Date   

Re: Audiophile "spam"

John Miles <jmiles@...>
 

As far as the audio thing . i think some of it a bit
extreme....seems like
many of the audiophiles feel that the money that is spent on the
equipment
and wiring the better the sound will be.
The best comment I've ever heard on the subject (although it's somewhat
flamebait-ish): Music fans listen to the music. Audiophiles listen to the
equipment.

I remember seeing an article a few years ago ....think in wireless
world......and the author of the article tested many speaker cables for
several characteristics.....and found that an extension cord with
ends cut
off measured up the best. :)
Bob Pease at National Semiconductor, a man known for his horse sense, gave
the issue some thought at one point. If I remember correctly, he concluded
that the best-possible speaker cable would be a computer-style ribbon cable
with alternating conductors tied together to form a 2-conductor Litz-style
cable.

Sorry this is a bit off topic too....however, think that is part
of fun of
this group, relating some of each of our unique background in electronics
too.
Agreed 100%. Tek scopes *do* have uses besides troubleshooting other Tek
scopes. :)

-- john KE5FX


Re: 7D20

spence@...
 

Robert,



The Op Manual says that the preferred position is the three right hand
slots. I have an electronic copy of the Op Manual that I can email if you
need it.



Jeff

-----Original Message-----
From: Robert Morein [mailto:morepub@comcast.net]
Sent: Monday, November 24, 2003 9:40 AM
To: Tekscopes@yahoogroups.com
Subject: [TekScopes] 7D20



When installing a 7D20 in a four compartment mainframe, should it be up
against the left or the right?
I take it the remaining compartment is not functional in any way?

Any source for cover panels?








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7D20

Robert Morein <morepub@...>
 

When installing a 7D20 in a four compartment mainframe, should it be up against the left or the right?
I take it the remaining compartment is not functional in any way?

Any source for cover panels?


Re: Audiophile "spam"

tss_steve_990
 

John,

Thanks for your comments.

I do not think the group is malicious at all, they just need to spread the humor around to a variety of foibles. My complaint was that the audiophile cracks are recurring in thread after thread. I think we have exhausted all the humor there is to be had in oxygen free copper wire and reverse spinning electrons, etc. It was funny the first five or six times.

I am interested in photography and have a collection of Canon professional and Haselblad (Zeiss) lens. Both take excellent but, ask me to tell them apart in a "blind test", I can not. Before I get corrected, a blind test is not much use in photography ;-).
The analogy to camera equipment is actually apt. Much commercial (including professional) equipment has circuitry that can be compared to a cardboard box single use camera. The resulting prints are totally acceptable to the majority of consumers, even though the resolution, chromatic aberration, focus and everything about the picture is medoicre.

If you take your large-format Hasselblad and take a slightly out-of-focus picture, however, you are immediately aware of the fact that it is out of focus--the higher resolution makes the focus problem immediately apparent. In a similar way, in a low distortion audio system, one is able to hear subtle changes that would be obscured in a fuzzier "sound photo". In the high-resolution systems I work on, I am able to hear much more subtle changes than I can on my own humble boombox.
Human hearing has a much wider dynamic range than vision, by the way. In video a 50 dB signal to noise ratio is considered plenty. In audio it isn't nearly good enough even for cheap commercial systems.

I am also question about audiophiles quest for equipment that improves the sound that is better than the equipment that was used to record it origianlly.
My comment about seeking equipment better than that used to record the music is that in the case of most commercial recordings that will always be true. The stuff used in most studios isn't really very good. The high resolution systems actually expose the poor quality of many recordings, but on the ones that are very carefully recorded with really good gear, the music can be very realistic and satisfying indeed. Playing back crap on a crappy system makes the whole thing even crappier. The distortions are additive.

Best wishes to all in our group,

Steve


Re: Audiophile "spam"

eboytoronto
 

I am sorry that members of the group have have caused offense. I sure that they do not have malicous intent towards audiophiles.

I am interested in photography and have a collection of Canon professional and Haselblad (Zeiss) lens. Both take excellent but, ask me to tell them apart in a "blind test", I can not. Before I get corrected, a blind test is not much use in photography ;-).

Myself, I am not blessed with the ears to be able to detect the difference that these kind of modifications make. I do not have a love of music. Perhaps if I did I would be a better person.

As a practicing design engineer I do have the following believes:

I am sure that the mass market component engineers are not concerned about how good their capacitors sound, and for the majority of applications it is not important. It is therefore possible that some capacitors do sound better than others.

I am also question about audiophiles quest for equipment that improves the sound that is better than the equipment that was used to record it origianlly.

I subscribe to the magzine Electronics World, (formerly Wireless World), for its 'other content'. I have read many of the audiophile
articles and I am interested by the techniques that are used to measure the components.

I am sure that the quest for the perfect sound is a rewarding and interesting. Apart from being damaging the wallet, it is harmless to society and the environment.

I hope on balance that you find the tekscopes forum a rewarding experience.

Sincerely,


John Barnes.

Incidently I can report that replacing the recitifiers in a power supply, with fast recovery diodes, DOES reduce the noise conducted back on the line. This was determined will performing EMC measurements on large industrial power supplies.


----Original Message Follows----
From: "Steve Hogan" <stevehogan@soundsteward.com>
Reply-To: "Steve Hogan" <stevehogan@soundsteward.com>
To: <Tekscopes@yahoogroups.com>
Subject: [TekScopes] Audiophile "spam"
Date: Sun, 23 Nov 2003 21:53:09 -0800

The only thing more irritating to read on this board than the occasional
porno-spammer is the group of participants that find it necessary to spend
whole threads making jokes about audiophiles. An informative discussion re:
black beauty caps and the comment that Stan sold them to some audiophile
starts the whole yuk yuk about oxygen free copper yuk yuk etc. etc. I feel
like I'm on a board with a bunch of old retired deaf guys debating if there
there really is such a thing as sound.

The post re: the whining capacitors in an industrial application is an
example that there are often effects that can be heard by those who have a
practiced ear, but the scientific explanation for what is being heard is
lagging far behind. To discount out of hand that the differences being
heard are imagined or not there is really just as unscientific as many of
the marketing types who have devised ways of parting music lovers and their
money.
It would be a lot more fun in this group if we were to stick to scopes and
other stuff which the majority in this group have real knowledge to share.

I will now duck and cover.

Steve Hogan




_________________________________________________________________
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connection! Prices start at less than $1 a day average.
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Re: Audiophile "spam"

Mark Anton
 

To a certain extent. a bit of diversion is alright too....We have and do use our tek scopes to repair other stuff too. and is neat to hear about others experiences in the field of electronics.

As far as the audio thing . i think some of it a bit extreme....seems like many of the audiophiles feel that the money that is spent on the equipment and wiring the better the sound will be.

I remember seeing an article a few years ago ....think in wireless world......and the author of the article tested many speaker cables for several characteristics.....and found that an extension cord with ends cut off measured up the best. :)

Sorry this is a bit off topic too....however, think that is part of fun of this group, relating some of each of our unique background in electronics too.

The porn spam i could do without. But really not all that many......would have to say the good outweigh the bad here. :)

Take care

Mark



Mark Anton, Owner
Heights TV & VCR Service
3946 Central Ave. NE
Columbia Heights MN, 55421

Phone is 763-789-1767







----Original Message Follows----
From: "Steve Hogan" <stevehogan@soundsteward.com>
Reply-To: "Steve Hogan" <stevehogan@soundsteward.com>
To: <Tekscopes@yahoogroups.com>
Subject: [TekScopes] Audiophile "spam"
Date: Sun, 23 Nov 2003 21:53:09 -0800

The only thing more irritating to read on this board than the occasional porno-spammer is the group of participants that find it necessary to spend whole threads making jokes about audiophiles. An informative discussion re: black beauty caps and the comment that Stan sold them to some audiophile starts the whole yuk yuk about oxygen free copper yuk yuk etc. etc. I feel like I'm on a board with a bunch of old retired deaf guys debating if there there really is such a thing as sound.

The post re: the whining capacitors in an industrial application is an example that there are often effects that can be heard by those who have a practiced ear, but the scientific explanation for what is being heard is lagging far behind. To discount out of hand that the differences being heard are imagined or not there is really just as unscientific as many of the marketing types who have devised ways of parting music lovers and their money.
It would be a lot more fun in this group if we were to stick to scopes and other stuff which the majority in this group have real knowledge to share.

I will now duck and cover.

Steve Hogan




_________________________________________________________________
Say �goodbye� to busy signals and slow downloads with a high-speed Internet connection! Prices start at less than $1 a day average. https://broadband.msn.com (Prices may vary by service area.)


Re: Audiophile "spam"

Jeff W <vwthingy@...>
 

Steve Hogan wrote:

It would be a lot more fun in this group if we were to stick to
scopes and other stuff which the majority in this group have real
knowledge to share.

So why did you start this inflammatory thread? Please stay on topic.

Jeff


Audiophile "spam"

tss_steve_990
 

The only thing more irritating to read on this board than the occasional porno-spammer is the group of participants that find it necessary to spend whole threads making jokes about audiophiles. An informative discussion re: black beauty caps and the comment that Stan sold them to some audiophile starts the whole yuk yuk about oxygen free copper yuk yuk etc. etc. I feel like I'm on a board with a bunch of old retired deaf guys debating if there there really is such a thing as sound.

The post re: the whining capacitors in an industrial application is an example that there are often effects that can be heard by those who have a practiced ear, but the scientific explanation for what is being heard is lagging far behind. To discount out of hand that the differences being heard are imagined or not there is really just as unscientific as many of the marketing types who have devised ways of parting music lovers and their money.
It would be a lot more fun in this group if we were to stick to scopes and other stuff which the majority in this group have real knowledge to share.

I will now duck and cover.

Steve Hogan


Re: Black Beauty Caps

Miroslav Pokorni
 

Hello Stan,

How do you know that your audiophile customers actually connected those
Black Beauties to circuit? Maybe they just placed them in amplifier for
looks. Do you remember those '7 transistor radios', from 60s. The radio
circuit used just 6 transistors and the 7th was soldered to three pads
isolated from rest of radio. That was not a spare tire, it was to pacify
Federal Trade Commission that declaration on the box was not misleading.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Stan & Patricia Griffiths" <w7ni@easystreet.com>
To: "George Headley" <georgeheadley@mybluelight.com>
Cc: "TekScopes" <TekScopes@yahoogroups.com>
Sent: Sunday, November 23, 2003 1:20 AM
Subject: Re: [TekScopes] Black Beauty Caps


Hi George,

The first time I was exposed to the "Black Beauty" was when they were
discussed by the more experienced technicians in the Tektronix Factory
Service area that I worked in in 1961. At that time, I thought it was
just
a slang term for a certain type of leaky capacitor that was oil filled and
leaked . . . both oil and electrically. I later found out that "Black
Beauty" is actually a term used by Sprague for a line of capacitors they
made during the decade of the 50's and Tek used a lot of them. Most of
the
common values from about 0.1 uf to 0.005 uf in voltages of 200-600 volts
had
black bodies and painted stripes (like a resistor) for color coding the
value and voltage rating. The higher voltage rated ones, like 3kv to 10
kv
also had black bodies but the values and voltage ratings were printed on
them. I have seen the high voltage ones printed in both yellow and red
and
I am not certain that both of these are really "Black Beauties", but they
both tend to leak.

I noticed a note here on TekScopes recently (from Stan McIntosh) where he
indicated they also came in burgundy. Tek did use some burgundy caps in
some power supplies but I think they were made by Good-All. I have not
known the Good-All caps to leak (with one or two exceptions) in my 40
years
of experience with them. I thnk the "Black Beauty" name is a Sprague
tradename and would not be used by any other company.

By the way, many audiophiles just LOVE "Black Beauty" caps because they
think that is how they will get the "old sound" from their tube-type hifi
amps. They especially love the 0.015uf at 400 volt size. I have sold
some
of those salvaged out of Tek scopes for as much as $15 for a pair,
describing them as accurately as I could without calling them outright
"garbage" . . . although that is what they are to me . . . No audiophile
has ever complained to me that he is not satisfied with the "Black
Beauties"
he has gotten from me. I am certainly happier with the money . . .

Stan
w7ni@easystreet.com

----- Original Message -----
From: "George Headley" <georgeheadley@mybluelight.com>
To: <TekScopes@yahoogroups.com>
Sent: Saturday, November 22, 2003 1:59 PM
Subject: [TekScopes] Black Beauty Caps


Hello group: I have seen repeated references to the "Black Beauty" caps.
I
have tried to figure out the way to recognize these things from the
different messages but still don't have a clue. I enjoy working on the 400
series of Tektronix because I spent a great deal of my youth hunkered down
in very cold computer rooms staring at these scopes and designing traps to
catch that one glitch that proved or dis proved a theory.
Did they use these particular caps in the 465 series or were they just a
problem in the tube types with the higher voltages.
I really appreciate you allowing me to sit on the side lines and listen
to
the tales. Every time I see the sticker at the front/top of a Tek scope I
wonder if that guy is one of you.
If you can educate me on the black beauty I will sleep like a baby
tonight.
George Headley

Sign up for Internet Service under $10 dollars a month, at
http://isp.BlueLight.com




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Re: Black Beauty Caps

 

Craig Sawyers wrote:
understand why a good example might audition well in listening tests. Still
made, at ludicrous price by for example Audionote
http://www.hificollective.co.uk/components/paper_in_oils.html
Audionote paper-in-oil caps are made by Jensen in Denmark, IINM.

-Dan


Re: Black Beauty Caps

Craig Sawyers <c.sawyers@...>
 

By the way, many audiophiles just LOVE "Black Beauty" caps because they
think that is how they will get the "old sound" from their tube-type hifi
amps.
That *may* all sound like audiophile nonsense - but...

Around 15 years ago, I developed a security gate product for use in
supermarkets for a company called Esselte. This used an energising current
in the form of a triangle wave at 20Hz with either a 3.3kHz or 5kHz sine
wave superimposed. The current came from a class D FET amplifier, where the
output was essentially a duty cycle modulated digital waveform. Between the
amp and the coils (between which you walk) was a passive filter. First
problem was that filter shrieked very loudly right in the middle of the
ear's most sensitive region. First thing was magnetostriction in the coil
cores (ferrite). Second thing was the capacitors.

What became clear very quickly was that the constuction and dielectric in
the capacitors had a major effect on the amount of sound radiated when a few
amps are passed. After some experimentation, it became clear that well
regarded "audiophile" capacitors were very quiet indeed. These were
characterised by using a low-loss dielectric (polypropylene), tubular
construction, and very tight winding of the foil. Non-tubular construction
was worse, as were lossier dielectrics (polycarbonate or polyester), or less
tight winding. The worst examples shrieked like the proverbial banshee.

Of course this consitutes a loss mechanism - energy is being extracted at
the mechanical resonant frequencies of the capacitor structure - and thus
specific frequencies in the audio spectrum are either attenuated, phase
shifted and/or distorted.

Now, I think that the logic behind the audio qualities of oil and paper
capacitors is that the mechanical losses in both the paper, and the damping
introduced by the oil dramatically reduce the Q of the resonances. Lifetime
and failure mechanisms notwithstanding, and plague of Tek (and other 50's
vintage gear - UK listers will thing of Hunts caps) to one side, I can
understand why a good example might audition well in listening tests. Still
made, at ludicrous price by for example Audionote
http://www.hificollective.co.uk/components/paper_in_oils.html

Craig


Re: Tek 465B with less than good focus

 

--- In TekScopes@yahoogroups.com, "George Headley" <georgeheadley@m...> wrote:
Hello Group: This is my first post but I feel that I know all of the regulars. I'm very impressed with your knowledge and have learned
a
lot from your experiences. I an an old computer tech , retired but not ready to give up the challenges relating to Tektronix scopes. I
have been buying them mostly for the challenges found in the repairs but somewhat out of respect for equipment that is fun to work
on
because of the quality. I have several 465B that have poor focus. Not really bad but not good enough. There is some improvement
when I limit to 20MHz. I dont have a HV probe but I suspect HV problems. I know from experience that low HV will cause a blooming
of the trace. I have adjusted the CRT bias as per the manual. Slight improvement, astig and sweep ckts within spec. If I can trouble
you for a minute of your time do you have any suggestions. one more thing , it may be my imagination but the rise and fall lines seem
to be sharper than the time base lines..
George Headley
The Broadband noise of the amplifiers often makes the beam to apear "thick" and "out of focus".
As you describe, if you limit the bandwith, it reduces the tracewith significant, than the tracewith is
caused by the broadband (johnson et al) noise from the vertical amplifiers and other noise sources (resistors)
inside the vertical chain.
In my opinion, if you could see a significant difference between ful bandwith and bwl it to abt 20MHz than
the focus is usualy good.
But also not to forget is the astigmatism control, also often correctible (inside) which influences the trace thickness,
but not soo big as the focus does.

Jorgen
dj0ud


Re: Black Beauty Caps

George Headley
 

Thank you Patricia for a great description. That helps me a lot. I guess the whipper-snapper generation of 465 scopes didn't use many of that type,I haven't seen any so far that fit the description although I have found leaky caps to be about the most common problem. I have bought 7 scopes now thinking that the next one would be a "parts scope" Except for one 466,I have been able to repair all of them. After spending a great deal of time cleaning and repairing I don't want to get rid of them. I don't guess I'll make my late fortune with that plan. Thanks again, you folks are great. (Some of you are a little wierd but we gotta love ya).
George

Sign up for Internet Service under $10 dollars a month, at http://isp.BlueLight.com


Re: Black Beauty Caps

Ashton Brown <ashton@...>
 

Dave Henderson wrote:

<SNIP>


By the way, many audiophiles just LOVE "Black Beauty" caps because they
think that is how they will get the "old sound" from their tube-type hifi
amps. They especially love the 0.015uf at 400 volt size. I have sold some
of those salvaged out of Tek scopes for as much as $15 for a pair,
describing them as accurately as I could without calling them outright
"garbage" . . . although that is what they are to me . . . No audiophile
has ever complained to me that he is not satisfied with the "Black Beauties"
he has gotten from me. I am certainly happier with the money . . .

Stan
w7ni@easystreet.com
Stan

They have less trouble with the Black Beauties than we scope an radio guys do because they use that special "oxygen free wire" they are always talking about to hook em up with ;^)
Aha, I see that Advanced Audio must be re- 'splained to you nonBelievers:

See - there's this "oxiation - reduction" thing which happens in chemistry.
So then - If "oxidation" is "loss of electrons" and
ya buys yerself some o' that OFHC wire {cause, mainly; it be *expensive* and that == Good}
Then:

That Black Beauty er "leakeage" starts fillin-up all that Oxy-depleted Urani^h^h er Copper.
And everything is OK!

Except, over time, why - those ex-Oxy 'holes' become filled,
(That's OK - a Meta-Audio system demands regular contemplation and massage)
SO: it's time to wheedle a New Set of Black Beaties outta Stan!
(thus assuring too, that Stan will not be pushin a grocery cart down by the bridge)


Now I just Know yer gonna say,
"er, wouldn't this Masterful-Theory require that you replace the OFHC *wires*, then ?"
(Nope - meta-Audio doesn't follow such namby pamby logical Rules, Poo--Poo Head!)


HTH,

Ashton


Re: Black Beauty Caps

Dave Henderson <nr1dx@...>
 

<SNIP>

By the way, many audiophiles just LOVE "Black Beauty" caps because they
think that is how they will get the "old sound" from their tube-type hifi
amps. They especially love the 0.015uf at 400 volt size. I have sold some
of those salvaged out of Tek scopes for as much as $15 for a pair,
describing them as accurately as I could without calling them outright
"garbage" . . . although that is what they are to me . . . No audiophile
has ever complained to me that he is not satisfied with the "Black Beauties"
he has gotten from me. I am certainly happier with the money . . .

Stan
w7ni@easystreet.com
Stan

They have less trouble with the Black Beauties than we scope an radio guys do because they use that special "oxygen free wire" they are always talking about to hook em up with ;^)


Re: Black Beauty Caps

Stan & Patricia Griffiths <w7ni@...>
 

Hi George,

The first time I was exposed to the "Black Beauty" was when they were
discussed by the more experienced technicians in the Tektronix Factory
Service area that I worked in in 1961. At that time, I thought it was just
a slang term for a certain type of leaky capacitor that was oil filled and
leaked . . . both oil and electrically. I later found out that "Black
Beauty" is actually a term used by Sprague for a line of capacitors they
made during the decade of the 50's and Tek used a lot of them. Most of the
common values from about 0.1 uf to 0.005 uf in voltages of 200-600 volts had
black bodies and painted stripes (like a resistor) for color coding the
value and voltage rating. The higher voltage rated ones, like 3kv to 10 kv
also had black bodies but the values and voltage ratings were printed on
them. I have seen the high voltage ones printed in both yellow and red and
I am not certain that both of these are really "Black Beauties", but they
both tend to leak.

I noticed a note here on TekScopes recently (from Stan McIntosh) where he
indicated they also came in burgundy. Tek did use some burgundy caps in
some power supplies but I think they were made by Good-All. I have not
known the Good-All caps to leak (with one or two exceptions) in my 40 years
of experience with them. I thnk the "Black Beauty" name is a Sprague
tradename and would not be used by any other company.

By the way, many audiophiles just LOVE "Black Beauty" caps because they
think that is how they will get the "old sound" from their tube-type hifi
amps. They especially love the 0.015uf at 400 volt size. I have sold some
of those salvaged out of Tek scopes for as much as $15 for a pair,
describing them as accurately as I could without calling them outright
"garbage" . . . although that is what they are to me . . . No audiophile
has ever complained to me that he is not satisfied with the "Black Beauties"
he has gotten from me. I am certainly happier with the money . . .

Stan
w7ni@easystreet.com

----- Original Message -----
From: "George Headley" <georgeheadley@mybluelight.com>
To: <TekScopes@yahoogroups.com>
Sent: Saturday, November 22, 2003 1:59 PM
Subject: [TekScopes] Black Beauty Caps


Hello group: I have seen repeated references to the "Black Beauty" caps. I
have tried to figure out the way to recognize these things from the
different messages but still don't have a clue. I enjoy working on the 400
series of Tektronix because I spent a great deal of my youth hunkered down
in very cold computer rooms staring at these scopes and designing traps to
catch that one glitch that proved or dis proved a theory.
Did they use these particular caps in the 465 series or were they just a
problem in the tube types with the higher voltages.
I really appreciate you allowing me to sit on the side lines and listen to
the tales. Every time I see the sticker at the front/top of a Tek scope I
wonder if that guy is one of you.
If you can educate me on the black beauty I will sleep like a baby
tonight.
George Headley

Sign up for Internet Service under $10 dollars a month, at
http://isp.BlueLight.com




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



Re: TeK 453 Scope Questions Please Help?

Stan & Patricia Griffiths <w7ni@...>
 

One thing you can check, Jon, is that the pin connections to the CRT neck
are secure. I have seen these come off in transit. I also have to
emphasize that 90% of ALL scope prblems are in the power supplies. You will
need a manual if you don't have one. The first thing to do is check to make
sure the power supplies are working correctly. All bets are off unless the
power supplies are working correctly. The correct operation of the power
supplies is critical to every other circuit in the scope so you must start
there.

Ask again, when you have a manual and have confirmed correct power supply
operation.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "jonkzak" <jonkzak@yahoo.com>
To: <TekScopes@yahoogroups.com>
Sent: Monday, November 17, 2003 9:33 AM
Subject: [TekScopes] TeK 453 Scope Questions Please Help?


All,

I've just received my used 453 and when I turned it on The only way
to get a trace is to hold the trace find button down and then the
trace is very small located on the right side of the screen. I did
open the covers and just looked around to see if anything looked
burned etc. I did notice this effect. When I toggle the on/off
switch to 'on' there is a lamp located on the bottom pc board that
will flash on then off and stays off. Turning the on/off switch
to 'off' will also flash this lamp. I don't know if this is normal
or not. Also all other pilots on the front of the scope function as
normal. The small trace does seem to look correct using the
calibrate signal as input. Any help would be greatly appreciated.
I'm sure that this has been covered but my search has not resulted in
any hits.

Best Regards,

Jon





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



Black Beauty Caps

George Headley
 

Hello group: I have seen repeated references to the "Black Beauty" caps. I have tried to figure out the way to recognize these things from the different messages but still don't have a clue. I enjoy working on the 400 series of Tektronix because I spent a great deal of my youth hunkered down in very cold computer rooms staring at these scopes and designing traps to catch that one glitch that proved or dis proved a theory.
Did they use these particular caps in the 465 series or were they just a problem in the tube types with the higher voltages.
I really appreciate you allowing me to sit on the side lines and listen to the tales. Every time I see the sticker at the front/top of a Tek scope I wonder if that guy is one of you.
If you can educate me on the black beauty I will sleep like a baby tonight.
George Headley

Sign up for Internet Service under $10 dollars a month, at http://isp.BlueLight.com


Re: Tek 310 Power Supply

Ashton Brown <ashton@...>
 

** Yeay !!! **

This-all reminds me of (a friend) doing the cam followers for a Bugatti engine.
Sig. Ettore correctly reasoned that, the entire force on the effectively 2-D cam lobe - should be in shear. Not just "the integral of the circular cross-section" as behaves that way:
ALL. In 'shear'.

Correspondingly, He {caps advised} decreed that The Followers Shalt Be Square in their cross-section.
And They Were.

(thus, any future wear or other problem, necessitated the ritual known as "the Pouring of the Babbit" (No not That! S. Lewis 'Babbitt' guy))
Then: the meticulous hand scraping of that square-bore until it Was Square - and also Not Loose. Or pour it again.

{sigh}

Yep, reminds me of trying to resuscitate a Victoreen Area Monitor (radiation) and deconstructing 'til the only possible reason for That short was - a turn-to-turn short of That interstage transformer to a (2N404?) Unwind, measure length, mic gauge.. yada yada et Voila -- a ~$3200 (labour) working relic of the Pantex / Silkwood atom era. Ready for any next atom era.


Kudos,

Ashton


stan mcintosh wrote:

Maybe, I finally have it right. My voltages are:
nominal actual
-150 -150.3
+100 +99.3
+300 +301.5

Close enough, right?

I'm really embarrassed about the cause. I forgot that not all caps of the Black Beauty construction are marked clearly as such. Some are marked like resistors, and some come in burgundy. I should have realized the color variation, sooner. I have a few NOS sinus-infection green caps. Two were leaky.

Thanks.

stan


Tek 310 Power Supply

stan mcintosh <mcintosh@...>
 

Maybe, I finally have it right. My voltages are:

nominal actual
-150 -150.3
+100 +99.3
+300 +301.5

Close enough, right?

I'm really embarrassed about the cause. I forgot that not all caps of the Black Beauty construction are marked clearly as such. Some are marked like resistors, and some come in burgundy. I should have realized the color variation, sooner. I have a few NOS sinus-infection green caps. Two were leaky.

Thanks.

stan

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