Date   

545b/l20

kathnrich <kathnrich@...>
 

Hi all;
Will a Tek 545b work with a 1L5, or a L20 spectrum analysers?
Thanks,,,Rich


Re: 545b/l20

Craig Sawyers <c.sawyers@...>
 

According to the 1L5 manual it says that a modification is
required for the
1L5 to be used with the 545 scopes.
Absolutely true. And although there is no mention of this in the 1L20
manual *exactly* the same problem occurs, with the same cure.

Craig


Re: "Forming capacitors" - means what?

Miroslav Pokorni
 

The gradual voltage increase seems just to extend time of the process and
does not seem to buy anything effective. Checking temperature is probably
good thing, but you have to be checking very often and be a damn fast gun to
react to any increase.

It seems to me to be much more effective to have a current source that would
limit current to, say 10 mA, and ram full rated voltage to the cap. If cap
shorts, 10 mA at 450V is below 5W, not enough to destroy anything, and if
cap reforms current will drop. That is how caps are made, in first place,
then reforming can be done in same way.

Current source is quite a simple thing, a power FET on a moderate heat sink,
an opamp and a voltage reference of any kind would do the job.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Mark Gulbrandsen" <cinerama84106@yahoo.com>
To: <TekScopes@yahoogroups.com>
Sent: Sunday, June 22, 2003 8:30 AM
Subject: [TekScopes] Re: "Forming capacitors" - means what?


I use an EICO 1030 variable high voltage bench supply to re-form
caps. This not only has adjustable DC voltage output of up to 400
volts but it also has a ma meter on the front panel as well for
monitoring leakage. This unit has been valualable to reform
capacitors,and I agree on the temperature idea..... A warm capacitor
is definately a leaking capacitor. It does take about 48 hours to
properly reform a cap!! I start out at 100 volts(for a 450 volt cap),
50 volts(for a 350 volt cap) then dial it up by about 50 volts every
4 hours or so. When its at the max cap voltage I let it run another
24 hours checking the caps temperature frequently t be sure its not
too hot. Sometimes they will get a tad bit warm, but eventually the
caps temp goes back down to room temperature. Never had one leak or
explode on me this way.
Mark


Re: Replacement probes

Miroslav Pokorni
 

Hello Stan,

Those that you say were crimped are probably for P610X probes. I never tried
to repair those cables, I only replaced them. The P610X were modular and you
could buy box, cable and tip. I do not think those probes were pinnacle of
Tektronix' quality, connectors that mated to cable were pretty poor. It
happened more then few times that probe would quit working again shortly
after cable replacement 'repair'. Mating and unmating cable and end piece of
probe would fix the problem but that was a short term solution, the end
piece needed to be replaced. I found it overly expensive to repair those
probes and at one point I started to buy new probes when an old developed
trouble and just saved old ones to use as spare parts.

The cables that I tried to repair were for P600X. Cable ends were spot
welded and soldering worked with lot of scraping and use of Aspirin as flux.
That soldering taught me to treat probes with respect.

I am not really surprised that Tektronix did their own cable, a probe cable
does not have other applications. The Beldens of this world would not design
and make 10000 yards of probe cable just for Tektronix and hp. Maybe now a
common cable manufacturer might use one of their machines to make one run of
customer designed cable and price it accordingly, there seems to be more
custom runs now than there was in 60s.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Stan & Patricia Griffiths" <w7ni@easystreet.com>
To: "Miroslav Pokorni" <mpokorni2000@yahoo.com>
Cc: "TekScopes" <TekScopes@yahoogroups.com>
Sent: Saturday, June 21, 2003 6:26 PM
Subject: Re: [TekScopes] Replacement probes


Back in the "old days" (before about 1980, or so), Tek used to manufacture
their own probe cables. They did this because, like all components that
Tek
manufactured, they could not find suitable cable on the market from other
manufacturers. If you have ever had occasion to try to repair a Tek
probe,
you probably have noticed that the coax used for the probe cable has a
VERY
fine center conductor and you can't really solder to it either. It is
wire
with distributed resistance and the connections at both ends are crimped.
Repairing a damaged probe cable generally means replacing the probe cable
with a new one. I have no idea what Tek does these days for good probe
cable. My guess is that, by now, other suppliers of cable have figured
out
how to make quality cable.

Tek even made the machines that made the cable. Watching a machine weave
a
braided shield over an insulated center conductor is a process that defies
description . . . so I won't even try it . . . I probably have some
pictures of these huge machines somewhere in my 10,000+ pictures that I
salvaged when Tek threw out their photography archives. In all fairness
to
Tek, they saved a thousand or so pictures and I got the left-overs.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "Miroslav Pokorni" <mpokorni2000@yahoo.com>
To: "Stan & Patricia Griffiths" <w7ni@easystreet.com>
Cc: <TekScopes@yahoogroups.com>
Sent: Tuesday, June 17, 2003 5:59 PM
Subject: Re: [TekScopes] Replacement probes


Hello Stan,

I think in your career you saw more then few probes that were dirty and
customer was asking you how comes that the other guy could make them for
less.

What I noticed about 'third party probes' is that the only specification
given is the bandwidth. I have never seen that any of them go into rise
time, let alone signal aberrations. The rise time spec for this 'Texas
probe
' is just an extension of declared bandwidth, a calculated value. That
seller got quite a bit money for something that is quite questionable.

As for switch, I also wonder about its effects on performance, even at
100
MHz. Tektronix had one of those, too.

I understand that one of tuff things for probe is the cable. When you
deal
with high impedance at cable ends, the effects of dielectric absorption
(charge in dielectric remaining after bringing voltage to zero) become
noticeable and that leads to unwanted ringing.

Regards

Miroslav Pokorni


Re: 545b/l20

Dave Henderson <nr1dx@...>
 

According to the 1L5 manual it says that a modification is required for the 1L5 to be used with the 545 scopes. Sounds like you have to move a wire from the R1153 / R1152 junction to the other end of R1153 which changes the +225 volt supply to the "Vertical Signal Out CF" whatever that means 8^).Sounds like it will work without the mod but you get a lopsided (distorted) display on CW signals.

Dave
NR1DX

At 04:58 PM 6/22/2003 -0700, kathnrich wrote:
Hi all;
Will a Tek 545b work with a 1L5, or a L20 spectrum analysers?
Thanks,,,Rich








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Re: 2430 service manual

Chuanxiao Li \(Pholink\)
 

I think the military version (TM 09045B-40/2) is different from Tek service manual 070-6330-00. Attached is "table of contents" of military version. One can not download from www.logsa.army.mil/etms/show_etm.cfm if you is not contractor of DOD.
j5w23 sold 3 military version service manuals on eBay. The price are:
eBay item number 2533784289 for $51.00 + S/H
eBay item number 2535456274 for $33.56 + S/H
eBay item number 2537390086 for $9.99 + S/H

I think the military version is only maintenance manual???

----- Original Message -----
From: <TekScopes@yahoogroups.com>
To: <TekScopes@yahoogroups.com>
Sent: Sunday, June 22, 2003 9:30 AM
Subject: [TekScopes] Digest Number 773



You might ask the eBay guy selling this military version of the
2430A about his 'Operators and Maintenance Manual', with an opening
bid of $10. The Tek 212 military version of a similar manual, down-
loadable from www.logsa.army.mil, has block diagrams, component
layouts, exploded views and schematics. About the same coverage as
a Tek Service Manual.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2539646473&category=25409

Jimmy Joe


634 video monitor

Craig Sawyers <c.sawyers@...>
 

Hi folks

I've ransacked every source that I know of to get a manual for the 634 video
monitor; even Deane Kidd doesn't have one! Anyone on the list got one that
they would either part with (for cash of course!) or would lend me so that I
can take a copy?

Thanks and regards

Craig


Re: I need a manual for a 545B...

KB6NAX
 

I've had a 545B as one of my favorite bench scopes going on 15 years. For
the size of the manual and how much you saved on your purchase I would
recommend buying an original manual from one of the test equipment manual
vendors. Probably $50-$75 you are looking at. No sweep? Or no beam (no
HV)? Good luck.

Arden

----- Original Message -----
From: "nywfre" <pat@mrblooze.com>
To: <TekScopes@yahoogroups.com>
Sent: Sunday, June 22, 2003 2:45 AM
Subject: [TekScopes] I need a manual for a 545B...


Hello out there--

I just acquired a beautiful 545B with a bunch of plugins, including,
happily, the calibrator, and a passle of tubes. It was 'working'
when I acquired it through a third party (for the princely sum of
$10, so I'm hardly complaining..), but when I fired it up found no
sweep.

Does anyone have a manual that they can tell me how big a tome I'm
looking at copying? Cost permitting, I'll pay the possessor of said
manual to reproduce it at some print shop and post it to me. At the
moment, even a scan off the appropriate section of the scats would be
wonderful, as something to start from.

Any help is appreciated...

Oh, and does anyone out there have a spare power supply for a 2246
that they're willing to part with, or know where I might find one?

Tks...

Pat





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Re: 2430 service manual

Don Black <jeans@...>
 

If you mean the LOGSA site, there's a variety of information, some classified,
some not. You need a password to download the operating manual for a Patriot
Missile for instance but much of it if free to download.
I guess the Tektronix 2430A and 2465B hasn't been released yet, perhaps they're
concerned about copyright or something. They seem to be the only two Tektronix
that's barred at LOGSA.
The 2665B service manual and 3430 user manuals are available from
<http://www.teknetelectronics.com/> to download.
Don Black.

JJ wrote:

Ed Fallon writes:

-----Original Message-----
From: ed_fallon [mailto:edfallon@cablespeed.com]
That military site looks interesting for downloading manuals but
whats up with the "authorized access only" warning screen? I didn't
go any further once I saw that.

-Ed
It's beyond my ken why a anyone would place such an ominous warning
about 'Authorized Access Only' and then put downloadable information
on a server that is accessible to all the world with a 'net connection.

Jimmy Joe




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Re: 7B85

Stan & Patricia Griffiths <w7ni@...>
 

I'll take a guess . . .

This is probably for rear panel external triggering and to be effective, the
mainframe has to have a mating connector installed with a cable routed to
the rear panel. There is probably an internal switch installed somewhere
inside the 7B85 that allows you to switch from the front panel external
trigger to the rear panel external trigger. This is just a guess.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "Morris Odell" <morriso@vifp.monash.edu.au>
To: "Tekscopes (E-mail)" <TekScopes@yahoogroups.com>
Sent: Tuesday, June 17, 2003 6:47 PM
Subject: [TekScopes] 7B85


Hi all,

I have a 7B85 with option "JA". It seems to work as normal, but there is a
coax cable inside leading to a pin in one of those little plastic holes in
the block above the plug-in edge connector. Neither my 7603 nor my 7834
seems to have a mating connection for it.

Anyone know what this option is?

Thanks,

Morris




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Reforming Capacitors.....

cinerama84106
 

Here is an interesting link about the process and Proceedure of
reforming caps......
Mark

http://www.vcomp.co.uk/tech_tips/reform_caps/reform_caps.htm


Re: "Forming capacitors" - means what?

cinerama84106
 

I use an EICO 1030 variable high voltage bench supply to re-form
caps. This not only has adjustable DC voltage output of up to 400
volts but it also has a ma meter on the front panel as well for
monitoring leakage. This unit has been valualable to reform
capacitors,and I agree on the temperature idea..... A warm capacitor
is definately a leaking capacitor. It does take about 48 hours to
properly reform a cap!! I start out at 100 volts(for a 450 volt cap),
50 volts(for a 350 volt cap) then dial it up by about 50 volts every
4 hours or so. When its at the max cap voltage I let it run another
24 hours checking the caps temperature frequently t be sure its not
too hot. Sometimes they will get a tad bit warm, but eventually the
caps temp goes back down to room temperature. Never had one leak or
explode on me this way.
Mark


I need a manual for a 545B...

nywfre
 

Hello out there--

I just acquired a beautiful 545B with a bunch of plugins, including,
happily, the calibrator, and a passle of tubes. It was 'working'
when I acquired it through a third party (for the princely sum of
$10, so I'm hardly complaining..), but when I fired it up found no
sweep.

Does anyone have a manual that they can tell me how big a tome I'm
looking at copying? Cost permitting, I'll pay the possessor of said
manual to reproduce it at some print shop and post it to me. At the
moment, even a scan off the appropriate section of the scats would be
wonderful, as something to start from.

Any help is appreciated...

Oh, and does anyone out there have a spare power supply for a 2246
that they're willing to part with, or know where I might find one?

Tks...

Pat


Re: "Forming capacitors" - means what?

KB6NAX
 

I don't find anything to quibble with in this thread. I've
reformed 'lytics in numerous old radios and audio amplifiers and
monitoring capacitor temperature is the best indicator for
controlling the reforming process. I recently reformed the 'lytics
in a McIntosh MC75 amplifier. The power supply uses silicon diode
rectifiers in a voltage doubler arrangement which if full line
voltage is applied will blow leaky capacitors to kingdom come. I
controlled capacitor temperature by adjusting the variac to keep the
capacitors from becoming uncomfortably warm. A capacitor that
exhibits high leakage current will of course act like a resistor and
heat up. As the capacitor warms up the leakage current increases.
The increased current will increase the temperature and if reforming
does not act to limit the temperature rise the capacitor will go into
thermal runaway and blow its juices out (and in some cases the
capacitor may explode). The McIntosh caps ran warm for about 16
hours before they reformed sufficiently to cool down. To be sure, I
kept the process going for 48 hours going to full line voltage after
about 24 hours (don't be in a rush to increase voltage!). The friend
who I restored the amp for is happily listening to it daily. How do
I measure capacitor temperature? With my hand (only one hand though,
I follow the one hand rule when working on high voltage stuff and so
far it has saved me to write this - hi!). I remove the tubes in
vacuum tube gear to keep the capacitors from being heated by the
tubes. Use of a metered variac helps as you can see if power supply
current is increasing, a sure indicator that trouble is ahead. Not
all old capacitors will reform, they will continue to exhibit high
leakage current and as someone mentioned they will eventually short.


Another eBay goodie

Craig Sawyers <c.sawyers@...>
 

Hi folks

Just found a really sweet Tek power supply, eBay 2540558827. It has + 36V @
500 mA; +15V @ 500 mA; +5V @ 4A; -5.2V @ 4A; -15V @500 mA; -36V @500 mA.
Seller has it on for $29.99 buy it now!

Darned thing weighs 25lb, so it is not practical to get it across the pond
to the UK (where I am).

So over to y'all....

Craig


Re: 2430 service manual

JJ <jimmy.joe@...>
 

Ed Fallon writes:

-----Original Message-----
From: ed_fallon [mailto:edfallon@cablespeed.com]
That military site looks interesting for downloading manuals but
whats up with the "authorized access only" warning screen? I didn't
go any further once I saw that.

-Ed
It's beyond my ken why a anyone would place such an ominous warning
about 'Authorized Access Only' and then put downloadable information
on a server that is accessible to all the world with a 'net connection.

Jimmy Joe


Re: Replacement probes

Stan & Patricia Griffiths <w7ni@...>
 

Back in the "old days" (before about 1980, or so), Tek used to manufacture
their own probe cables. They did this because, like all components that Tek
manufactured, they could not find suitable cable on the market from other
manufacturers. If you have ever had occasion to try to repair a Tek probe,
you probably have noticed that the coax used for the probe cable has a VERY
fine center conductor and you can't really solder to it either. It is wire
with distributed resistance and the connections at both ends are crimped.
Repairing a damaged probe cable generally means replacing the probe cable
with a new one. I have no idea what Tek does these days for good probe
cable. My guess is that, by now, other suppliers of cable have figured out
how to make quality cable.

Tek even made the machines that made the cable. Watching a machine weave a
braided shield over an insulated center conductor is a process that defies
description . . . so I won't even try it . . . I probably have some
pictures of these huge machines somewhere in my 10,000+ pictures that I
salvaged when Tek threw out their photography archives. In all fairness to
Tek, they saved a thousand or so pictures and I got the left-overs.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "Miroslav Pokorni" <mpokorni2000@yahoo.com>
To: "Stan & Patricia Griffiths" <w7ni@easystreet.com>
Cc: <TekScopes@yahoogroups.com>
Sent: Tuesday, June 17, 2003 5:59 PM
Subject: Re: [TekScopes] Replacement probes


Hello Stan,

I think in your career you saw more then few probes that were dirty and
customer was asking you how comes that the other guy could make them for
less.

What I noticed about 'third party probes' is that the only specification
given is the bandwidth. I have never seen that any of them go into rise
time, let alone signal aberrations. The rise time spec for this 'Texas
probe
' is just an extension of declared bandwidth, a calculated value. That
seller got quite a bit money for something that is quite questionable.

As for switch, I also wonder about its effects on performance, even at 100
MHz. Tektronix had one of those, too.

I understand that one of tuff things for probe is the cable. When you deal
with high impedance at cable ends, the effects of dielectric absorption
(charge in dielectric remaining after bringing voltage to zero) become
noticeable and that leads to unwanted ringing.

Regards

Miroslav Pokorni


Re: 1L20 spectrum analyzer

Dave Brown <tractorb@...>
 

Are they rare in general or just on Ebay?
I have a 1L20 and a 1L30- Like most older harmonic mixer types they are not
any use for wide band scanning but fine when you know just where you want to
look in some detail. If there are any 'very cheap' 1L5 or 1L10 plugins out
there I may be interested.

Dave Brown
Christchurch, NZ

----- Original Message -----
From: "Craig Sawyers" <c.sawyers@tech-enterprise.com>
To: "TekScopes" <TekScopes@yahoogroups.com>
Sent: Saturday, June 21, 2003 6:04 PM
Subject: [TekScopes] 1L20 spectrum analyzer


Hi folks

Just spotted a rarity on eBay: 2540324297. This is a 1L20 rf spectrum
analyzer that fits the old tubed 5xx series scopes (like the 545). Goes
from 10MHz to 4.2GHz. It is basically most of the front end of a 491
(which
sell for around $600), so if you have a older scope (like I do) you get an
rf spectrum analyzer on the cheap. It has a basic sensitivity of -100dBm
or
so, with a maximum input of -30dBm giving a raw dynamic range of 70 - 80dB
with 1kHz bandwidth.

I already have one - and very fine and useful it is too - and the seller
has
this one on for $132 on buy-it-now.

I have no involvement in the sale, BTW...just thought y'all might be
interested.

Craig





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Re: 2430 service manual

JJ <jimmy.joe@...>
 

Chuanxiao Li writes:

There are lot of 2430 service manuals on eBay, price is $5.00.
2430A service manual is rare, start from $100, some one ask
$250. I have looked for long time.

Li
You might ask the eBay guy selling this military version of the
2430A about his 'Operators and Maintenance Manual', with an opening
bid of $10. The Tek 212 military version of a similar manual, down-
loadable from www.logsa.army.mil, has block diagrams, component
layouts, exploded views and schematics. About the same coverage as
a Tek Service Manual.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2539646473&category=25409

Jimmy Joe


Re: 2430 service manual

Chuanxiao Li \(Pholink\)
 

There are lot of 2430 service manuals on eBay, price is $5.00. 2430A service
manual is rare, start from $100, some one ask $250. I have looked for long
time.

Li

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