Date   

7912 fan direction

Craig Sawyers <c.sawyers@...>
 

Hi Folks

A question for those who have a 7912 transient digitizer (there are a couple
on the list). Could you check for me which direction the fan blows the air?
Mine blows air out of the case, and sucks it in through the holes in the
side panels.

Reason is, I was adjusting the links on mine to get it working with UK video
standard, and nearly dropped the board I'd just pulled because it was so
hot. Bristling with ECL, so very power hungry. I've now got a sensor
looking at the air temperature between that board and the next, and it is
reading 44C in an ambient of 19C - IOW a 25C increase. Since the
environmental spec on the instrument is up to 40C ambient, that implies an
air temperature at that point of 65C, and a chip temperature maybe 10C
hotter still. I notice that three or four chips have been replaced on that
board, so maybe that is why!

Now the arrow on the fan casing indicates that air is to be expelled - it
points *out* of the case. There are also no witness marks on the other four
holes to indicate that it was ever in there the other way round. However,
the *is* evidence that it has been replaced - the wires are cut, and spliced
(nicely - not a bodge job).

So the question is - what direction is the fan supposed to be? Blowing air
into the case, or sucking air out of it?

Thanks!

Craig


Re: Grain of wheat bulbs for scale illuminator in 2465 scope

Miroslav Pokorni
 

The bulb technology did not advance over last thirty years, it is still good
old tungsten filament in vacuum, not even filled with noble gases. However,
resolve of manufacturers to produce quality product seem to have retrograded
and I guess that is why Tektronix went to a small Japanese firm for light
bulbs.

Those bulbs are not aged to screen them for long life, it is light output
that screening was going after. As for life, there is no secret there, just
reduce voltage on the bulb to 80% of filament design voltage and life goes
from usual 5000 to 50000 hours; light output is halved, but that is usually
of not much concern for an instrument indicator.

The life data re-rating is based on historical data, if that is any
consolation to Craig.

Going to primary source of data usually produces better result, rather then
checking a cataloger's data, which is copied from an unknown source, most
likely without proofing and that source might no longer supply the product;
but, data sheet is there, why change.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Craig Sawyers" <c.sawyers@tech-enterprise.com>
To: "TekScopes" <TekScopes@yahoogroups.com>
Sent: Tuesday, June 24, 2003 11:24 PM
Subject: RE: [TekScopes] Grain of wheat bulbs for scale illuminator in 2465
scope


No but it's an alternative source, you just might have to replace
them a bit
more often, then again - perhaps not.
Don Black.
Does anyone seriously think that Farnells of this world sell
anything 'like
these lamps at the fraction of the cost'?
Miroslav Pokorni
Thanks Don - as you imply I was simply trying to help in giving a source
for
the darned things. And of course, if anyone looks at the Farnell
catalogue,
they will see that not only are they the same size, voltage and current
(5V,
0.115A), they have the same lifetime (50,000 hours). Maybe bulb
technology
has moved on in the last thirty years, but I note that 50k hours
corresponds
to 25 years if the scope is used 40 hours a week (or 6 years if left
switched on 24/7) - which is frankly good enough to see most of us nailed
in
the box with the typical useage our scopes see.

Or maybe Miroslav is offering to age, and then screen these bulbs for
light
output for us?

Craig


Re: Forming Capacitors... How about a dimmer??

Miroslav Pokorni
 

No light dimmers in circuit with transformer. There is no promise that triac
in those things would conduct symmetrically, hence you wind up with a DC
component and that can kill transformer. Most likely, the fuse would go
before transformer gives way, but there is no guarantee there, either.

Regards

Miroslav Pokorni

----- Original Message -----
From: "aabasiry" <aabasiry@yahoo.com>
To: <TekScopes@yahoogroups.com>
Sent: Tuesday, June 24, 2003 10:58 PM
Subject: [TekScopes] Forming Capacitors... How about a dimmer??


Re the last thread on forming electrolytic capacitors, instead of
using a variac (which may not be availble somtimes), how about
inserting a light dimmer (keeping an eye on the wattage)in series to
power up the piece of equipment that needs cap reforming and cracking
the voltage slowly? I understand that the voltage waveform out of
these dimmers are not sinusoidal wave ( due to the clipping action of
the Thyristor inside them), but does it really matter in this case?

Also, due to the output not being sinusidal, a fair amount of
harmonics is present in the output voltage.. Can this affect the
operation in a bad way??

Please advise if you agree/disagree..
Thanks and regards


Re: Grain of wheat bulbs for scale illuminator in 2465 scope

Pauli Jokimies <jokimies@...>
 

Hello

I have those bulbs in my stock ( only about 10 of them )
I can sell those $5 per unit.

Those who are interested please contact
directly to my E-mail address;
jokimies@surfeu.fi

Best regards
Pauli


Re: Grain of wheat bulbs for scale illuminator in 2465 scope

Craig Sawyers <c.sawyers@...>
 

No but it's an alternative source, you just might have to replace
them a bit
more often, then again - perhaps not.
Don Black.
Does anyone seriously think that Farnells of this world sell
anything 'like
these lamps at the fraction of the cost'?
Miroslav Pokorni
Thanks Don - as you imply I was simply trying to help in giving a source for
the darned things. And of course, if anyone looks at the Farnell catalogue,
they will see that not only are they the same size, voltage and current (5V,
0.115A), they have the same lifetime (50,000 hours). Maybe bulb technology
has moved on in the last thirty years, but I note that 50k hours corresponds
to 25 years if the scope is used 40 hours a week (or 6 years if left
switched on 24/7) - which is frankly good enough to see most of us nailed in
the box with the typical useage our scopes see.

Or maybe Miroslav is offering to age, and then screen these bulbs for light
output for us?

Craig


Forming Capacitors... How about a dimmer??

aabasiry
 

Re the last thread on forming electrolytic capacitors, instead of
using a variac (which may not be availble somtimes), how about
inserting a light dimmer (keeping an eye on the wattage)in series to
power up the piece of equipment that needs cap reforming and cracking
the voltage slowly? I understand that the voltage waveform out of
these dimmers are not sinusoidal wave ( due to the clipping action of
the Thyristor inside them), but does it really matter in this case?

Also, due to the output not being sinusidal, a fair amount of
harmonics is present in the output voltage.. Can this affect the
operation in a bad way??

Please advise if you agree/disagree..
Thanks and regards


Re: Grain of wheat bulbs for scale illuminator in 2465 scope

Don Black <jeans@...>
 

No but it's an alternative source, you just might have to replace them a bit
more often, then again - perhaps not.
What you're saying is why we're all here. Tektronix is a cut above the rest
because they took such trouble i.e. Rolls Royce of Scopes.
Don Black.

Miroslav Pokorni wrote:

I saw description of those lamps used by Tektronix, which said how they
migrated from generic to Tektronix part number. They were first aged for an
ungodly number of hours, I think it was in hundreds, and then selected for
uniform light output. There was no mention whether aging was accelerated,
i.e. whether those hundreds of hours were equivalent hours, but can you
imagine cost of fixturing and even real estate for aging set up, then test
and fall out; I would bet that at that time each lamp was manually handled.

Does anyone seriously think that Farnells of this world sell anything 'like
these lamps at the fraction of the cost'?

Regards

Miroslav Pokorni

----- Original Message -----
From: "Don Black" <jeans@nex.net.au>
To: "Stan & Patricia Griffiths" <w7ni@easystreet.com>
Cc: "tbfowler100" <tfowler@mitretek.org>; "TekScopes"
<TekScopes@yahoogroups.com>
Sent: Tuesday, June 24, 2003 7:07 AM
Subject: Re: [TekScopes] Grain of wheat bulbs for scale illuminator in 2465
scope

Those lamps sound very similar to the early sharp VCR cassette lamps.
Generic
versions should be available for a fraction of Tektronix price. I'll have
to find
a catalogue to find the Sharp part number but perhaps someone else knows
where to
get them in the US. I'll also have to check their diameter in case they're
slightly fatter. Do they have flying leads or pigtails to solder into a PC
board?

Don Black.

Stan & Patricia Griffiths wrote:

Hi,

I'm behind a hundred or so emails so I don't know if you ever received
an
answer to this inquiry or not. Anyway, here is some info for you.

Tek's 1994 price for these incandescent bulbs (150-0057-01) was $5.95
each.
If you find some, at least you will have some idea of what they should
cost.
Tek procured their from the following company:

Oshino Electric Lamp Works Ltd.
52 Minami Shinagawa 2 Chome
Shinagawa Ku
Tokyo, Japan

Manufacturer's Part Number: OL715AS15TPL

The is part was used in many 2400 series and early 7K mainframes and
plugins.

It is rated at 5 volts at 115mA.

Estimated life is 50,000 hours.

I don't have any nor do I know where you can get them but the above info
may
help you locate some.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "tbfowler100" <tfowler@mitretek.org>
To: <TekScopes@yahoogroups.com>
Sent: Friday, June 13, 2003 4:50 PM
Subject: [TekScopes] Grain of wheat bulbs for scale illuminator in 2465
scope

Does anyone know where to get replacement bulbs for the scale
illuminator in a 2465 series scope? The bulbs are 2.5 mm, 115 ma,
5v, TEK part number 150-0057-01. Radio Shack doesn't seem to have
anything close, and I can't find anything in the model railroading
web sites either.





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http://docs.yahoo.com/info/terms/





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http://docs.yahoo.com/info/terms/


1L20 and spectrum analyzers

Craig Sawyers <c.sawyers@...>
 

We were just discussing 1L20's - and there happens to be one on eBay at the
moment: 2541216052, with an opening price of $9.99. Also spotted a 1L5:
2539420945.

Already got both of these, so it's over to y'all.

Craig


Re: Grain of wheat bulbs for scale illuminator in 2465 scope

Miroslav Pokorni
 

Lamps that appear like ones in Tektronix scopes can be found occasionally at
Radio Shack, too. I did not quite figure out Radio Shack, but I think it is
after their supply cycle (two year period?) number of parts are available,
then they run out and just when I think parts are off the list, they show up
again.

Then there are catalogers, Digikey and Mouser.

The Allied is an industrial supplier, last time I used them they required
customers to carry an account with them, but I do not see any indication of
that now.

Do not kid yourself, stuff sold by any of those places is not a shadow of
what went into Tektronix instrument. Can you imagine changing one of those
lamps after disassembling the whole scope to access it and then lamp goes
blink on you or lamp is so bright that washes out everything else on the
front panel?

I used Radio Shack lamps as indicators in a test and one of them died. It
was not a big deal for me, access was easy and reliability was not an issue,
but I would not feel same way about scope lamp.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Craig Sawyers" <c.sawyers@tech-enterprise.com>
To: "TekScopes" <TekScopes@yahoogroups.com>
Sent: Tuesday, June 24, 2003 10:36 AM
Subject: RE: [TekScopes] Grain of wheat bulbs for scale illuminator in 2465
scope


Those lamps sound very similar to the early sharp VCR cassette
lamps. Generic
versions should be available for a fraction of Tektronix price.
I'll have to find
a catalogue to find the Sharp part number but perhaps someone
else knows where to
get them in the US. I'll also have to check their diameter in case
they're
slightly fatter. Do they have flying leads or pigtails to solder
into a PC board?
Both types, with the same spec that Stan quoted, are available from
regular
electronics suppliers for small amounts of money. In the UK Farnell sell
them. There was some posts on this not so long ago, so check the
archives.
Could be Allied that sell them in the US, maybe other places too.

Craig


Re: Grain of wheat bulbs for scale illuminator in 2465 scope

Miroslav Pokorni
 

I saw description of those lamps used by Tektronix, which said how they
migrated from generic to Tektronix part number. They were first aged for an
ungodly number of hours, I think it was in hundreds, and then selected for
uniform light output. There was no mention whether aging was accelerated,
i.e. whether those hundreds of hours were equivalent hours, but can you
imagine cost of fixturing and even real estate for aging set up, then test
and fall out; I would bet that at that time each lamp was manually handled.

Does anyone seriously think that Farnells of this world sell anything 'like
these lamps at the fraction of the cost'?

Regards

Miroslav Pokorni

----- Original Message -----
From: "Don Black" <jeans@nex.net.au>
To: "Stan & Patricia Griffiths" <w7ni@easystreet.com>
Cc: "tbfowler100" <tfowler@mitretek.org>; "TekScopes"
<TekScopes@yahoogroups.com>
Sent: Tuesday, June 24, 2003 7:07 AM
Subject: Re: [TekScopes] Grain of wheat bulbs for scale illuminator in 2465
scope


Those lamps sound very similar to the early sharp VCR cassette lamps.
Generic
versions should be available for a fraction of Tektronix price. I'll have
to find
a catalogue to find the Sharp part number but perhaps someone else knows
where to
get them in the US. I'll also have to check their diameter in case they're
slightly fatter. Do they have flying leads or pigtails to solder into a PC
board?

Don Black.

Stan & Patricia Griffiths wrote:

Hi,

I'm behind a hundred or so emails so I don't know if you ever received
an
answer to this inquiry or not. Anyway, here is some info for you.

Tek's 1994 price for these incandescent bulbs (150-0057-01) was $5.95
each.
If you find some, at least you will have some idea of what they should
cost.
Tek procured their from the following company:

Oshino Electric Lamp Works Ltd.
52 Minami Shinagawa 2 Chome
Shinagawa Ku
Tokyo, Japan

Manufacturer's Part Number: OL715AS15TPL

The is part was used in many 2400 series and early 7K mainframes and
plugins.

It is rated at 5 volts at 115mA.

Estimated life is 50,000 hours.

I don't have any nor do I know where you can get them but the above info
may
help you locate some.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "tbfowler100" <tfowler@mitretek.org>
To: <TekScopes@yahoogroups.com>
Sent: Friday, June 13, 2003 4:50 PM
Subject: [TekScopes] Grain of wheat bulbs for scale illuminator in 2465
scope

Does anyone know where to get replacement bulbs for the scale
illuminator in a 2465 series scope? The bulbs are 2.5 mm, 115 ma,
5v, TEK part number 150-0057-01. Radio Shack doesn't seem to have
anything close, and I can't find anything in the model railroading
web sites either.





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http://docs.yahoo.com/info/terms/





Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/


Re: 545b/l20

Stan & Patricia Griffiths <w7ni@...>
 

Yes.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "kathnrich" <kathnrich@goes.com>
To: <TekScopes@yahoogroups.com>
Sent: Sunday, June 22, 2003 4:58 PM
Subject: [TekScopes] 545b/l20


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








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Re: Grain of wheat bulbs for scale illuminator in 2465 scope

Craig Sawyers <c.sawyers@...>
 

Those lamps sound very similar to the early sharp VCR cassette
lamps. Generic
versions should be available for a fraction of Tektronix price.
I'll have to find
a catalogue to find the Sharp part number but perhaps someone
else knows where to
get them in the US. I'll also have to check their diameter in case they're
slightly fatter. Do they have flying leads or pigtails to solder
into a PC board?
Both types, with the same spec that Stan quoted, are available from regular
electronics suppliers for small amounts of money. In the UK Farnell sell
them. There was some posts on this not so long ago, so check the archives.
Could be Allied that sell them in the US, maybe other places too.

Craig


Re: Grain of wheat bulbs for scale illuminator in 2465 scope

Don Black <jeans@...>
 

Those lamps sound very similar to the early sharp VCR cassette lamps. Generic
versions should be available for a fraction of Tektronix price. I'll have to find
a catalogue to find the Sharp part number but perhaps someone else knows where to
get them in the US. I'll also have to check their diameter in case they're
slightly fatter. Do they have flying leads or pigtails to solder into a PC board?

Don Black.

Stan & Patricia Griffiths wrote:

Hi,

I'm behind a hundred or so emails so I don't know if you ever received an
answer to this inquiry or not. Anyway, here is some info for you.

Tek's 1994 price for these incandescent bulbs (150-0057-01) was $5.95 each.
If you find some, at least you will have some idea of what they should cost.
Tek procured their from the following company:

Oshino Electric Lamp Works Ltd.
52 Minami Shinagawa 2 Chome
Shinagawa Ku
Tokyo, Japan

Manufacturer's Part Number: OL715AS15TPL

The is part was used in many 2400 series and early 7K mainframes and
plugins.

It is rated at 5 volts at 115mA.

Estimated life is 50,000 hours.

I don't have any nor do I know where you can get them but the above info may
help you locate some.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "tbfowler100" <tfowler@mitretek.org>
To: <TekScopes@yahoogroups.com>
Sent: Friday, June 13, 2003 4:50 PM
Subject: [TekScopes] Grain of wheat bulbs for scale illuminator in 2465
scope

Does anyone know where to get replacement bulbs for the scale
illuminator in a 2465 series scope? The bulbs are 2.5 mm, 115 ma,
5v, TEK part number 150-0057-01. Radio Shack doesn't seem to have
anything close, and I can't find anything in the model railroading
web sites either.





Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/





Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/


Re: Tektronix T935A (Time/Div Pancake Switch).

Stan & Patricia Griffiths <w7ni@...>
 

Hello DeNoris,

The information that I have says the263-0051-00 is used in the T932, T932A, T935, and 442 but not in the T935A.

My info also tells me the T935A uses a 263-0052-00 for a Time/Div switch.

In any case, I don't have either of them available.

I suggest you try Deane Kidd dektyr@teleport.com and the following web site: http://www.sphere.bc.ca

Stan
w7ni@easystreet.com

----- Original Message -----
From: D. W.
To: W7NI@easystreet.com
Sent: Saturday, June 14, 2003 3:41 PM
Subject: Tektronix T935A (Time/Div Pancake Switch).


Hello Stan:

This is DeNoris, I called on 6/13/03 & spoke with your wife about the above switch & she mentioned it might be best to email you. I would like to know if you or anyone else has the "Time/Div or Sweep switch" Tek's part no.: 263-0051-00 (Rotary switch (Pancake)) for the Model: T935A Oscillascope, serial #: B024054 & the price for it. Thank you for your time.

DeNoris


Re: Grain of wheat bulbs for scale illuminator in 2465 scope

Stan & Patricia Griffiths <w7ni@...>
 

Hi,

I'm behind a hundred or so emails so I don't know if you ever received an
answer to this inquiry or not. Anyway, here is some info for you.

Tek's 1994 price for these incandescent bulbs (150-0057-01) was $5.95 each.
If you find some, at least you will have some idea of what they should cost.
Tek procured their from the following company:

Oshino Electric Lamp Works Ltd.
52 Minami Shinagawa 2 Chome
Shinagawa Ku
Tokyo, Japan

Manufacturer's Part Number: OL715AS15TPL

The is part was used in many 2400 series and early 7K mainframes and
plugins.

It is rated at 5 volts at 115mA.

Estimated life is 50,000 hours.

I don't have any nor do I know where you can get them but the above info may
help you locate some.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "tbfowler100" <tfowler@mitretek.org>
To: <TekScopes@yahoogroups.com>
Sent: Friday, June 13, 2003 4:50 PM
Subject: [TekScopes] Grain of wheat bulbs for scale illuminator in 2465
scope


Does anyone know where to get replacement bulbs for the scale
illuminator in a 2465 series scope? The bulbs are 2.5 mm, 115 ma,
5v, TEK part number 150-0057-01. Radio Shack doesn't seem to have
anything close, and I can't find anything in the model railroading
web sites either.





Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/



Tek scopes, free or near free, in Chicago area (NW suburbs)

kentongreen <toyota.4x4@...>
 

I am moving, and no longer have the time or interest in keeping these
scopes, probes, manuals and plug-ins. If you are in the area, please
come over and pick up whatever you're interested in.
454A w blue phosphor #B010225, P6006, P6028 w/ manual
465 #B304887 w/ operators handbook
519 #000398, T519-P11 and manual
7904 #B246438 opt. 4, 78 no manuals
Q plug-in, #001404
L-30 plug-in, some knobs missing plastic
5A23N #B044241
5B10N #B020393
5A20N #B020265
7A16A #B010150
7B71 #B237080
7B10 #B010194
7B53A #B219878 opt. 5 w/ operators and service manual
7B50 #B174724 w/ 7B50A timebase and options manual
7B85 #B020742 and #B030862 w/ oper and svc manual
7A19 #B033800 w/manual
7B80 #B057615
manuals: R7903, 7834 (oper and svc), 7633 ('81 oper, '85 oper, svc),
7A26, C-50,51,52,53 manuals.

At one point in time I wanted a 7A29, 7B92A, 7A42, 7B15, and P6201,
P6042 probes. But no longer (just thought I'd mention things I like).

Price: nothing/free if there isn't much interest-- if I have 20
people pounding down my door, then maybe $50 for each mainframe,
$20/plug-in, $5/manual or something, just to separate the men from
the boys (those who are serious collectors vs. the merely curious).

Let me know, email kenton.green@att.net, if I hear nothing for a week
then I'll be begging someone to take everything together.

Later,
Kenton


Re: 475 ?

Stan & Patricia Griffiths <w7ni@...>
 

Hi Chris,

I don't recall seeing an answer to this question. Yes, 311-1411-00 is a
Tektronix Part Number. I don't happen to have one for you but you might try
these two places: Deane Kidd dektyr@teleport.com and this web site:
http://www.sphere.bc.ca

Use the Tek Part Number when asking if they have that item and tell them
where it is used (475 Horizontal Position).

Stan
w7ni@easystreet.com

----- Original Message -----
From: "Chris Ryskoski" <c_ryskoski@charter.net>
To: <TekScopes@yahoogroups.com>
Sent: Friday, June 06, 2003 3:26 PM
Subject: [TekScopes] 475 ?


Hi all, I picked up a used 475 and have been cleaning it up.I had
removed the knobs to scrub them and ran into a problem with the
Horizontal position pot.It seems something is not right with it as
the fine adj part turns infinitly plus the knob post pushes easily
[and completely] into the outer knob post.Is there a source for this
pot? I couldn't find a pn# listed in the service manual but it is a
Bourn and the no#s on the pot are 311-1411-00, 1K/10K ,8052m,
82c2ak32ba0006 .Is the 311-1411-00 the tek pn#? Any help would be
appreciated immensly.The scope works other than this problem and I
picked it up to learn with and use in my ham shack.Thanks ahead,Chris


500 Series Parts Scopes...

Curtis Taft <ctaft@...>
 

I've got a handfull of 500 series scopes that are available for parts. No tubes, just parts. I have a 549, 545B, 561, 543A and 535A. They are all complete except the 545B, which has no CRT or HV Power supply. I also have Plug-Ins (no tubes), including CA (x2), 2A63, 2B67, and a 1A1. Also have a full size 535A manual, full size CA Manual, and a mini 535A/545A Operators Handbook. I do have a bunch of the 6080 tubes, and can test them if anyone is interested.
Shipping for anything would be at cost, I don't charge extra for my time. I'd like to sell them as whole units, because if I remove a single part I'm kind of stuck with the rest of it. I'm in Columbus, OH, and you are welcome to pick items up. Make me an offer, I'm not out to break the bank with these, just make sure they are put to good use.

Curtis


Re: 2430 service manual

Chuanxiao Li \(Pholink\)
 

Thank Mighty excellent and detailed analysis (3 pages). I think the
TekScopes delete the attachment. If some one need 2430A military version
table of contents (I only have the table of the contents). I will email to
individual.

Li


581A/585A schematics/manual

coldvolcanouk <clintongodleman@...>
 

Please Help!

I need a copy of the circuit diagram for a Tek 581A.
I've got a problem with the vertical amplifier.
I've been told that the circuit diagram for the vertical amp in the 585A is
almost the same so if you have a copy that it might be helpful.
If you have a copy of the complete manual, original, copy or as an
adobe acrobat file I would be very interested.

Thanks!
Clint (London,England)

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