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As I recall, the reason Tek would not recommend a 7B53 as a timebase for a
7704 is that it will not sweep fast enough to take full advantage of the
7704's 200 MHz bandpass. Other than that, I believe it will work just fine.
An even simpler, and probably cheaper, timebase would be a 7B50 or 7B50A with
does not have the delayed sweep feature. You could even use a 7B51 that is
normally used with a 7B50 to provide delayed sweep but can be used as a simple
timebase without a 7B50. I only suggest the 7B50, 7B50A, and 7B51 because
they might be more available and cheaper than the 7B53/A alternatives. There
was also an earlier version of the 7B53 called the 7B52 which would work as
well . . .

I really need to get on with finishing my second book . . .

Stan
w7ni@...

dd@... wrote:

Hi all, :)

A couple of times recently there have been mentions of people who hold some
stocks of Tek parts for sale for replacements. (e.g. pots, transistors,
tubes etc).

After a recent rebuild (hopefully the last) of this computer, I have
unfortunately lost the message/s containing this information, and I may need
some parts for a friend's 454.

It seems that it might be a nice idea if there was a list of these people or
organisations, either posted semi-regularly to the list, or on a web site
somewhere.

Does this list have a "parent" website? Or is there a list of relevant
sites somewhere? I have unfortunately lost my old "bookmarks" list as well,
but I know that some of the list's contributors have "Tek" sites, which I
have visited...

Can anyone help...?

Thanks in advance for any help, and regards,
:)
Michael

Hi All,

I am looking for two (2) Tektronix 475 Position Pots.

Tektronix Part Number 311-1411-00.

Regards,

Andrew Campbell

Calibration and Repair Network Pty. Limited
A.B.N 64 090 761 363
An ISO9001:2000 Quality Certified Company
Licence No. QCC 716
Bldg. T2A, Nirimba Education Precinct
Eastern Road (P.O. Box 147)
Quakers Hill NSW 2763
Australia
Ph: (02) 9853 3259
Fx: (02) 9853 3258
Email: service@...
Web: www.candrnet.com.au

Seconded - before I acquired 7B87, later -92As via a package deal: a
7B53 in my 7854 (400 MHz nom) scope worked fine. At fastest sweeps,
with a known ~700 pS risetime pulse - yes, you can see some combo of
delay-line (absent or mismatched?) aberrations on trace start; IIRC
maybe an almost double-pulse clearly "not happening".

Yes, that's what I was talking about... I know it's written up in one of
the manuals or catalogs, but I can't seem to locate it at the moment.
I guess I'm just picky :-) On the other hand, 7B8xs are pretty cheap.

(Still.. it's fun to see the readout say, "500 pSec" on the -92s -
and realize it's even true within 3-5% !!

Most of them will give a solid trigger on a 1GHz signal - a tribute to the
power of tunnel diodes.

--- In TekScopes@y..., dhuster@p... wrote:

There's not a darned thing wrong with using a 7B53A in a 7704 or
7704A. It's the 7B92/A that you can't easily use on lower

bandwidth

scopes only because they can't handle the faster sweeps. And

7B53A's

are so plentiful that they should be cheap. Having to come up with
and pay for a pair of 7B7x or 7B8x is a lot more difficult and
expensive -- and you'll need two service manuals instead of one.

And

the 7B53A leaves a horizontal compartment free for a counter or DMM.

Seconded - before I acquired 7B87, later -92As via a package deal: a
7B53 in my 7854 (400 MHz nom) scope worked fine. At fastest sweeps,
with a known ~700 pS risetime pulse - yes, you can see some combo of
delay-line (absent or mismatched?) aberrations on trace start; IIRC
maybe an almost double-pulse clearly "not happening". So all one
needs to remember is: Stay away from <10 nS/DIV - it isn't 'sposed
to be linear down there.. Audio is almost DC. And as Dean observes,
the built-in dual timebase gets you delayed sweep w/o wasting a
compartment.

(Still.. it's fun to see the readout say, "500 pSec" on the -92s -
and realize it's even true within 3-5% !! One gonzo ramp generator,
to use the technical term ;-) Maybe sometime I can steal a 7104 / 7B10
and see: "200 pSec/DIV" !! As Spock might say.. fascinating


Ashton

The pot/switch for the CAL/VAR volts on Ch1 of my 2230
is disfunctional and there is no detent.
Manual says 311-2218-00 Tek part number, but it
describes it as an Allen bradley 10K pot with a
DPST,etc.
Sounds off the shelf but can't be sure until I dive
into it. According to the manual it sounds like a
MAJOR job. Does anyone really no if is a standard POT?

Help appreciated
Vince

__________________________________________________
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There's not a darned thing wrong with using a 7B53A in a 7704 or
7704A. It's the 7B92/A that you can't easily use on lower bandwidth
scopes only because they can't handle the faster sweeps. And 7B53A's
are so plentiful that they should be cheap. Having to come up with
and pay for a pair of 7B7x or 7B8x is a lot more difficult and
expensive -- and you'll need two service manuals instead of one. And
the 7B53A leaves a horizontal compartment free for a counter or DMM.

I have a 7704A mainframe that is in need of repair...

Also I am in need of a horizontal sweep module.

For mostly audio frequencies a 7B53(A) would be the right choice for
the time base plug in.

The 7B53/7B53A is not recommended for use in the 7704/7704A. I don't
remember why, but I think it was a good reason. The original poster needs
to find a 7B70+7B71, 7B80+7B85, or 7B92/7B92A.

--- In TekScopes@y..., "Bob H." <fisher_c_body@y...> wrote:

Good Evening

I have a 7704A mainframe that is in need of repair. I turned it on
this morning after not having been powered up for about 2 years.

The

trace was moving around erratically. Then I heard a sizzling sound
(never a good sound) and immediately turned it off but not before a
whisp of smoke emerged from the bottom of the scope.

I live in the Atlanta metro area and would like to find a company or
individual who is able to repair it.

Also I am in need of a horizontal sweep module. I'm not sure what
model I am looking for. This scope will be primarily used for audio
frequency applications. Any hints or suggestions would be very
helpful.

The modules I have are 2 7A26 and 1 7A16P that is also in need of
repair.

Any help would be greatly appreciated.

Often the Tantals for Supply Decoupling having a short.
The Chokes which are located before them then usualy smoke.
(at least in the last week i have repaired a 7A26 with such a failure)

For mostly audio frequencies a 7B53(A) would be the right choice for
the time base plug in.

Jorgen
dj0ud

Good Evening

I have a 7704A mainframe that is in need of repair. I turned it on
this morning after not having been powered up for about 2 years. The
trace was moving around erratically. Then I heard a sizzling sound
(never a good sound) and immediately turned it off but not before a
whisp of smoke emerged from the bottom of the scope.

I live in the Atlanta metro area and would like to find a company or
individual who is able to repair it.

Also I am in need of a horizontal sweep module. I'm not sure what
model I am looking for. This scope will be primarily used for audio
frequency applications. Any hints or suggestions would be very
helpful.

The modules I have are 2 7A26 and 1 7A16P that is also in need of
repair.

Any help would be greatly appreciated.

Thanks

Bob

Bill, if you don't mind knobs that aren't perfect, I have enough used
ones to set up. They may be cracked, have a soldering iron ding,
have some paint rubbed off, but they're serviceable. When I was on
the bench at Tek, we were always replacing knobs for cosmetic reasons
and I never threw the old ones away.

Dean

Hello,

Would anyone have a vertical output hybrid for a 7844? Tek part 155-0064 I believe... If anyone has a 7844, I can email them the necessary pictorial info where the part is and how to remove it (it's a 5 minute job). Any reasonable price considered!

Thanks,

ZN

--- In TekScopes@y..., Stan or Patricia Griffiths <w7ni@e...> wrote:

Hi George,

The 3C66 interfaces to a wide variety of mechanical transducers.

This allows

display of all kinds of mechanical measurements on the CRT face such

as

vibration, mechanical shock, shaft rotation, etc.

Interesting... thanks! So it's the 2/3 series equivalent of the type Q
strain gauge then, I assume.

George

Hello, if anyone has access to or knows a source for the following
466 parts, I would be grateful:

- (2) A&B trigger level knobs #366-1280-00

- (1) B trigger slope knob #366-1278-00

- (1) vertical position knob #366-0494-00

- (1) extension shaft for vertical position knob #384-0442-00

Thanks in advance.

Bill

What's REALLY bad about leaving the filter out of the 465/475 scopes
is when they're used "IBM" style -- rear on the floor while working
on equipment. That fan "vacuums" up every dust moozie in sight!

Dean

Air filters: don't buy Tek and don't go out of your way to find

the

filter material. Head down to your local Dollar General, Dollar
Mart, Everything-Under-A-Dollar or whatever the name of the store

is

that undersells Wallyworld and buy the GENERIC Scotchbrite-like
scrubbing pads and cut them to fit. Get the non-green ones if you
can, for they tend to be even less abrasive than the green ones

(and

the generic green ones don't hold a candle to the real Scotchbrite
for agressiveness). If you're in a really dusty environment, give
the filter material a quick, light shot of Pam (the spray oil for
kitchen use, generic is fine, of course) and wash and respray the
filter monthly.

the front top of the "can".
PN 378-0044-01 FILTER ELEM,AIR:2.5 X 2.5 X 0.25 Air filter

element.

Hello Dean,

I remember the Filter-Kote (milky water-soluble oil?) days for the
metal filters in the 5xx scopes (!) I've been cutting up the
open-cell foam intended for use as filters for air conditioners - for
the 4xx series. It's usually grey and about right thickness to stay
in place. Really cheap too - maybe $1 for a humongous sheet or 2.
After a few washings, just toss and snip out another. (Seen quite a
few 4xx scopes of late - with the filter left out. Maybe they just
didn't know..)

Just a thot.

Ashton

Hi George,

The 3C66 interfaces to a wide variety of mechanical transducers. This allows
display of all kinds of mechanical measurements on the CRT face such as
vibration, mechanical shock, shaft rotation, etc.

Stan
w7ni@...

George wrote:

What does a 3C66 carrier amplifier do, or what do you use it for?

Thanks!

George

I'm not sure how helpful this is, but the government calibration

manual

for the TU-7 / 1M1 / 067-0521-00 / 067-0521-01 is available online:

That can be some handy information. But be forewarned about U.S.
Army calibration T.O.s (Technical Orders) which the USAF also uses.
I have seen some that leave a lot to be desired. For instance, the
Army calibration guys (only one of two calibration resources on
Okinawa; the other was at Kadena AFB) were contracted to come to the
Hanza USNSGA site for semi-annual calibrations. I noticed that a
Hewlett-Packard 606A HF signal generator that I'd sent out there came
back with one of the bands loaded with harmonics and a non-sinusoidal
output. I showed them the generator and told that that this was a
problem that was taken care of with calibration. Then I saw the T.O.
that they were REQUIRED to use (against regulations to use HP's
service manual for calibration!) and it never even have them adjust
the oscillator frequency or the output amplifier tank -- that's half
of the calibration of a 606A/B! Since I was in Navy calibration
(couldn't legally do the stuff at the time at our site because of
limited standards) I patiently showed the Army techs the manual and
how to calibrate a 606A's RF section. They told me that it was
against regulations for them to use anything but the Army T.O. -- and
then asked me for a copy of the HP 606A calibration procedure so that
it could be done right!

Just saying that you need to be wary that you might not get a
complete procedure with an Army/Air Force T.O. The one noted in this
series of posts appears to be a retyped copy of the Tek procedure.

By the way, the Navy used the manufacturer's procedure first and then
a Navy procedure if the manufacturer's manual wasn't available. The
Navy Calibration stuff at Pomona is available if you have the right
government connections. Danged shame that stuff like that that
should be public domain is not available to the public.

Dean

I'm not sure how helpful this is, but the government calibration manual
for the TU-7 / 1M1 / 067-0521-00 / 067-0521-01 is available online: