The 200 series are all fine, but rare to obtain and expensive to ship.

Look at Craig List, and go to local Ham radio flea markets

The straps and foot rails are adjustable to fit most Tek portable, we used 475B, 465, and 246xB on these carts.

Jon

Thank you for your help, Ozan,
I have posted a picture of the signals at Q310 base & collector and Q310 base & emitter on the photo album?/g/TekScopes2/album?id=279289.
The base signal really follows the emitter, but the voltage difference seems to be 7.5V rather than 0.75V.
This time I am using two tek probes.
Am I reading the voltage difference with the cursors wrong?
If not, what may be causing this?

Hi Stefan,

Look at the photo directory, I've added a screenshot of the older schematic along with photos.
For my restauration, I'll eventually have to buy the SN B040000 manual from Artek Media, but right now I only have access to older one from tekwiki.

The newer version has green PCB and missing components. So my guess the PCB is basically the same, minus the components of course.
Note that A20 board (focus & intensity) has already 4 revisions? (part 670-5369-0[0-3]) for the older version. It would be interesting to look at the part number of the newer version.

Also, may be they use a different tube (V500), on the older one, this is part 154-0812-00.

Best regards,

On Sun, Oct 23, 2022 at 01:34 PM, Rogerio O wrote:

Hi folks,
Following Ozan's suggestion I have measured pin7 in on CH1 and pins 5 and 6 on CH2 and everything went as expected. 0V at pins 5 and 6 while having the staircase signal at pin 7.
Then I decided to replace Q310 with an originial tek 151-0192-00 that is used in the later models.
Since the problem was still there I measured the signals at the collector of Q310 (TP305) and its emitter (left side of R310) and, to my surprise the signal was "saturating" there.
I posted a picture of the signals st the photo album?/g/TekScopes2/album?id=279289.??
PLEASE NOTE THAT THE PROBE ON CH2 IS NON TEK SO THE REAL V/Div READING IS 2V/DIV!!!
So I checked the DC bias at Q310??base (using the settings of table 7-2)? and the mesured +0.6V as shown in schematics.
I made a "crude verification of signal loading" by measuring the resistance to ground of U350B pin 6? (13.4K) and pin7 (5K), but I don't know if these value may cause (or explain) the problem.
Any other suggestion?
Thanks
?

———-

Hi Roger,
In normal operation base of Q310 should move with ramp. Schematic shows DC value in a specific condition, which is a great debug help, but may not tell the whole story.?

?

S429 (PULSED mode) switch should be pulling cathode of CR234 to ground in normal mode, which should pull base of Q234 below turn on voltage (Vbe below 0.5V). With Q234 off R234 should pull base of Q320 high. Base of Q310 should follow the ramp with a 0.7V offset.?

?

If you pull out Q234 do you see all the steps? If it works possible failure modes in the order of probability: dirty PULSED switch, open CR234, open or drifted R237, bad Q234, drifted R234.?

?

Since you already replaced Q310 we can assume it is good.?

Ozan

Hi Stefan,

I've actually both a SN B040000 and up newer version, and an older one.
They're both non-working and restauration projects.
However, I've taken a quick look already, and if I remember correctly, the PCB are actually same.
But with the enhance/integrate switch/potentiometer combo not installed (holes are there!).?Otherwise components seem same.
I can have closer look if you want.

BTW, do you have the newer version's manual? Tekwiki only has the older one.

Best regards,

开云体育

IF Q310 is used as a current amplifier (low impedance input) then the base voltage can be 0.6 volts even if the operating conditions are bad.? Is the base connected to multiple sources through resistors?? If so, it is likely a current amplifier.? Please check the voltages and signals at the other end of such resistors.? Check the voltage drops across the collector and emitter resistors to see if they are correct, likewise, too low a collector voltage supply can cause saturation.? Try these tests with no steps generated (if possible) to see the DC operating points.

Harvey

Hi folks,
Following Ozan's suggestion I have measured pin7 in on CH1 and pins 5 and 6 on CH2 and everything went as expected. 0V at pins 5 and 6 while having the staircase signal at pin 7.
Then I decided to replace Q310 with an originial tek 151-0192-00 that is used in the later models.
Since the problem was still there I measured the signals at the collector of Q310 (TP305) and its emitter (left side of R310) and, to my surprise the signal was "saturating" there.
I posted a picture of the signals st the photo album?/g/TekScopes2/album?id=279289.??
PLEASE NOTE THAT THE PROBE ON CH2 IS NON TEK SO THE REAL V/Div READING IS 2V/DIV!!!
So I checked the DC bias at Q310??base (using the settings of table 7-2)? and the mesured +0.6V as shown in schematics.
I made a "crude verification of signal loading" by measuring the resistance to ground of U350B pin 6? (13.4K) and pin7 (5K), but I don't know if these value may cause (or explain) the problem.
Any other suggestion?
Thanks
?

I've managed to source the info I need, special thanks to the member who opened up their unit! :)

Hi all,

I am currently looking for copies or scans of the Instrument Interfacing Guide (part no. 070-6759-00) and the Reference Guide (part no. 070-6761-00) for the AFG5101 arbitrary function generator.

These seem to be a bit rare, so the usual suppliers (Artek etc) don't seem to have them...

Anyone got a copy of these they can send/sell to me by chance?

Thanks!
Jared

Bonjour chère Jennifer,

We have met before..am sure you knew our friends in audio....and Tek...

Sid S. Dick S. (RIP),
Rich C, Bruce H
Tomlinson H
Sol Marantz

Bravo for the Tektronix collection! Fine selection.

See the other Tekscope at groups.io ( omit the 2) as they do not overlap, also Tekwiki and EEVBLOG.

Bon Soirée

Jon

开云体育

Jennifer- Welcome aboard......
and here I thought I had too many...space is the limiting factor.....I am not a collector either but grew up using mostly Tek scopes.
Great bunch of folks here.
搁别苍é别

On 10/22/22 02:10, Jennifer Crock via groups.io wrote:

Here is a partial list of my lab:

I like the 7844 and 7104 also. Welcome to a place to ask questions about repair, use of probes, measurement setups, whatever.

I have spare scopes untested also. I am not a collector either. I only use tektronix scopes for very serious applications --
never because they can be sort of beautiful. I also try to spend more time measuring with them than repairing or polishing.

Not a collector.

:-)

--
John Griessen -- building lab gear for biologists
Albuquerque NM blog.kitmatic.com

7104 opt 2 & 3 1 Gig
7A29 1 GHz 50ohm single
7A19 600MHz 50ohm single
7B10 1 GHz 200mS to 2 nS x10=200pS
7B15 1 GHz Delaying " " "

R7844Dual Beam 400MHz scope
7A24 2 ch 400MHz
7A16A single 150MHz
7B92A 500MHz time base
7B92A 500MHz time base

Greetings.
I work in the audio industry and had my teen years in the back yard of Tektronix , so naturally gravitated to using Tek gear. I am not a collector, just a user,... I use my Tek stuff in a real working environment. Here is a partial list of my lab:
Jennifer

<7000>
7104 opt 2 & 3 1 Gig
7A29 1 GHz 50ohm single
7A19 600MHz 50ohm single
7B10 1 GHz 200mS to 2 nS x10=200pS
7B15 1 GHz Delaying " " "

R7844Dual Beam 400MHz scope
7A24 2 ch 400MHz
7A16A single 150MHz
7B92A 500MHz time base
7B92A 500MHz time base

7834 400 MHz Storage scope
7A16 single 150MHz
7A18 2 ch 75MHz 1meg
7B92A 500MHz time base
7B92A 500MHz time base

Untested, no plug-ins installed
7704A / P7001 digitizer scope

Extra 7000 series items
7A13 Diff Comparator 100MHz
7A13 Diff Comparator 100MHz
7A13 Diff Comparator 100MHz
7A17 150MHz high gain
7A18 2 ch 75MHz 1meg
7B53N 100MHz time base
7B92 500MHz time base
7D10 event count to trigger
7D11 delay time to trigger
7D14 freq counter

Other series
2247A 100MHz Portable
576 Curve Tracer
576 Curve Tracer
575 Curve Tracer
535 10MHz Scope

Also use a pretty good collection of TM500 and 5000 items including Bruce Hoffer's audio masterpieces, the AA501A and SG505 with IMD and balanced out options.

<TM 500 & 5000>
TM5000 w/rack ears
TM5000 w/rack ears
TM506 rack
TM506 rack
TM506 rack
TM506 rack
TM515 suitcase
TM501
TM501
TM503
TM504
TM504
AA501 Distortion test
AA501A Distortion test
AM503 current probe set
with A6302 Current probe
DM501 4.5 digit DMM
DM501A 4.5 digit DMM
DM501A 4.5 digit DMM
DM501A 4.5 digit DMM
DM501A 4.5 digit DMM
DM501A 4.5 digit DMM
SG502 5Hz 500KHz
SG502 5Hz 500KHz
SG502 5Hz 500KHz
SG503 leveled sine 250MHz
SG505 opt 2, balanced out, IMD
FG504 sweep gen 40MHzl
FG507 sweep gen .002 to 2MHz
PG502 pulse 10Hz to 250MHz
PG505 pulse 1Hz to 100KHz
TG501 time base gen
DC503A counter
DC505A counter
PS503A dual power supply
PS501-1
PS lab-built dual supply
SC504 40 meg scope
PS5010 power supply
PS5010 power supply
DM5010 multi meter
DM5010 multi meter
FG5010 20meg function
FG5010 20meg function
2 ) probe tool case plug in
5 ) slot covers

Guess I should have remembered to look there first...

As a last resort, you may need to look at the schematics from some other signal generators of that era and look for the same looking pin-out device. See if there is a part number for that. Transistors might just be general purpose, and crystal footprint generic so should not stop the design of a board, like the ICs would. Someone will eventually pop up with the values.
--
T. Gerbic
Central California

One of these turned up and I wonder what the 104F mod is. Anyone?