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WOW did I miss the mark.

First I thought I was replying to the HP group.

Second I see where my website suggestion seems to have disappeared in a huge string of “stuff’.

So, regardless if your interest is HP, TEK or actually numerous other subjects it is worth visiting archive dot org.

Ken

Greetings,

I am only catching part of this conversation but allow me to suggest: www.archieve.org<>

Applying the search term "Hewlett Packard" brings up an enormous amount of material.

BTW, applying the search term "Tektronix" also delivers amazing results.

Regards,

Ken

Gary,

About 6-7 years ago I found these application notes, or most of them, online. Some are definitive tutorials and give procedures directly applicable to the J16 and its many probes. Pg 7 of the 1981 revision of the instruction manual provides the titles of the application notes. As I recall, I found them in an obscure website and am hunting around for them. Will post links with what I find.

Ron

From easy to difficult:

Almost all timebase calibration can be done with a 10 MHz function or
signal generator and frequency counter. The fastest sweeps with
magnification require a 100 MHz or faster source for linearity
adjustment but this is seldom needed.

Vertical calibration can be done with a function generator, AC
voltmeter, and some attenuators but a calibration generator like a
PG506 makes it much faster.

Transient response calibration requires a fast reference level pulse
generator. The PG506 fulfills this function up to at least 100 MHz
but 350 MHz and higher require a faster generator like the tunnel
diode pulser Tektronix recommends. Leo sells one which is suitable
and more than fast enough:



I have an SG503 for generating a leveled sine wave up to 250 MHz but I
have not required it for an oscilloscope calibration yet. The SG504
does not cover low frequencies so both are needed for a full range.

On Sat, 03 Mar 2018 16:46:32 -0800, you wrote:

Hi,

Those of you who were following my "7603 working ... then blank" Thread will know that the problem was a shorted C492 Tanatalum cap on the Vertical Amp board.

To replace this cap, I could simply clip the leads and 'tack' on a replacement ..... or completely remove the old cap leads and properly solder in a new cap. The latter is my preferred solution .... but when I removed the Vertical Amp board (3 screws), the heatsink (aluminum plate) at the rear appears to be held to the circuit board by U450 .... thus restricting access to un-solder the caps leads from the back of the Vert. Amp. board. I did try to un-solder the cap from the top of the board, but not having worked on a Tektronix circuit board before, I was very reluctant to apply too much heat ... :)

The back of the board connects to the vertical CRT deflection pins.
The little collet sockets pull straight off of the pins but you still
have to be very careful.

U450 includes a threaded base (as per photo in Service Manual) .... and I am unsure as to how to remove it ... or whether I should even try .... :) ..... please advise any ideas?????????

Cheers,
Ian

I would probably just clip the leads as you suggested and solder the
new capacitor on from the top of the board instead of messing with it
and risking damage if you are not familiar with removal and assembly.
I have not actually done this on my 7603 but I have on my 78xx
mainframes.

On Fri, 2 Mar 2018 18:48:31 -0300, you wrote:

...

2. It came with 2 7B53As (the additional one with option 5, in the right
vertical slot... Maybe good to uh... Raster!?). This second one is not
functional at all.

Two timebases can indeed generate a raster in these mainframes. A
raster is also useful for verifying the condition of the CRT phosphor.

3. The vertical plugin (7A26) seems to be working fairly... But any
waveform greater than 4 div are clipped... I`m not sure if the mainframe
gain may be very low (or set such), so requiring the plugin's gain to be
increased beyond its dynamic range.
I don't think it's a problem of the vertical amplifier itself, as the
readout is showing well, close to the CRT's edges.

A 7B53A can also be used as a calibrated vertical amplifier in XY
mode.

The clipping does sound like a problem with the 7A26 but try testing
it in the right vertical slot also.

4. The "working" 7B53A is acting weird... It's sweeping backwards (from
right to left :-) quite funny) and in x1 magnification, it only fills about
3.5 divisions... Only with X10 engaged I can see a trace that crosses the
entire screen...
Nevertheless, at x10, it seems the scan is fairly linear...(well, at x1
too, but rather compressed).

I had a 7B92A which did this because the delayed timebase cam had
separated from the ends. Aligning it and gluing it to the ends with
plastic welding compound fixed it.

Luckily you have two 7B53As so between the two you may have a complete
set of replacement mechanical parts for any which are broken and the
second one can serve as a model for reassembling the other.

I can also see some upward bump of about 0.1div on the left end of the
trace (remember that the left end is actually where the end of the sweep
is) and a downward bump (of about the same 0.1 div) on the right end of the
sweep... I don't know what to think of that... maybe it's related to the
Hor. gain problem... Maybe it's some vertical channel switching artifact
(between the trace and the readout).

It is usual to see some tiny ripples at the beginning of the sweep
which are interference from the trigger but it sounds like you are
seeing something else. Check the regulated low voltage power supply
outputs for ripple.

6. The CRT... well that's where I have mixed feelings... For once, it's
definitely brighter than that of my poor 464...and that makes me happy
already, since I couldn't find a replacement for it.
But it also exhibits double peaking and a quite marked change of focus as I
increase the Intensity... But since the 7623A has Auto-Focus amplifier and
DC restorer (which the 464 lacks), there can be some plain electronics
fault at play.

Keep in mind that storage CRTs are not as bright as non-storage CRTs.

I will post some pictures as soon as I can take.

Do any of the above behaviors / defects ring your bells? Any First thoughts
are welcome!

One of the slower single trace vertical amplifiers like the 7B15A or
7B16A would be convenient for diagnostics and in place of a
standardizer. The single trace amplifiers are simpler inside
providing easier access to the interface signals than the dual trace
amplifiers.

Great, thanks!! Now after replacing 80% of the resistors, I can finally put this thing back together!!

-Brian

Manual error to be sure ...in my manual the parts list say 100 and the schematic says 1K ( base of Q366) ..my money is on 1K being correct. At 100 ohms I am guessing would pull the base voltage to low and Q366 would be turned off all the time

-DC
manuals@...

--
Dave
Manuals@...
www.ArtekManuals.com

It is a typo in the parts list. On the schematic it is 1k. The part number is for a 1k (315-0102-00 is a 1k).



Regards.

I'm replacing out-of-tolerance resistors in my 2901 time mark gen and ran across a 1k resistor where the SM says it should be 100R. The resistor in question is R364 on the divider board directly behind Q347. This isn't a model number dependent resistor, but my SN is B041433.

Does anyone have a 2901 they can pop the top on and have a look?

Thanks,
Brian

Hello,

May or may not be a fit for your application or budget, but I saw this on page 69 of the March 2018 RSGB magazine:

Micsig DP10013 100 MHz high voltage differential probe, about GBP150

Also found on amazon.com for about $170



I do not have one, and have no affiliation with that company (I just subscribe to RSGB).

Hope that it helps.

Scott

Hi,

Those of you who were following my "7603 working ... then blank" Thread will know that the problem was a shorted C492 Tanatalum cap on the Vertical Amp board.

To replace this cap, I could simply clip the leads and 'tack' on a replacement ..... or completely remove the old cap leads and properly solder in a new cap. The latter is my preferred solution .... but when I removed the Vertical Amp board (3 screws), the heatsink (aluminum plate) at the rear appears to be held to the circuit board by U450 .... thus restricting access to un-solder the caps leads from the back of the Vert. Amp. board. I did try to un-solder the cap from the top of the board, but not having worked on a Tektronix circuit board before, I was very reluctant to apply too much heat ... :)

U450 includes a threaded base (as per photo in Service Manual) .... and I am unsure as to how to remove it ... or whether I should even try .... :) ..... please advise any ideas?????????

Cheers,
Ian

On Sat, 03 Mar 2018 13:46:20 -0800, you wrote:

OT:

Although not all that one might want for calibrating scopes, a good start would be a reasonably good Rf signal generator, not necessarily PG or SG modules ...

Some sellers on eBay appear to consistently have "tested" (synthesized) Rf signal generators that go up to 1 or 2 GHz,
at reasonable prices. They often show photos on a spectrum analyzer of their RF signal generator in operation, as proof ...

If the SG is leveled, then it can check frequency response. There are
several 7000 series plugins (not 7xxx) that can do this, with
differing frequency responses.

That ought to allow you to use an unleveled SG to check -3db response.

However, you'd still need the TG 501 to check the time base, and the
PG506 to check amplitude.

In addition, the PG506 has some sub 1 ns rise time pulses that can be
useful in checking scope rise times.

Harvey

For example { although there are many others } : EDIinc


Likely a better place to start than a vendor who shows no such photos...

Hi guys,

It would be better if you expressed interest via private email rather than
on the list. I subscribe in digest form so direct emails make it easier
for me to keep track of who expresses interest in what by order of
response. I've got takers for everything, but preference still goes to
someone who wants the whole lot for the simple reason that it simplifies
shipping on my end.

Thanks.

On Sat, 3 Mar 2018, machineguy59 via Groups.Io wrote:

Thanks for the answer.? That is what I expected but needed and expert
opinion.? I don't mind the problem with the A5 ROM because it will
probably need replacement anyway for battery problems.? Seems my biggest
problem will be to calibrate the result.

A5 ROM has nothing to do with calibration -- that is stored in NVRAM -- but
it adds those higher sweep rates that 2445B doesn't have i.e. it changes the
scope identity. It is no biggie -- you simply erase old EPROMs and
re-program them with 2465B firmware.

You will have to re-calibrate it even if existing 2445B NVRAM still held the
calibration constants -- your A1 board will be diffrent and it has a lot of
trimpots/inductors/capacitors to play with while calibrating the assembled
instrument. There is absolutely no chance its setup would match whatever is
still in NVRAM.

On Saturday, March 3, 2018 03:03:37 PM CST, Sergey Kubushyn <ksi@...> wrote:

On Sat, 3 Mar 2018, machineguy59 via Groups.Io wrote:

I have an old A1 board with part number 671-0722-02, with a date of 1987
(design or manufactured?).? I believe this part number is for a 2465B
oscilloscope.? Also, I can obtain a non-working 2445B for a low price.? I
am considering placing this 2465B A1 board in the 2445B chassis, clean it
up, give it a hobbyist calibration.? Will this give me a poor mans 2465B?
What advice can the experts give me before setting out on this mission?

It will give you a full featured 2465B, not a poor man's one. All parts
other than A1 board and front panel label are exactly the same for 2445B and
2465B. Ah, the A5 ROM is different too.

---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group.

File: TG501 schematics.pdf

Uploaded By: Robert Hay

Description:
Schematics stitched together from service manual on TekWiki. If anyone has time to check for any stitching boo boos let me know and i will make corrections.

You can access this file at the URL:
/g/TekScopes/files/TG501%20schematics.pdf

Cheers,
The Groups.io Team

On Sat, 3 Mar 2018, Steve Goldstein wrote:

I would take one SD-24 set and SD-14 Service Reference if they are still
available.

Here are some manuals I saved from the heap over the years. I don't need
them, do you? Strongly prefer local pickup (I'm a bit north of Boston, MA)
but will ship by Media Mail within the US. Preference given to someone who
wants the whole lot.

Here's what I've got:

11801 Programmer Reference Manual, 3-ring binder in slipcase, includes
5-1/4" floppy disc, Aug 1989, 070-7038-01



SD-14 Service Reference, 3-ring binder, Dec 1991 070-8285-00



11401 and 11402 Service Reference, 3-ring binder, Jul 1988 070-6779-02



11801A Service Reference, 3-ring binder, Sep 1991, 070-8024-00



SD-24 Service and Reference Manual, 3-ring binder, Aug 1988, 070-7053-00

with Installation/User Manual, Aug 1988, 070-7052-00

with Functional Test Manual, Oct 1988, 070-7055-00

includes sampling head utility software on 5-1/4" floppy disc



I have two sets of the SD-24 stuff above


Trash day in my locale is Tuesday, and these will be in the trash for the
next pickup if nobody speaks up before then.


Steve

North Reading, MA

---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*

Thanks for the answer.? That is what I expected but needed and expert opinion.? I don't mind the problem with the A5 ROM because it will probably need replacement anyway for battery problems.? Seems my biggest problem will be to calibrate the result.

Here are some manuals I saved from the heap over the years. I don't need
them, do you? Strongly prefer local pickup (I'm a bit north of Boston, MA)
but will ship by Media Mail within the US. Preference given to someone who
wants the whole lot.

Here's what I've got:

11801 Programmer Reference Manual, 3-ring binder in slipcase, includes
5-1/4" floppy disc, Aug 1989, 070-7038-01



SD-14 Service Reference, 3-ring binder, Dec 1991 070-8285-00



11401 and 11402 Service Reference, 3-ring binder, Jul 1988 070-6779-02



11801A Service Reference, 3-ring binder, Sep 1991, 070-8024-00



SD-24 Service and Reference Manual, 3-ring binder, Aug 1988, 070-7053-00

with Installation/User Manual, Aug 1988, 070-7052-00

with Functional Test Manual, Oct 1988, 070-7055-00

includes sampling head utility software on 5-1/4" floppy disc



I have two sets of the SD-24 stuff above


Trash day in my locale is Tuesday, and these will be in the trash for the
next pickup if nobody speaks up before then.


Steve

North Reading, MA

OT:

Although not all that one might want for calibrating scopes, a good start would be a reasonably good Rf signal generator, not necessarily PG or SG modules ...

Some sellers on eBay appear to consistently have "tested" (synthesized) Rf signal generators that go up to 1 or 2 GHz,
at reasonable prices. They often show photos on a spectrum analyzer of their RF signal generator in operation, as proof ...

For example { although there are many others } : EDIinc


Likely a better place to start than a vendor who shows no such photos...