I'll order one and give it a try.
Bob.
toggle quoted message
Show quoted text
On 10/3/2018 11:02 PM, Michael A. Terrell wrote: This may need a special USB 'Y' power cable to get enough current to operate. I had to buy them for some external hard drives, and a DVD burner.
Dual-two-A-type-USB2-0-Male-to-Mini-5-Pin-male-Y-Cable-for-Hard-Disk-Drive-Case/
Michael A. Terrell
-----Original Message-----
From: "bobh@..." <bobh@...>
re: the CPU
I meant to followup on that but just forgot.? I'll have to open it up
again or see if I can tell from the photo a model number. There is a
large an Altera chip and Altera was bought out by Intel in 2015.? Don't
know if their chips still carry the Altera name.
Ok, from looking at the photo I think the Altera chip is a Cyclone IV
which apparently is a FPGA.? Ill look at some other chips too.
I appreciate everybody's ideas and encouragement on following up on this
thing.? No plans to sell it or anything it's too nice to have a Tek
prototype you can carry in your shirt pocket even if it is basically a
paper weight.
|
I use one of these and love it for close work:
Carson Optical Pro Series MagniVisor Deluxe Head-Worn LED Lighted Magnifier with 4 Different Lenses (1.5x, 2x, 2.5x, 3x) (CP-60)
Regards,
Dennis
|
Re: Tektronix 2467B good buy?
Just a quick word of caution. The A5 board is a multi-layer board and there are interlayer conductors to the pins of the NVRAM. You really want to use good desoldering equipment and techniques when removint the old package. Also, you will want to use a quality, very low profile, machined pin socket for the new part.
Good luck,
Tom
toggle quoted message
Show quoted text
----- Original Message ----- From: "jmtfungus via Groups.Io" <jmtfungus@...> To: < [email protected]> Sent: Thursday, October 04, 2018 3:50 AM Subject: Re: [TekScopes] Tektronix 2467B good buy? Dear Menahem, Sergey, Harvey, Chuck and others, thanks for your advice, I did end up buying it as a refurb seems within my ability. Fortunately I do have a desolder station and can replace the chip myself. Any advice on how to read the calibration data off the chip and program the new one? How to solder in a socket? I did once make an eprom reader to retrieve the password off an old IBM Thinkpad laptop so I may be able to do it. Also I assume the PSU caps may have to be discharged? I have downloaded the service manual and the US Army calibration manual so I can check but any tips are valuable. thanks again Jude
|
I have a scope that fails 04 my need calibration and can't I find the 2445B NVRAM in files section can someone point me in the correct direction?
Joe
|
I need the nameplate above the crt on the front panel. Anybody have one laying around?
Thanks!
Marty
KL7AM
|
Re: Tektronix 2467B good buy?
On Thu, Oct 4, 2018 at 05:47 AM, Sergey Kubushyn wrote: 9374L. I've been thinking of buying LC684DXL but it is not a very big
improvement for occasional use. I don't like DSOs and prefer my trusty
beloved 2467B unless I absolutely need some DSO-specific feature. It doesn't
happen often and for logic level signals I have HP 16702B with 10+ different
plugins that beats any DSO by light years in digital domain.
And I don't wanna use those Windoze-driven "instruments" at all. What do you like most in you 2468B (vs 9374L)? I am interesting because i use (and have) many analog and digital oscilloscopes, and 9354L was the fist DSO i liked, mostly because great functionality(mathematics), i can see signal buried in noise using averaging, FFT, inboard CAL out+mathematics = frequency response measurement, statistical measurement etc. Thats why i sold my 2465A at that time. But 9354 have no analog persistence, not great sampling rate and very big dead time compared to analog Tektronix. Now I use as main scope LC684DXL, and it is a big step up comparing to 93xx series, but dead time almost the same. And now i have not only on work, but also in home lab NA and SA and don't need most of 684DXL features. I was thinking to bye 2467B :) but i don't know why do i need it, maybe nostalgie.. Regards, Nazar
|
Hi,
Also have anyone transferred the 2445B NVRAM content into the 2445A SRAM?
There is a 2445B NVRAM file kindly uploaded by Mitchell Kobierowski in this forum. Technically it's possible to upload it into the 2445A SRAM (connect the voltage source via the current limiter while being in the ROM programmer tester and then bring it back to the A5 board). I hope it should fix the FAIL04 prompt and restore the calibration data integrity. Since my 2445a has option 05 (video triggering), I would have to recalibrate it later on together with CAL01, CAL02, CAL03.... but one at a time.
I wonder if doing CAL one at a time is possible at all..
Thank you,
All the Best,
Maxim
|
Hello,
I'm still struggling with 2445A calibration. Good news - I have completely repaired and calibrated TG501. Bad news - I don't have neither the tunnel diode pulser nor the PG506 and I don't really know whether I can do w/o these units.
For the vertical calibration I pretty much only need a some sort of AWG, IMHO. I do possess HP8175A with the option 002 (analog 50 MS/s AWG) which can drive up to 16V into 50 Ohm load.
I assume that the standard amplitude signal required for the 2445a is 1KHz positive polarity (DC coupled) with selectable amplitude.
Yet one more problem to be solved. I had to change the channel 1 hybrid and its from a different scope : 2465a. The seller told me that the hybrid will certainly work after recalibration. However, the trigger AUTO LVL function doesn't find the signal level on the channel 1 (there is a large offset in the auto level measurement). Otherwise the channel 1 works fine.
Does the CAL03 TRIGGERING procedure takes care of AUTO LVL trigger function and adjusts the offset in the ADC algorithm?
If someone could also explain for CAL01 where to overlay the B delay sweep signals (in the center of the screen over the 6th vertical line or anywhere on the screen for all the steps but step 1), this would be awesome.
Thank you,
Best regards,
Maxim
|
I have a couple pair of the cheap loupes. The 3.5X are pretty handy for
general work and I use them quite a bit. I also have a higher power set
but those are not very good since they shake with my pulse which is annoying.
I also bit the bullet and found a Mantis. I use that for serious
work but keep the loupes handy for small jobs.
Paul
toggle quoted message
Show quoted text
On Wed, Oct 03, 2018 at 05:55:21PM -0600, Charles Bacon, Keeper of the Vision, International Vacuum Tube Museum wrote: I think marking distance is the same as focal distance.
And I heartily agree with John. The old OptiVisor does not get near to a good pair of binocular loupes.
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of John Griessen
Sent: Wednesday, October 03, 2018 5:02 PM
To: [email protected]
Subject: Re: [TekScopes] Good loupes
On 10/3/18 5:56 PM, snapdiode via Groups.Io wrote:
I've been using the standard OptiVisor for years, never really feeling it's all that great.
Then I got these What is the term marking distance? 420mm. Is that the distance from the front of the lenses they focus at?
!DSPAM:5bb56f12133411935094068!
--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows
|
Robin,
This may sound gross but I have a near mint 7704A that I bought for less than the value of the 7T11 sampling timebase that came with it. Since it is the only one of my 7000 frames that splits in half it is the only one that can go in the attic for storage. What I was suggesting is a straight swap of my 7603 for your 7623A, that way we both have one in - one out!
Regards,
Roger
|
On Thu, Oct 4, 2018 at 05:00 AM, lop pol wrote:
It has Mostek MK36694J-5 and MK36693J-5 ROMs. Are these something that in
order to do a proper restore need to be replaced?
IIRC the 468 ROM's came in three revisions, -00, -01 & -02, where -00 and -01 were Mostek. The -02 had the same digital content as the -01 but were CY7C264 EPROM's. The Mostek's are unreliable and for that reason ought to be replaced although replacements could be hard to find. With an adapter board common 27C64's could be used. /H?kan
|
Re: vintageTEK museum releases Replaceable Parts Registry (RPR)
Here is a link to the RPR .pdf files:
Michael A. Terrell
toggle quoted message
Show quoted text
-----Original Message----- From: Dave Brown <davebr@...>
Sent: Oct 3, 2018 11:44 PM
To: [email protected]
Subject: Re: [TekScopes] vintageTEK museum releases Replaceable Parts Registry (RPR)
Based on requests we have scanned the 151- transistors and it is now on tekwiki.org. It is 762 pages.
We have been asked about OCRing the document. That would make it searchable but the experiments we have done with OCR on the RPR is there are just too many errors. Wrong part numbers would be worse than no OCR in my opinion. You would still have to find the part number manually to make sure. The part numbers are in numerical order so it is fairly easy to find the page for it. Reverse lookup of part numbers by instruments is more easily done with the service manual for that instrument.
I have the 366 and 311 on my to do list. Note this is about 8 hours of scanning if I counted the RPR cards correctly. It takes just over 2 hours to scan a single RPR card. It is mindless work.
Dave
|
Hi Roger,
A 7603 would be lovely. I have a working ish but in needs attention 7704A with plugins that I¡¯d happily swap for it. I need the space but don¡¯t want to skip anything unless I can absolutely help it. The 7623A is the bottom of the pile and not much use to me so I¡¯d really like it gone.
Cheers
Robin
toggle quoted message
Show quoted text
On 3 Oct 2018, at 11:37, Roger Evans via Groups.Io <very_fuzzy_logic@...> wrote:
Robin,
I live nearby, in Malmesbury, but in all honesty I have more equipment than I reasonably have room for. Having said that, I get more fun from fixing scopes than from looking at them. Would you be interested in a working 7603 or do you just want the space?
Don't let the 7623A go the skip!
Regards,
Roger
|
Re: Tektronix 2467B good buy?
Dear Menahem, Sergey, Harvey, Chuck and others,
thanks for your advice, I did end up buying it as a refurb seems within my ability. Fortunately I do have a desolder station and can replace the chip myself. Any advice on how to read the calibration data off the chip and program the new one? How to solder in a socket? I did once make an eprom reader to retrieve the password off an old IBM Thinkpad laptop so I may be able to do it. Also I assume the PSU caps may have to be discharged? I have downloaded the service manual and the US Army calibration manual so I can check but any tips are valuable.
thanks again Jude
|
Re: vintageTEK museum releases Replaceable Parts Registry (RPR)
Dave - my continued and grateful thanks for the hard work in scanning these unique documents. They are
a superb resource for us in restoring and repairing our Tek gear.
Craig
toggle quoted message
Show quoted text
Based on requests we have scanned the 151- transistors and it is now on tekwiki.org. It is 762
pages.
Dave
|
This may need a special USB 'Y' power cable to get enough current to operate. I had to buy them for some external hard drives, and a DVD burner.
Dual-two-A-type-USB2-0-Male-to-Mini-5-Pin-male-Y-Cable-for-Hard-Disk-Drive-Case/
Michael A. Terrell
toggle quoted message
Show quoted text
-----Original Message----- From: "bobh@..." <bobh@...>
re: the CPU
I meant to followup on that but just forgot.? I'll have to open it up
again or see if I can tell from the photo a model number. There is a
large an Altera chip and Altera was bought out by Intel in 2015.? Don't
know if their chips still carry the Altera name.
Ok, from looking at the photo I think the Altera chip is a Cyclone IV
which apparently is a FPGA.? Ill look at some other chips too.
I appreciate everybody's ideas and encouragement on following up on this
thing.? No plans to sell it or anything it's too nice to have a Tek
prototype you can carry in your shirt pocket even if it is basically a
paper weight.
|
Re: vintageTEK museum releases Replaceable Parts Registry (RPR)
Based on requests we have scanned the 151- transistors and it is now on tekwiki.org. It is 762 pages.
We have been asked about OCRing the document. That would make it searchable but the experiments we have done with OCR on the RPR is there are just too many errors. Wrong part numbers would be worse than no OCR in my opinion. You would still have to find the part number manually to make sure. The part numbers are in numerical order so it is fairly easy to find the page for it. Reverse lookup of part numbers by instruments is more easily done with the service manual for that instrument.
I have the 366 and 311 on my to do list. Note this is about 8 hours of scanning if I counted the RPR cards correctly. It takes just over 2 hours to scan a single RPR card. It is mindless work.
Dave
|
Probably the same as the stuff used to tie old electric motor windings. I think it's just called "lacing cord" and there are a few different varieties. Some are heat shrinkable. I have a spool here floating around somewhere from when I rewound an old 1930's Emerson electric desk fan.
--Eric
Sent from my Samsung Galaxy smartphone.
toggle quoted message
Show quoted text
-------- Original message --------From: John Griessen <john@...> Date: 10/3/18 5:57 PM (GMT-06:00) To: [email protected] Subject: Re: [TekScopes] Cable lacing On 10/3/18 5:48 PM, snapdiode via Groups.Io wrote: Does anyone know what the wiring harness lacing material is inside, say, a 1A4? I don't know, but I have a feeling it is waxed nylon webbing about 3mm wide and less than a .5mm thick. It was a kind of a standard of the 60's 70's even the 80's (in mil contract land).
|
I'm tossing around the thought of restoring a 468. It has Mostek MK36694J-5 and MK36693J-5 ROMs. Are these something that in order to do a proper restore need to be replaced? I had originally planned on using this as a parts scope but for some reason that never works out.
Thanks guys
|
On 10/3/18 8:24 PM, Steve wrote: My eyes have differing vision. One is nearsighted, the other is farsighted. Are those loupes usable under those circumstances? I think they might be good. They have a clear part that is big like safety glasses, so maybe you can fit your prescription lenses in a frame under them.
|
Dennis McCreery
zenith5106
Michael A. Terrell