开云体育

A Google search for "Artek" yields 335,000 results. Therefore, it's not unusual that others use the word. One hit was a foundation formed in the 1930's. As always, it's prudent to be careful about any entity that you do business with via the internet.

On Jan 7, 2025, at 19:25 , William via groups.io <whf@...> wrote:

All supply resistances much much greater than listed in manual - I assume autoranging DMM is driving the semiconductors different than Tek forsaw a half century ago

Pretty sure mine were in the same ballpark, also measured with autoranging DMM. I might be able to check mine after work, if that would help.

- Measured resistances of the tantalums on the rectum fryer board - seem all OK or at the very least not dead shorts.

Did you check the ones on the horizontal amplifier and (I think) the calibrator? I think the -15V tantalums are your most likely culprit for the symptoms given.

Adam

Hi, obviously I did all that before I posted. Did you actually read what I posted? Bill

For better advice Please post photos to the section, as an album inside and front, back

Get the Tektronix service manual, original, Artek copy, or as pdf ( w140, Tekwiki)

Follow the procedures and troubleshooting flow chart

See previous toptics on 7904 power supply load

Search also EEVblog

Bon chance


Jon

Thanks in advance for the excellent help I have received already just by reading.

In an nutshell: 7904 from fleabay advertised as good work but is not - no trace no beam find no sawtooth. Seller very kindly offered me partial refund as seller doesnt want the BA back.

Teardown -> -15V supply at -0.6 V (yes, I know that number ;)) all other supplies that I had the tools to check are within 1%. Pulled power to each board 1 by one -> still -0.6V. Of note, pulling Z axis board power beam unblanked but no sweep or nuthin.

Pulled PS and it is in tik tik mode when disconnected as it should be. It also goes into tik tik mode if no plugins, which I do not think its supposed to do.

All supply resistances much much greater than listed in manual - I assume autoranging DMM is driving the semiconductors different than Tek forsaw a half century ago

-15V transistor fell apart while desoldering from board - not sure if stigmata of overheating or I was just cavemanning it. Replaced and replaced its driver. Still no love.

- Pulled main interface board thinking C60 might be culprit - nope! no short. Ugh now gotta reassemble.

- Measured resistances of the tantalums on the rectum fryer board - seem all OK or at the very least not dead shorts.

- have to get it together to test further. I might be able to borrow a variac. I don't really feel like putting together a fancy dummy load setup just for this one thing (lets all remember I thought I was buying a working scope to use on my OTHER projects) but would be willing to spend a little on some resistors to finish the troubleshooting.

but -17 seems ok and during the burst the - 15 is at about -17. The waveform, though, isnt pretty as shown in the manual - it looks more like the -17 or so is actually the envelope of a much higher freq signal.

The ribbon cable ends are turning to dust in my hands.

Any assistance you might offer in next step troubleshooting, or some minimal load current values to keep it out of burst mode while troubleshooting would be great help.

Thanks in advance!

Bill

Oh. Yes, right. Faulty memory.

DaveD
KC0WJN


On Tue, Jan 7, 2025 at 23:34 John Griessen via groups.io <john=
cibolo.com@groups.io> wrote:

On 1/7/25 20:42, Dave Daniel via groups.io wrote:

ISTR ArTek media was located in Texas

Minnesota..

On 1/7/25 20:42, Dave Daniel via groups.io wrote:

ISTR ArTek media was located in Texas

Minnesota..

I would be interested to know the story behind Artek Distro; I also believe
that it is a legitimate company; I do NOT know if it is related to ArTek
media. ISTR ArTek media was located in Texas before being moved to
Florida; maybe it moved back to Texas? I dunno.

DaveD
KC0WJN


On Tue, Jan 7, 2025 at 19:35 Dave Casey via groups.io <polara413=
gmail.com@groups.io> wrote:

I suspect the "distro" is legit, is run by a list member, and they'll chime
in shortly to explain. But I don't know these as facts, so I'll hold my
tongue so as not to muddy the waters.

Dave Casey
On Tue, Jan 7, 2025, 1:10 PM Dave Daniel via groups.io <kc0wjn=
gmail.com@groups.io> wrote:

ArTek manuals (artekmanuals.com) is located in Florida. Artek Distro
appears to be a completely different vendor and an ebay seller which

sells

lots of random electronic equipment. I personally would continue to buy
manuals from artekmanuals.com, mostly because I personally knew Dave
Henderson, value the quality of and respected his work and honor his
legacy.

DaveD
KC0WJN


On Tue, Jan 7, 2025 at 15:16 Nick via groups.io <tekscopes=
rambler.ru@groups.io> wrote:

I came across an ebay store named "Artek Manuals Distro", selling Artek
CDs and test equipment. Located in McKinney, Texas. Weren't they based

in

Florida before?

Is that a copycat or a legitimate Artek store? And if the former, do

they

have a license to Artek's name and scans?

I suspect the "distro" is legit, is run by a list member, and they'll chime
in shortly to explain. But I don't know these as facts, so I'll hold my
tongue so as not to muddy the waters.

Dave Casey
On Tue, Jan 7, 2025, 1:10 PM Dave Daniel via groups.io <kc0wjn=
gmail.com@groups.io> wrote:

ArTek manuals (artekmanuals.com) is located in Florida. Artek Distro
appears to be a completely different vendor and an ebay seller which sells
lots of random electronic equipment. I personally would continue to buy
manuals from artekmanuals.com, mostly because I personally knew Dave
Henderson, value the quality of and respected his work and honor his
legacy.

DaveD
KC0WJN


On Tue, Jan 7, 2025 at 15:16 Nick via groups.io <tekscopes=
rambler.ru@groups.io> wrote:

I came across an ebay store named "Artek Manuals Distro", selling Artek
CDs and test equipment. Located in McKinney, Texas. Weren't they based in
Florida before?

Is that a copycat or a legitimate Artek store? And if the former, do they
have a license to Artek's name and scans?

ArTek manuals (artekmanuals.com) is located in Florida. Artek Distro
appears to be a completely different vendor and an ebay seller which sells
lots of random electronic equipment. I personally would continue to buy
manuals from artekmanuals.com, mostly because I personally knew Dave
Henderson, value the quality of and respected his work and honor his legacy.

DaveD
KC0WJN


On Tue, Jan 7, 2025 at 15:16 Nick via groups.io <tekscopes=
rambler.ru@groups.io> wrote:

I came across an ebay store named "Artek Manuals Distro", selling Artek
CDs and test equipment. Located in McKinney, Texas. Weren't they based in
Florida before?

Is that a copycat or a legitimate Artek store? And if the former, do they
have a license to Artek's name and scans?

Good day to the group,

I trust everybody has made it well into the New Year.

This is a pre-announcement, if you allow, please.
I am located in Germany as most of you are aware. So this is very likely only interesting for group members located in Germany or the EU.

* I will scale down and I plan to sell most if not all of my inventory of old T&M equipment this year.
* I plan to sell most of my Tektronix 5000 series oscilloscopes, plugins, Tek 7704A and some plug-ins.
* Also, some HP equipment, HP141A mainframe, some plugins, a HP 8443A tracking generator etc.
* And related service and instruction manuals in paper form.
* This will include dozens of Tektronix 5000 plugins incl. type 5A14N, 5A20N, 5A21N, 5A22N, 5A23N amplifiers, the timebases 5B12N, 5B10N, a few 5000 series mainframes, 5440/5441 mainframes and a few 5400 series plugins, and a functional 7704A mainframe with plugins. I intend to provide a complete list by early summer.

* I plan to sell this on the "Test-Equipment-For-Sale-Wanted-or-Exchange.groups.io" - but please feel free to reach out to me if you are already interested in purchasing several components or even the whole lot.
magnustoelle //@// yahoo.com
* I have no false illusions here. I am realistic about the price level of this vintage equipment, so my ask pricing will be low.

* I have had a great time repairing and collecting these items, and I will be forever very graceful that this hobby has allowed me to getting to know great people around the globe.
But it's time to move on for me.

Thanks for bandwidth and kind regards,

Magnus

I came across an ebay store named "Artek Manuals Distro", selling Artek CDs and test equipment. Located in McKinney, Texas. Weren't they based in Florida before?

Is that a copycat or a legitimate Artek store? And if the former, do they have a license to Artek's name and scans?

Hi Evan,

No need to open up your scope. From other group members, I have received additional information. The driver circuit of the line transformer is very close to the one used in the 11401/11402. This shows that the diode is a fast switching Si diode (600V, 3A). In the coming days I will replace the diode and hopefully this solves the problem.

Kind regards,
Gerard

Hi Gerard,

Since you have the 11403A do you need me to open one of mine up to
take photos and try to ID parts?

-Evan

On Mon, Jan 6, 2025 at 1:42?PM gjm45janssen via groups.io
<g.j.m.janssen@...> wrote:

Hi Evan,

Thanks for replying. The CSA803A has a color display. I have put some pictures of the A8 video driver board in the photo album under:
/g/TekScopes/photo/299921/3873248?p=Created%2C%2C%2C20%2C2%2C0%2C0

I realized that my 11403A has the same A8 video driver board. Fortunately, I could make a picture of this diode without removing the board (Pic4 in the album). It is a glass diode with thick wires and a white ring at the kathode and partial identification "H-7".

Kind regards,
Gerard

Oh, no smell of ozone either Jon. The trafo runs at 51 degrees, the caps at 31, this relative to a room temp of 20C, all limited by DIY equipment...

Jon, Ed, Mark and everyone else, thank you so much! I had to go to work today, an "occupational hazard".
Tonight I clarified a couple of things. The neon stays on for a good 30 seconds, but I need a dark place to see it in, so my bad that I didn't see it before, apologies. Second, the noise comes from the middle of the PSU. I'd love to say from the trafo or the caps but it's too tight in there to tell, definitely in there. Sounds like both ends of the unit. Sorry for the lack of certainty. Voltages say tight, the ripple is of variable frequency across voltages if that matters, this with a vertical and horizontal unit inserted. There are snaps, crackles, and pops from the hv cable when wiggled so this needs further cleaning as well, but it sounds different.

Hi Wolfgang,

I understand. I plan to pursue those relays on my own but just wanted to ask just in case.

I'm still interested in getting a few of your boards as I have two 7A13s and I think the 7A12 also uses some of those types as well.

Thanks again,
Barry - N4BUQ

On Sun, Jan 5, 2025 at 05:23 PM, John Williams wrote:

If you don’t have one you need one!

I don't think I have one.
I don't think I need one.
Is this a "collector's passion" ... or am I missing something?

--
Roy Thistle

Over the years I have heard that the meter scales on certain HP gear were custom ruled as part of initial calibration, so specific to the individual instrument, but I have no idea of which ones are this way. I don't know if any Tek ones are, but I doubt it. If anyone gets to a point where they need to take a meter apart for repair, it's a good idea to take an accurate picture or flatbed scan of the face just in case, for future reference and use.

Ed