never "they" walked on the moon ...

best regards

Pierre


Re: link to some information about the 570 curve tracer

Miroslav Pokorni
 

Those Chinese have added few controls, probably to suit testing of tubes and
parameters that they most frequently do.

But Chinese copy is nothing comparing to what Russians did. Ruskies copied
down to color of knobs and cabinet. I think it was 545 that I have seen, the
only giveaway were crudeness of knob finish and Russian text on the front
panel; I do not think they paid royalty to Tektronix.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Holger Hensel" <valvemax@yahoo.de>
To: <TekScopes@yahoogroups.com>
Sent: Sunday, September 14, 2003 9:57 AM
Subject: [TekScopes] link to some information about the 570 curve tracer


here a link to some information about the 570 curve
tracer.

http://www.jogis-roehrenbude.de/Roehren-Geschichtliches/Roe-Pruefer/Curve-Tr
acer/Curve-Tracer.htm

The page contains also some pictures from a chinese
rebuild.
The author claims that he owns probably the only two
remaining
chinese rebuilds.
The page is written all in german. The german text
basicaly says that
the original is just dirt compared with the extreme
high quallity of
the Chinese rebuild.

__________________________________________________________________

Gesendet von Yahoo! Mail - http://mail.yahoo.de
Logos und Klingelt�ne f�rs Handy bei http://sms.yahoo.de


Freshly dead 7903?

Joe Sleator <joe@...>
 

Hi,

Any advice or experience would be greatly appreciated!

The story:
I've been using my rackmount 7903 on and off for a year or so, and loving
it, up until last week when it failed.

I think it's a fairly common version with 2x7a26 and a 7B92 timebase.
I believe the modules are ok, and that the problem is in the mainframe, but
I'm not sure.

The Symptom:
Worked fine, then next powerup, the screen was a blurry dot, which then
after some seconds, got very much brighter. None of the front panel controls
have any effect anymore except the focus which 'focuses' the bright blurry
dot, and the beam finder, which moves the bright blurry dot sideways. I do
not leave it turned on like this for any time for fear of buring the
phosphor.

The switchmode PSU seems to be fully coming up which leads me to believe
whatever it is is not being detected by the fault detection system. The
device probably does not know it is not sweeping at all. I have access to
healthy 7903s to module swap and make sure that they themselves are not the
problem. Other than that I'm rather unequipped to deal with repairing this
scope, but willing to have a go with some advice, and perhaps a source of
spares.

Suspected:
Sweep generation circuits, and/or PSU. Having a quick look at the rear board
on top of the tube, the voltages listed on the PCB are not being seen; way
off. I'm a bit skittish to go any further without some hints or service
doco, so I'm sort of stuck...

Looking at another empty frame on ebay for spares to try to resurrect this
one. Those Tek custom IC's are fairly hard to source...

Thanks,

Joe Sleator


Re: link to some information about the 570 curve tracer

Craig Sawyers <c.sawyers@...>
 

Well, that is amazing - I had no idea anyone had done a clone of the 570.
But then again, one of the main sources of supply for tubes now is China -
so it figures that the industry would need a curve tracer of some
description.

? The german text
basicaly says that
the original is just dirt compared with the extreme
high quallity of
the Chinese rebuild.
Oh dear. Nothing I could say that would be polite I'm afraid - the pictures
say it all, whatever the page author may think.

Craig


link to some information about the 570 curve tracer

Holger Hensel
 

here a link to some information about the 570 curve
tracer.

http://www.jogis-roehrenbude.de/Roehren-Geschichtliches/Roe-Pruefer/Curve-Tracer/Curve-Tracer.htm

The page contains also some pictures from a chinese
rebuild.
The author claims that he owns probably the only two
remaining
chinese rebuilds.
The page is written all in german. The german text
basicaly says that
the original is just dirt compared with the extreme
high quallity of
the Chinese rebuild.

__________________________________________________________________

Gesendet von Yahoo! Mail - http://mail.yahoo.de
Logos und Klingelt�ne f�rs Handy bei http://sms.yahoo.de


Flaky 475 Vertical Attenuator

tss_steve_990
 

Channel 2 Input on my 475 is flaky. Instead of the attenuator
setting being steady in the detent you can wiggle the knob and get
different levels. One attenuator position of my channel 1 (I think
it is .1 volts with X10) has a really bad rolled off square wave, but
all other positions are ok. It seems that a contact cleaning and/or
adjustment session is needed. I have a good pdf manual but I found no
reference to how to properly clean the contacts on this thing. I
want to be very careful not to screw them up.
It seems that on the channel 2 the cams that operate the switches
might not be properly aligned with the detent mechanism. Is that
possible? Or is it more likely that dirty contacts are the source of
my problem. By the way, it seems that channel 2 is a bit noisier
than channel 1 even with the BW limit switch pulled out. Are there
lower noise amps nowadays that can be substituted? (All case
grounding fingers are in place, by the way)


Thanks,
Steve Hogan


545A trace out of focus at left edge

geojunkie2 <geojunkie@...>
 

I don't see anything in the manual about what might cause this or
how to correct it. It is not fatal, but distracts from an otherwise
perfect scope. Anyone have any ideas how I might proceed?

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