Date   

Re: Manual for CA type plug in

Craig Sawyers <c.sawyers@...>
 

the problem with the preamp is on CH A, which does not
produce enough gain. Even with the trim pot at maximum CH A only
produces
about half the gain it should. It could be a valve or a
resistor, but I need
a service manual to try and track the fault down.
Hi

Why not swap valves from one channel to another - if you haven't got a valve
tester this is an easy way to check.

The ones to swap are:

V3323 - V4323 (input cathode follower, 6AK5)
V3334 - V4334 (input amplifier, 12AU6)
V3354 - V4354 (input amplifier, 12AU6)
V3364 - V4364 (output amplifier, 6AU6)
V3374 - V4374 (output amplifier, 6AU6)

Other valves are to do with mode switching, so if your problem is to do with
gain on the A channel only, it is unlikely that there is a fault there.

The input and output amplifiers are arranged as long-tailed pairs. The gain
adjusts (front panel, and preset) act in the common cathode resistor network
of the input amplifier.

The other check is to measure the values of the resistors. It isn't unknown
for one of these to go either high R, or open. Plus a couple of problems I
found in other plug ins had to do with a broken wire - found by using a
magnifying glass and wobbing things until I located the culprit - although
these usually resulted in intermittent behaviour.

Good luck!

Craig


Re: File - Posting Rules

John Miles <jmiles@...>
 

I think he's just using a standard group-guidelines template... it probably
shouldn't be taken quite that personally. :)

-- jm

If I'm missing something about the Requirement for Neatness, please
enlighten. Else - why not try lightening up? This ISN'T rocket science
or The Physical Review Letters.


Re: File - Posting Rules

Ashton Brown <ashton@...>
 

Hello again Michael,

Here's another "Yahoo Group" - with ~ 900 members and apparently, pretty much ignoring the Authoritative Organization of Posting Protocol which - it seems is not so much about 'Yahoo Rulez' as about yours (?) That is, while theirs is obviously often a thoroughly irresponsible waste of BW, via unnecessary quoting of previous:

http://groups.yahoo.com/group/acuravigorandlegendclub/messages/

Nobody minds a lot - and nobody seems destined to have to do a lot of cleanup after them, either.

I've noticed nothing excessive at Tek in the way of "personal replies" , as you appear to be obsessed with. What is this about? Sometimes a message from one member to the other (accidental or otherwise) - also has its technical, informative content. And so does a #$%^& sense of proportionality and *humor*.

You are sounding like a genuine curmudgeon or worse - a Martinet schoolmaster - especially by comparison with what obviously IS tolerable = Has Been tolerated for.. a couple years by the Hosts of all the Groups. Think a bloody oscilloscope is a more complex device than a car? Note the quality of some of the mechanical diagnoses, deductions... amidst the juvenile badinage. (And I ain't 20-something either; closer to 60-something... and I see that these folks who drive what I also recently happened to acquire: are simply Enjoying themselves, y'know?)

If I'm missing something about the Requirement for Neatness, please enlighten. Else - why not try lightening up? This ISN'T rocket science or The Physical Review Letters.


Cheers,

Ashton Brown
ex-LBL, ex-Cal Tech; prolly got more Tek scopes right chere than You have. as in {sheesh}


TekScopes@yahoogroups.com wrote:

Please edit any posts/replies to the list to minimize quoted material.

Please do not send personal replies to the list. List replies go to the list by default. To reply only to a message's sender, either cut and paste their name, reply to all and delete "TekScopes", or use a reply-to-sender function if your email client has it.

Those congesting the list with with either of the above will have posting rights revoked
or moderated. Only by following these simple rules will we have a "clean" archive.
They also reduce inbox clutter and make digests much nicer to read.

If you do not wish to belong to TekScopes, you may unsubscribe by sending an email to
TekScopes-unsubscribe@yahoogroups.com

You may also visit the Yahoo web site to modify your subscriptions:

http://groups.yahoo.com/mygroups

Check out the files, bookmarks, and photos sections, and remember, you can search the group's archives from its home page,
or when reading messages. The group's home is at: http://groups.yahoo.com/group/TekScopes

Regards,
Michael Dunn
Moderator, TekScopes


File - Posting Rules

TekScopes@...
 

Please edit any posts/replies to the list to
minimize quoted material.

Please do not send personal replies to the list.
List replies go to the list by default. To reply only to a message's
sender, either cut and paste their name, reply to all and delete
"TekScopes", or use a reply-to-sender function if your email client
has it.

Those congesting the list with with either of the above will have posting rights revoked
or moderated. Only by following these simple rules will we have a "clean" archive.
They also reduce inbox clutter and make digests much nicer to read.

If you do not wish to belong to TekScopes, you may
unsubscribe by sending an email to

TekScopes-unsubscribe@yahoogroups.com

You may also visit the Yahoo web site to modify your
subscriptions:

http://groups.yahoo.com/mygroups

Check out the files, bookmarks, and photos sections,
and remember, you can search the group's archives from its home page,
or when reading messages. The group's home is at: http://groups.yahoo.com/group/TekScopes

Regards,
Michael Dunn
Moderator, TekScopes


Re: Manual for CA type plug in

sjhel@...
 

Hi Neville, the problem with the preamp is on CH A, which does not
produce enough gain. Even with the trim pot at maximum CH A only produces
about half the gain it should. It could be a valve or a resistor, but I need
a service manual to try and track the fault down.

I would be very interested in buying one of your CA manuals, let me
know how much you want for one.

Many thanks

Stuart Hellier


List change

Michael Dunn <mdunn@...>
 

OK, I've finally changed the operation of the list. Replies now only go to the original sender by default. If you want to also reply to the list, use Reply-to-all (or whatever it's called in your mailer), or manually add the TekScopes address. Do this if your reply would be of interest to the list. Otherwise, just reply to the sender.

For some reason, one or two people were concerned this would increase spam sent to posters, but that's unlikely. As the list was, a poster's email address is in the From: field; TekScopes is in the Reply-To. All the change does is remove the Reply-To: field.

If this doesn't work out, it can always be changed back...

Michael


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Re: Manual for CA type plug in

nifty58au
 

Stuart

I have a manual for a CA module
What specific part of the manual did you require as I can scan it for
you and email it to you.
I do have 2 copies of this manual and I may sell if the price is
right.
Neville






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Re: Manual for CA type plug in

Phil (VA3UX) <phil@...>
 

I might have a spare Stuart. Let me check.

Phil

At 09:27 AM 5/23/2002 -0400, you wrote:
Hi Guys, I fixed the problem with my 545B, it was just a blown resistor in
the power supply, I just need to check a fault in my dual trace CA plug in.
I was just wondering if anyone knows where I can get hold of a service manual
for a type CA plug in.
I look forward to hearing from someone!

Many Thanks

Stuart Hellier





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crt's

Phil (VA3UX) <phil@...>
 

Gents,

Please read below and reply directly to Kurt if you have any wants.

Tnx

Phil

From: "khageman" <andpower@copper.net>
To: <phil@vaxxine.com>
Subject: crt's
Date: Mon, 20 May 2002 17:00:29 -0700
X-Mailer: Microsoft Outlook Express 6.00.2600.0000
X-Spam-Status: No, hits=2.0 required=7.0 tests=RCVD_IN_OSIRUSOFT_COM
version=2.20
X-Spam-Level: **

Phil,

Are you enterested in any of the following?


H.P. 5083-0053 CRT for H.P. 120AR oscilloscope (new)



Tektronix 154-0514-10 CRT and accessories for 529 & RM529 video waveform
monitor (New in box)



JAN CRC-3KP1 CRT, RCA, new

Sylvania SC4348P31 CRT, rectangular with scale, new

Thank You,
-Kurt Hageman


Tek probes question,,,

KathnRich <kathnrich@...>
 

Would anyone know what the model Tek P6131 probes in excellent condition are worth?
Thanks,,,Rich


Re: Manual for CA type plug in

KathnRich <kathnrich@...>
 

What was the CA module. I have Tektonix manuals and do not see that type.
Rich,,

----- Original Message -----
From: sjhel@aol.com
To: tekscopes@yahoogroups.com
Sent: Thursday, May 23, 2002 06:27 AM
Subject: [TekScopes] Manual for CA type plug in


Hi Guys, I fixed the problem with my 545B, it was just a blown resistor in
the power supply, I just need to check a fault in my dual trace CA plug in.
I was just wondering if anyone knows where I can get hold of a service manual
for a type CA plug in.
I look forward to hearing from someone!

Many Thanks

Stuart Hellier




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Re: Which probes for 485?

Craig Sawyers <c.sawyers@...>
 

What probes work best with 485?
P6106 and ???
My 1973 Tektronix Catalog says probes were not supplied with
the 485,
P6201 FET
probe, and the P6056 and the P6057. (These last two provide
the full 350 MHz bandwidth, but have an input impedance of
500 ohms and 5000 ohms with only 1 pF Capacitance.)
More than that, but limited by the 'scope bandwidth. The P6201 will do over
1GHz at room temperature, the P6056 a whopping 3.5GHz and the P6057 1.4GHz.

Craig


Re: Which probes for 485?

Ray Menke <rndmenke@...>
 

On Tue, May 21, 2002 at 05:34:34PM -0000, r_brothers wrote:
What probes work best with 485?
P6106 and ???
My 1973 Tektronix Catalog says probes were not supplied with
the 485, but should be ordered separately according to the
application. A table then lists the P6053A or the P6201 FET
probe, and the P6056 and the P6057. (These last two provide
the full 350 MHz bandwidth, but have an input impedance of
500 ohms and 5000 ohms with only 1 pF Capacitance.)
The 3.5 foot P6053A will provide about 250 MHz, while the 9 foot
version gives about 215 MHz system bandwidth.
The vertical amplifier specs show a 1 Meg ohm (within 1%) paralleled
by approx. 20 pF as the high impedance input, so you could use
modern probes that would compensate that value. (Unless you
are a perfectionist...I'm thinking about some scopes that were
specified to have a certain swept frequency bandwidth at the
probe tip...so the probes could be "peaked" to compensate for
a "dip" in the scope's frequency response.) I might also add
that there is a bit of magic involved when using active probes
with an oscilloscope. Some probes will have a bias offset knob...
some will have a small dynamic range, and you have to stay
within that range to get good measurements.

--
Ray Menke
Retired Tek Field Engineer (1969-1997)


Manual for CA type plug in

sjhel@...
 

Hi Guys, I fixed the problem with my 545B, it was just a blown resistor in
the power supply, I just need to check a fault in my dual trace CA plug in.
I was just wondering if anyone knows where I can get hold of a service manual
for a type CA plug in.
I look forward to hearing from someone!

Many Thanks

Stuart Hellier


Which probes for 485?

r_brothers <brothers25@...>
 

New member of group - if this is in archives, I can't find it...

What probes work best with 485?
P6106 and ???

Thanks,

Randy


453 question

grantfair2001
 

I've had a 453 I bought surplus (formerly owned by IBM) a few years
ago. Recently the fan bearings started protesting. About 5 minutes
later the trace disappeared.

I understand the HV winding in the 453 frequently shorts out. Can
someone advise where I can check this? The low voltage board TP's are
are all fine.

I tried to post this yesterday, but it seems to have gone into
cyber-yahoo-space.

I look forward to your comments.

Grant


Re: 7603 Questions

cinerama84106
 

Craig, Yes, you are right!!!
--- Craig Sawyers <c.sawyers@tech-enterprise.com>
wrote:
I picked up a nice 7603A today and overall its a
darn impressive
scope. I was wondering if anyone could fill me in
on the use of
storage scopes
Er - a 7603 is not a storage scope. Are you sure
you don't mean a 7623A,
which is the storage version?

Craig


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Re: 7603 Questions

Craig Sawyers <c.sawyers@...>
 

I picked up a nice 7603A today and overall its a darn impressive
scope. I was wondering if anyone could fill me in on the use of
storage scopes
Er - a 7603 is not a storage scope. Are you sure you don't mean a 7623A,
which is the storage version?

Craig


7603 Questions

cinerama84106
 

I picked up a nice 7603A today and overall its a darn impressive
scope. I was wondering if anyone could fill me in on the use of
storage scopes and the do's and dont's of them. Is it possible to
damage the CRT if used improperly? Any other pointers would be
appreciated.
All this scope needs is a good cleanup, its in excellent shape
overall. The only thing I may do is re-cap the power supply just to
prevent future problems there.
Mark Gulbrandsen
Salt Lake City, UT


Tek 7L14 Help

pedro042
 

I've got a 7L14 that needs a bit of assitance. I've had it for a
while and haven't quite had the time to have a look at it. I need to
find out where some of the internal connectors go and which way they
plug in. A lot of the connectors were unplugged when I got it. I also
have a 7623A (CRT not working) and a 7603 (nothing at all) if anyone
could help it would be much appreciated.

Thanks,
Dave

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