Date   

Re: Tek 465B weird beam on both Channel

 

Hello Fadi,
 
The 465B is a great general purpose scope.
 
Do you have a service manual for your serial number scope? If not, check artekmanuals.com for the correct copy if you can't find a usable free copy.
 
 
After you get a manual, you should open the scope up and check all the low voltage power supplies for voltage and ripple per the manual.
 
That should get you started. You can report your findings back to the group for additional help should you need it.
 
 
Regards,
Tom
 
 

----- Original Message -----
From: fadilx50
Sent: Tuesday, April 16, 2013 11:14 PM
Subject: [TekScopes] Tek 465B weird beam on both Channel

 

Hi All,

I am glad to see this group as active as it is, had been getting lots of
emails on my account after I subscribed, which is great knowing that some of the scopes mentioned are 30 years old!

I need your help figuring out what happened to my 4-day old Tek 465B
that I got untested, sold as is, which was working for the most part and
I could see the calibrated signal perfectly on both channels.

2 days later I powered it up and saw noise on both channels (like they
went bad at the same time) and I can't get any signal to show except for
the strange wave at the beginning of the beam.

I made an animated GIF
http://groups.yahoo.com/group/TekScopes/photos/album/899728043/pic/1272470033/view

which shows what I am talking about.

Any ideas on how to go about fixing this is greatly appreciated.

thanks
Fadi


Re: Planning 2467B LVPS re-cap

Don Black <donald_black@...>
 

Hello Valentin, I'm interested in all your results please, either emailed to me or posted on the web.

Thanks, Don Black.

On 17-Apr-13 8:35 AM, vdonisa wrote:
 

Hello All,

After all was said and done I did some forensics on the old capacitors as seen here:

http://groups.yahoo.com/group/TekScopes/photos/album/1314606778/pic/596556342/view

The conclusions on short:

- all the Chong 100uF/50V capacitors (not only the vented one) were in very poor shape
- the 2 Nichicon VX 47V/25V on the A2 board were not doing very well either
- one of the big blue Spragues was doing worse than the other
- the two Nichicon SE 100uF/35V in the HVPS (A9 board) were not in great shape (this came as a surprise)
- all other caps were "decent" at best except the 4.7u tantalum that was doing really well within datasheet specs.

If anyone thinks it would be interesting I could post the whole list of measurements including fresh capacitors for comparison.

Final conclusion: the re-cap was useful, there were several caps in there on the point of becoming popcorn.

Cheers,
Valentin VE3VDO



Re: Tekscopes magazine issues to give away

sipespresso <sipespresso@...>
 

Spoken for. -Kurt

--- In TekScopes@yahoogroups.com, "sipespresso" <sipespresso@...> wrote:

Also:

jan/feb 1973
tmnotes fall/winter 1985
tmnotes winter 1984
tmnotes fall 1984
tmnotes spring 1985
tmnotes winter 1983
tmnotes spring 1984
tmnotes summer 1984

-Kurt


--- In TekScopes@yahoogroups.com, "sipespresso" <sipespresso@> wrote:

You pay the shipping.

Tekscope sep 1971
Tekscope nov 1971
Tekscope jan 1972
Tekscope march 1972
Tekscope nov 1972
Tekscope v5 no4 july/aug 1973
Tekscope v5 no5 sept/oct 1973
Tekscope v6 no1 jan/feb 1974
Tekscope mar/apr 1974
Tekscope v6 no3 may/june 1974
Tekscope nov/dec 1974
Tekscope v6 no1 mar/apr 1975
Tekscope v7 no2 1975
Tekscope v9 no3 1977
Tekscope v10 no1 1978
Tekscope v10 no2 1978
Tekscope v10 no3 1978
Tekscope v10 no4 1978
Tekscope v11 no2 1979
Tekscope v11 no3 1979
Tekscope v12 no1 1980
Tekscope v12 no2 1980
Tekscope v12 no4 1980
Tekscope march 1981
Tekscope june 1981
Tekscope sept 1981
Tekscope march 1982

New Products july 1972
New Products mar/apr 1975

TM Notes summer 1985


Re: Tekscopes magazine issues to give away

sipespresso <sipespresso@...>
 

Also:

jan/feb 1973
tmnotes fall/winter 1985
tmnotes winter 1984
tmnotes fall 1984
tmnotes spring 1985
tmnotes winter 1983
tmnotes spring 1984
tmnotes summer 1984

-Kurt

--- In TekScopes@yahoogroups.com, "sipespresso" <sipespresso@...> wrote:

You pay the shipping.

Tekscope sep 1971
Tekscope nov 1971
Tekscope jan 1972
Tekscope march 1972
Tekscope nov 1972
Tekscope v5 no4 july/aug 1973
Tekscope v5 no5 sept/oct 1973
Tekscope v6 no1 jan/feb 1974
Tekscope mar/apr 1974
Tekscope v6 no3 may/june 1974
Tekscope nov/dec 1974
Tekscope v6 no1 mar/apr 1975
Tekscope v7 no2 1975
Tekscope v9 no3 1977
Tekscope v10 no1 1978
Tekscope v10 no2 1978
Tekscope v10 no3 1978
Tekscope v10 no4 1978
Tekscope v11 no2 1979
Tekscope v11 no3 1979
Tekscope v12 no1 1980
Tekscope v12 no2 1980
Tekscope v12 no4 1980
Tekscope march 1981
Tekscope june 1981
Tekscope sept 1981
Tekscope march 1982

New Products july 1972
New Products mar/apr 1975

TM Notes summer 1985


Re: Tekscopes magazine issues to give away

Dave Daniel
 

I'll give them a good home. My zip is 80503.

Thanks,
DaveD


On 4/16/2013 9:03 PM, sipespresso wrote:
 

You pay the shipping.

Tekscope sep 1971
Tekscope nov 1971
Tekscope jan 1972
Tekscope march 1972
Tekscope nov 1972
Tekscope v5 no4 july/aug 1973
Tekscope v5 no5 sept/oct 1973
Tekscope v6 no1 jan/feb 1974
Tekscope mar/apr 1974
Tekscope v6 no3 may/june 1974
Tekscope nov/dec 1974
Tekscope v6 no1 mar/apr 1975
Tekscope v7 no2 1975
Tekscope v9 no3 1977
Tekscope v10 no1 1978
Tekscope v10 no2 1978
Tekscope v10 no3 1978
Tekscope v10 no4 1978
Tekscope v11 no2 1979
Tekscope v11 no3 1979
Tekscope v12 no1 1980
Tekscope v12 no2 1980
Tekscope v12 no4 1980
Tekscope march 1981
Tekscope june 1981
Tekscope sept 1981
Tekscope march 1982

New Products july 1972
New Products mar/apr 1975

TM Notes summer 1985



Tek 221 no power

metoorich
 

I pickup up a 221 on ebay, thought it would be fun to try and get it working. The symptoms are no power. I pulled it apart to inspect the batteries. The unit looks pristine, and the batteries are original with no leakage. What the heck, I plugged it up and let it sit for two days. The batteries charged to 12v and I have a reading on the battery meter of half full. If the unit was operating correctly I thought it would have started normally, but it didn't. So I pulled the cover and started checking power supply voltages. I have nothing on any of the test points. The fuse is good. So I'm going through the power supply and checking resistors and caps. The first resistor I checked is R612 coming off the fuse. The service manual calls for a 1.5m. I have a 1.0m installed (brown black green). I ohm'd it and it's definitely a 1.0m. Has anyone had the same experience with their 221?


Tek 465B weird beam on both Channel

fadilx50
 

Hi All,

I am glad to see this group as active as it is, had been getting lots of
emails on my account after I subscribed, which is great knowing that some of the scopes mentioned are 30 years old!

I need your help figuring out what happened to my 4-day old Tek 465B
that I got untested, sold as is, which was working for the most part and
I could see the calibrated signal perfectly on both channels.

2 days later I powered it up and saw noise on both channels (like they
went bad at the same time) and I can't get any signal to show except for
the strange wave at the beginning of the beam.

I made an animated GIF
http://groups.yahoo.com/group/TekScopes/photos/album/899728043/pic/1272470033/view

which shows what I am talking about.

Any ideas on how to go about fixing this is greatly appreciated.

thanks
Fadi


Re: Planning 2467B LVPS re-cap

vdonisa
 

Hi Patrick,

Thank you also for your help during the project.

The 2467B shows some 8200 hours and 3500 power cycles. However I am not sure that all boards are from the same initial scope, i.e. someone might have repaired it with a power supply or other boards salvaged from another scope.

I would like to recap the main board too if possible however my understanding is that it's pretty difficult to remove (without breaking something that is). If you gents will be encouraging and helping me with advice I will try it sometime in the future.

For now my next planned project is replacing the battery and the few caps on the A5 board. I eventually decided to go for the temporary battery pack instead of the bench power supply as I currently have an active construction site across the street and those guys are doing funny things to mains power - just today I had several power glitches strong enough to reset cable box, wi-fi router and all. I don't want to let them ruin my calibration data :-) I will probably get to doing the A5 board this weekend. I'll post photos and report of course.

Thanks,
Valentin VE3VDO

--- In TekScopes@yahoogroups.com, "Patrick Wong" <patwong3@...> wrote:

Hi Valentin,

1. Thanks for posting your measurements.

2. How many hours were logged on the power-on counter?

3. Do you plan to remove the main board to replace the electrolytics there?

Patrick Wong AK6C

--- In TekScopes@yahoogroups.com, "vdonisa" <vdonisa@> wrote:

... Final conclusion: the re-cap was useful, there were several caps in there on the point of becoming popcorn.


Tekscopes magazine issues to give away

sipespresso <sipespresso@...>
 

You pay the shipping.

Tekscope sep 1971
Tekscope nov 1971
Tekscope jan 1972
Tekscope march 1972
Tekscope nov 1972
Tekscope v5 no4 july/aug 1973
Tekscope v5 no5 sept/oct 1973
Tekscope v6 no1 jan/feb 1974
Tekscope mar/apr 1974
Tekscope v6 no3 may/june 1974
Tekscope nov/dec 1974
Tekscope v6 no1 mar/apr 1975
Tekscope v7 no2 1975
Tekscope v9 no3 1977
Tekscope v10 no1 1978
Tekscope v10 no2 1978
Tekscope v10 no3 1978
Tekscope v10 no4 1978
Tekscope v11 no2 1979
Tekscope v11 no3 1979
Tekscope v12 no1 1980
Tekscope v12 no2 1980
Tekscope v12 no4 1980
Tekscope march 1981
Tekscope june 1981
Tekscope sept 1981
Tekscope march 1982

New Products july 1972
New Products mar/apr 1975

TM Notes summer 1985


Re: Brand new unobtainium

lazystrings
 

That is the $99 Question :)

--- In TekScopes@yahoogroups.com, Dave Daniel <kc0wjn@...> wrote:

I had the same question.

On 4/16/2013 2:19 PM, vdonisa wrote:

BTW how would one read the production date code on these hybrid ICs, I
know that the big ones with heatsinks have it printed in clear like
"12 SEP 87", but this one?

Thanks,
Valentin

--- In TekScopes@yahoogroups.com <mailto:TekScopes%40yahoogroups.com>,
"vdonisa" <vdonisa@> wrote:

Must have been genuine, all 4 of them sold right after I posted
here... who's the lucky guy? I wasn't in need of one so I won't bear
you a grudge....

--- In TekScopes@yahoogroups.com
<mailto:TekScopes%40yahoogroups.com>, "vdonisa" <vdonisa@> wrote:

Is this item 171025593025 on e-bay for real or some fake? Can't
believe someone found old new stock of this particular one.


Re: Planning 2467B LVPS re-cap

honolulusnowwhite
 

Hi Valentin,

1. Thanks for posting your measurements.

2. How many hours were logged on the power-on counter?

3. Do you plan to remove the main board to replace the electrolytics there?

Patrick Wong AK6C

--- In TekScopes@yahoogroups.com, "vdonisa" <vdonisa@...> wrote:

... Final conclusion: the re-cap was useful, there were several caps in there on the point of becoming popcorn.


Re: Planning 2467B LVPS re-cap

vdonisa
 

I've added photos here:

http://groups.yahoo.com/group/TekScopes/photos/album/1016612934/pic/430266705/view 

also I found a new Y2 10nF in my stock, it measures 10.47nF 0.006DF.

Cheers,
Valentin VE3VDO


--- In TekScopes@..., "vdonisa" wrote:
>
> --- In TekScopes@..., David davidwhess@ wrote:
> >
> > [...] but I get a nice CRT tan from watching the
> > 6U5 eye tube. [...]
>
> LOL I bet it's more entertaining too than a plain LCD screen....
>
> Anyway I went back to measure some X2/Y2 that I've recently replaced, just to see if I remembered correctly their behavior when aging.
>
> measurements at 100Hz done with same agilent LCR meter.
>
> X2 caps, 68nF nominal:
>
> 66.02nF 0.006 DF - fresh new Kemet
>
> 81.3nF 0.009 - extracted from 2235A
>
> 76.02nF 0.009 - extracted from 2467B
> 76.47nF 0.009 - same scope as above
>
> Y2 caps, 10nF nominal:
>
> 13.08nF 0.011 - from the 2467B
>
> Y2 caps, 2.2nF nominal:
>
> 2.62nF 0.014 - from the 2467B
> 2.85nF 0.015 - same 2467B
>
> 2.996nF 0.036 - from the 2235A
> 3.241nF 0.049 - same 2235A
>
> the 2.2nF ones from the 2235A were also the most cracked of the lot and also slightly bulged on the lateral long sides. Based on the visual aspect and the readings I believe these ones were the most worn out.
>
> Cheers,
> Valentin VE3VDO
>


Tektronix 519 1 Ghz Oscilloscopes

altairjump
 

Hi,
I'm looking for a vintage Tektronix 519 scopes and parts. If any one has one of these please let me know.

Thanks


Re: 475A and de-solder station

 

Kester 1544 which is fully activated liquid rosin flux is my favorite
but they no longer sell it in 4 ounce bottles.

There are lots of fine alternatives though.

On Tue, 16 Apr 2013 23:05:57 -0000, "Robert"
<go_boating_fast@yahoo.com> wrote:

What brand/kind of liquid flux would you recommend?
Bob

--- In TekScopes@yahoogroups.com, "Greg" <gregory.beat@...> wrote:

Liquid Flux is almost mandatory for de-soldering on RoHS compliant PCB,
Many of the RoHS solder alloys have low flux content (dry).


Re: Planning 2467B LVPS re-cap

Tom Jobe <tomjobe@...>
 

Hi Valentin,
The 68 nF X2 caps measured 70 nF on the new ones, and around 85 nF on the old ones, which does not seem so bad, but I'm glad I changed them anyway!
tom jobe...
 
 
 

----- Original Message -----
From: vdonisa
Sent: Tuesday, April 16, 2013 5:01 PM
Subject: [TekScopes] Re: Planning 2467B LVPS re-cap

 

Hi Tom,

The Fluke may be right, I noticed that those old X2/Y2 tend to read much
higher than the nominal value, and that was measured both with a DMM and
a LCR meter, for example 3 samples of old cracked 68nF are reading
between 78 and 86 nF. New fresh ones are reading close to nominal. So
maybe their aging mechanism produces an increase in capacitance or
something like that....

Cheers,
Valentin VE3VDO

--- In TekScopes@..., "Tom Jobe" wrote:
>
> Thanks Valentin,
> After seeing the picture you posted to the Tekscopes Photo section, I
went looking for information on your nice looking Agilent U1733C LCR
meter. That is a fine piece of test equipment!
> Recently while changing the capacitors on these 2235A's, I was taking
capacitance readings on the old and new caps with a Fluke 179 DMM. The
Fluke is not very accurate on the smaller caps, for example the 2200 pF
Y2 caps read 3 nF on the new ones and 10 nF on the old ones.
> I thank you and some other folks on the Tekscopes group for teaching
me that the X2 an Y2 line input caps need replacing too.
> I just may have to think about buying one of those nice U1733C's.
> tom jobe...
>
>
>
>
>
> ----- Original Message -----
> From: vdonisa
> To: TekScopes@...
> Sent: Tuesday, April 16, 2013 4:16 PM
> Subject: [TekScopes] Re: Planning 2467B LVPS re-cap
>
>
>
> Hi Tom,
>
> Here are the measurements. I find it easier to judge in terms of
dissipation factor than in absolute ESR value, so the list is:
>
> First column Capacity in uF
> Second column Dissipation Factor
> measurements done at 100Hz,
> you can compute ESR in Xcel using the formulas here:
>
> http://en.wikipedia.org/wiki/Dissipation_factor
>
> Chong (nominal 100uF/50V, used during previous "repair"):
>
> 88.9 0.91 (this is the vented sample)
> 95.7 0.068
> 87.4 0.073
> 88.9 0.067
>
> Nichicon PL(M) (nominal 100uF/25V originals from Tek)
>
> 99.32 0.033
> 102.7 0.033
> 101.5 0.038
> 102.8 0.035
>
> (though older then the Chongs they are more consistent and with half
the DF)
>
> Nichicon SE (nominal 100uF/35V extracted from HVPS):
>
> 92.31 0.053 (not great at all)
> 92.66 0.052
>
> Fresh new 100uF for comparison:
>
> Panasonic FR 99.48 0.029
> Nichicon BT 102.7 0.024
>
> Sanyo green 180uF/50V (previous repair):
>
> 174.8 0.035
> 174.5 0.035
>
> Nichicon HV(M) 270u/35V (previous repair):
>
> 285.9 0.034
> 287.0 0.036
> 289.0 0.034
> 285.5 0.033
>
> United Chemicon 10u/160V:
>
> 9.36 0.042
>
> Fresh new Nichicon CA 10u/160V:
>
> 9.35 0.023
>
> United Chemicon 10u/100V:
>
> 10.45 0.039
> 9.83 0.039
> 9.65 0.035
> 9.89 0.036
>
> United Chemicon 3.3u/350V:
>
> 3.56 0.033
>
> Nichicon VX 47u/25V (A2 board):
>
> 42.8 0.098 (rather high!)
> 44.88 0.086
>
> Fresh new 47u/25V for comparison:
>
> Panasonic 47u/25V FR 46.28 0.023
> Nichicon Organic Polymer 47u/25V 47.17 0.013 (just for fun)
>
> Bunch of smaller capacities, some of them are from the
counter/trigger board but I don't remember which is which now:
>
> Nichicon 1u/50V non-polar:
> 1.09 0.072
> 1.1 0.064
> 1.09 0.065
>
> Nichicon VX 4.7u/35V:
>
> 4.22 0.064
> 4.45 0.042
>
> Nichicon VX 10uF/25V:
>
> 10.05 0.049
> 10.38 0.04
> 9.97 0.045
> 10.1 0.041
>
> Tantalum 4.7uF:
>
> 4.68 0.013
>
> Big blue Spragues 290u/200V:
>
> 301 0.033
> 306 0.064
>
> Cheers,
> Valentin VE3VDO
>
> --- In TekScopes@..., "Tom Jobe" tomjobe@ wrote:
> >
> > Hi Valentin,
> > I definitely would like to see your capacitor conclusions.
> > Thank you for offering to let us see your results!
> > tom jobe...
> >
> >
> >
> >
> > ----- Original Message -----
> > From: vdonisa
> > To: TekScopes@...
> > Sent: Tuesday, April 16, 2013 3:35 PM
> > Subject: [TekScopes] Re: Planning 2467B LVPS re-cap
> >
> >
> >
> > Hello All,
> >
> > After all was said and done I did some forensics on the old
capacitors as seen here:
> >
> >
http://groups.yahoo.com/group/TekScopes/photos/album/1314606778/pic/5965\
56342/view

> >
> > The conclusions on short:
> >
> > - all the Chong 100uF/50V capacitors (not only the vented one)
were in very poor shape
> > - the 2 Nichicon VX 47V/25V on the A2 board were not doing very
well either
> > - one of the big blue Spragues was doing worse than the other
> > - the two Nichicon SE 100uF/35V in the HVPS (A9 board) were not in
great shape (this came as a surprise)
> > - all other caps were "decent" at best except the 4.7u tantalum
that was doing really well within datasheet specs.
> >
> > If anyone thinks it would be interesting I could post the whole
list of measurements including fresh capacitors for comparison.
> >
> > Final conclusion: the re-cap was useful, there were several caps
in there on the point of becoming popcorn.
> >
> > Cheers,
> > Valentin VE3VDO
> >
>


Re: Help Tektronix 466 repair advice

epicfatigue
 

Ah fantastic,

Well i have ordered my parts to build a HV prove,

got the following.

http://www.ebay.com.au/itm/380520385001?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649#ht_1954wt_1139

http://www.ebay.com.au/itm/380517156302?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649#ht_1954wt_1139


The internal resistance of my meter is 10M Ohm,

DMM
+
------[ 10G ohm ]----------------------
| |
10M Ohm 10M Ohm
| |
---------------------------------------
-



so 1000V should read 4.975, its not perfect but it should get the job done.


Re: Planning 2467B LVPS re-cap

vdonisa
 

--- In TekScopes@yahoogroups.com, David <davidwhess@...> wrote:

[...] but I get a nice CRT tan from watching the
6U5 eye tube. [...]
LOL I bet it's more entertaining too than a plain LCD screen....

Anyway I went back to measure some X2/Y2 that I've recently replaced, just to see if I remembered correctly their behavior when aging.

measurements at 100Hz done with same agilent LCR meter.

X2 caps, 68nF nominal:

66.02nF 0.006 DF - fresh new Kemet

81.3nF 0.009 - extracted from 2235A

76.02nF 0.009 - extracted from 2467B
76.47nF 0.009 - same scope as above

Y2 caps, 10nF nominal:

13.08nF 0.011 - from the 2467B

Y2 caps, 2.2nF nominal:

2.62nF 0.014 - from the 2467B
2.85nF 0.015 - same 2467B

2.996nF 0.036 - from the 2235A
3.241nF 0.049 - same 2235A

the 2.2nF ones from the 2235A were also the most cracked of the lot and also slightly bulged on the lateral long sides. Based on the visual aspect and the readings I believe these ones were the most worn out.

Cheers,
Valentin VE3VDO


Re: Planning 2467B LVPS re-cap

 

I make the same measurements at 1kHz using my ESI 250DA impedance
bridge with similar results. Of course it takes longer because the
bridge is manually balanced but I get a nice CRT tan from watching the
6U5 eye tube.

On Tue, 16 Apr 2013 23:16:36 -0000, "vdonisa" <vdonisa@yahoo.com>
wrote:

Hi Tom,

Here are the measurements. I find it easier to judge in terms of dissipation factor than in absolute ESR value, so the list is:

First column Capacity in uF
Second column Dissipation Factor
measurements done at 100Hz,
you can compute ESR in Xcel using the formulas here:

http://en.wikipedia.org/wiki/Dissipation_factor

. . .


Re: Help Tektronix 466 repair advice

 

You could but I would fix the reduced scan problem first. The bad
capacitor on the external trigger circuit is not important. The
oscilloscope will work fine without it.

On Wed, 17 Apr 2013 00:28:38 -0000, "epicfatigue"
<epicfatigue@yahoo.com> wrote:

My scope will only show a trace line if i pull reduced scan due to the fault i am having,

will i be able to get a correct read using it this way following the procedure you listed?


Re: Alternate source(s) for Hakko 808 tips? (was: Re: Re: 475A and de-solder station)

John Miles <jmiles@...>
 

Ditto, I just got a new 808 myself, and noticed that the tip oxidized very
rapidly. It was likely a mistake on my part to crank the temperature up
before I even bothered to plug it in and try it. Pro "tip": don't do that.

That being said, wow, this thing is awesome. It makes every other
desoldering iron I've used, including some more-expensive Pace stations,
look like toys. You can actually see the solder being sucked up, rather
than having to imagine it. It works better with an oxidized tip than my
Pace does with a brand new one.

-- john, KE5FX

Hello--

The Hakko 808 works as advertised (and works very well), but
it's essential to periodically replace the white ceramic-fabric filter
and also clean the inside of the solder-collection barrel of flux
and solder film.

My only complaint is the short life of the tips, which seem to
lose the nozzle plating rather quickly and then no longer make
good thermal contact with components' solder pads...

99201 - 99220 of 189967