Date   

Tek 485 for sale

Stephen Hanselman
 

From looking at some of the other threads I thought i’d Offer up a 485 here before we strip it

Contact me off list at s.hanselman@...

Steve


Re: Defective 465: into the dumpster it goes!

John Clark
 

Sad story, indeed. Let's throw in a happy story, though. I often think back to acquiring my 475 from my late father back in 2015. It was there, in his workshop, in non-working condition. It probably bugged him every day that it didn't work, as he became physically unable to repair it. I really didn't have a use for it and, if anyone recalls, I hardly knew what it was for. I almost tossed it out but something told me not to. I kept it around for a while and almost tossed it out again, but didn't.

Then, one day my computer monitor quit working. I jumped onto YouTube and found a video that described common caps that fail in my particular monitor. I realized I could do that so I swapped them out and I'll be darned if it didn't fix my Dell monitor! I then looked over in the corner at that old 475 sitting there begging for some attention and that's when I found this Group.

You guys helped me get it fixed up and I still enjoy it to this day. It's in excellent condition and I love it! I have little use for it but bought that clock board and turn it on now and then to let it run and watch the clock. Over the last few years I've educated myself about scopes and now even have a Snap-on Vantage Pro (2 ch DSO) that I use for diagnosing cars.

You can't save them all but with the help of those here, especially Raymond in my case, many are saved.

Thanks to all!
John in Charlotte

________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Raymond Domp Frank <hewpatek@...>
Sent: Saturday, August 31, 2019 6:01 PM
To: TekScopes@groups.io <TekScopes@groups.io>
Subject: [TekScopes] Defective 465: into the dumpster it goes!

What follows is a longish and sad story.
A few days ago, I was contacted by someone who said he was looking for a good quality analog 'scope.
Without asking many questions, I showed him one of my 465's and he liked it. He expressed some concern as to the reliability of these very old instruments (I think this sample was from 1976/77). I told him that these old 'scopes were still "more usable than unreliable", that some parts did tend to fail from old age, especially the dipped tantalum caps but that diagnosis and repair was straightforward, that I would take care of repair for some time in the future for free and that I had an ample spare components supply of all sorts should they be needed.
He was going to use the 'scope mainly for adjusting radio receivers and was looking forward to the high vertical sensitivity, especially when using a 1:1 probe. This should have been a warning for me but I limited myself to explaining why the use of passive 1:1 probes cannot be recommended for some of his intended use (450 kHz and 10.7 MHz IF) and giving him an example of the math.
We agreed on a price and he left, happy with his newly acquired classic, or so I thought.
After a few days, he contacted me, asking for two knobs (A and B trigger level), since apparently parts had broken off. I told him that I'd send replacements for free.
Before I could send them, he contacted me, saying that the replacement knobs were no longer needed since the 'scope had broken down: no beam, no graticule illumination, no fan sound, and that he had concluded that his 'scope obviously was a total loss. He was sorry to tell me the bad news but he had very much appreciated my explanations and service and he definitely wouldn't want any money back. When I offered to repair the 'scope for free, he added that that wouldn't be possible, since it was now in an underground dumpster, inaccessible to him. He once again blamed himself for making the mistake of buying such an old piece of equipment and we "parted as friends".
I still feel for the poor lonely instrument enveloped in darkness...

Raymond


Re: Defective 465: into the dumpster it goes!

BW
 

always sad to see something that could have been easily fixed go in the trash... especially when spares are harder and harder to find for older gear like that.

*goes back to watching his 1953 Hallicrafters 815 TV*


Looking for: 2445A GPIB badge, 2.5mm probe parts

BW
 

Hi all ,
Per the title, I'm hoping someone stateside is cleaning house or parting out and maybe has the following:
-2445A CRT badge with the GPIB holes/markings
-Either 2.5mm hooks (013-0107-06) or 3.5mm adapters (013-0202-0x) for the P613x series probes

Can be reached off-list, uniacke1 [a] yahoo [d] ca

Thanks in advance!

P.S: Long shot but also potentially interested in a DM option 01 parts if someone's parting out a dead 2400 series with that option.


Re: 2465/7B NVRAM images

BW
 

For what it's worth, I added a GPIB card to my 2445A without issue. It was automatically recognized and setup with the defaults. (Naturally, it doesn't have any calibrated measurements, I'd imagine the CTT or DMM option would need that before the values are particularly meaningful.)

At least with the older EAROM scopes which had limited write cycles, I doubt the nvram was used for stacks and temporary data; saner just to put in a few kb of volatile ram instead.


Re: Defective 465: into the dumpster it goes!

nonIonizing EMF
 

On Sat, Aug 31, 2019 at 03:01 PM, Raymond Domp Frank wrote:


I still feel for the poor lonely instrument enveloped in darkness...
Think of all the investment over the years to develop everyone involved with the operations to develop, manufacture, sell, use and repair that Made in the U.S.A instrument. Bummer. I just rescued my first tube oscilloscope and told the gentleman that was my first HP oscilloscope... then on the ride home I recalled I had the 16533 card in the logic analyzer and felt bad for misinforming. Still... I have a 475A and a 465 if I recall correct, has similar or the same parts somewhat that can be swapped and the DM44 came with also as I've been looking for one to compliment the 475A I have. I was also wondering if there are any parts the H12-175A has that can be used on a Tektronix scope just to consider options since I might want some of the front panel components for other projects if I don't use as a heater.


Re: Defective 465: into the dumpster it goes!

keantoken
 

It sounds to me like it got dropped and he didn't want to admit it!

On Saturday, August 31, 2019, 06:26:12 PM CDT, JJ <jajustin@...> wrote:

Such a beautiful scope - I have one. Probably just a bad cap in the power supply section! What a waste! What a pinhead!

RIP 465!

JJ


Re: 2465/7B NVRAM images

Chuck Harris <cfharris@...>
 

NVRAM images follow the same theme, but they are not
necessarily identical from revision to revision, or from
option to option... or even day to day.

Remember, the NVRAM is also the working memory for the
scope, so it has all of the stack, heap and data space
stored in it. Everything, but the important stuff gets
erased and refreshed when the power cycles.

Nothing is pre-stored in the NVRAM. A virgin NVRAM is set
up from scratch by the EPROM code in the scope, and the
EPROM code in the options.

I have seen some funny behavior when a NVRAM (or an A5 card)
from a scope is transplanted into a scope that has different
options.

A full calibration should be done whenever that occurs.

-Chuck Harris

Jean-Paul wrote:

Hello all curious about NVRAMs data.

Do the 2456B NVRAM images differ for various options eg 06, 09 GPIB, WR, CTT?

Or for different serial number ranges?

Or perhaps NVRAM images are same for all scopes of a type?

In other words are the options and serial range pre- stored in the NVRAM?

Many thanks


Jon





Re: Tektronix TLS216

Harvey White
 

This seems to be (to me) mostly a logic analyzer with some analog capabilities.  However, this is the first time I've heard of one.

If you want a conventional scope, then I'd suggest you go for one, either digital or analog as you prefer.

If you want a logic analyzer (and *need* one), then I might suggest getting one separately.  I have an HP16702B that I like a lot.  However, TEK logic analyzers tend to drive me up a tree, and HP doesn't.  On the other hand, I'm not too fond of early HP scopes, so that I find irritating.

This seems to be mixed bag.   I have an HP dso, and it's treatment of the digital line of things seems to be lacking... I"ve not liked it, but that's perhaps personal.


Bottom line is that I'd see if I like the presentation and it makes sense, the I'd go look for the probes.  However, I'd also consider a separate scope and logic analyzer, if they fit.

Harvey

On 8/31/2019 3:51 PM, Chris J via Groups.Io wrote:
Hi all,

I am looking to the group for suggestions/recommendations as I am in the market for a decent DSO. I currently have a TLS216, in fine condition, without probes (therefore not useful at all). Is this unit worth holding onto and gathering up probes for this unit or would it make more sense to move on to another unit with conventional BNC connectors, for ease?

Thank you,

CJ




Re: Buying replacement tubes

Harvey White
 

Not sure that the cost is in the taxidermy.  However, have you checked the price of the base and tracks needed to do this? likely very expensive.

Then, as in life, you have the problem of keeping the recently departed on the right track.....

Harvey

On 8/31/2019 5:55 PM, ArtekManuals wrote:
Phil

The replacement for the 5AR4 is a couple of solid sates diodes. You can simply solder them to the tube  socket underneath the chassis and leave the old dead 5AR4 plugged in for appearances ....... 8^).

It is too bad we cant get our loved ones taxidermy'd  ...stand them up next to the xmas tree on a roll around base with a drink in their hand

Dave
manuals@...

On 8/31/2019 5:45 PM, Phillip Potter wrote:
Hi Chuck,

While I was reading your comment to Jamie, I note with interest your suggestion that a 5AR4 is of little demand.? This tube number jogged my memory, and I found it easily in the Service Manual for my HP 200CD Signal Generator, where it is employed as a rectifier tube... I'm hoping that you're right about that, because I could use one for a spare. ;)

Phil

On 8/30/2019 6:45 PM, ChuckA wrote:
BTW a workable replacement for the 5AR4 is a 5V4 again a TV damper tube and very little demand outside of the TV collector community.



Re: Buying replacement tubes

Harvey White
 

IIRC, the difference is (from a 5U4) that there's a cathode, with a heater.  Some of the other ones have a heater only.  Whether the heater is isolated or not, I don't remember.  Unless the requirements are for an isolated cathode, you may be ok.  A quick look at the pinouts for the 5U4 and 5AR4 would verify this.

Harvey

On 8/31/2019 5:45 PM, Phillip Potter wrote:
Hi Chuck,

While I was reading your comment to Jamie, I note with interest your suggestion that a 5AR4 is of little demand.? This tube number jogged my memory, and I found it easily in the Service Manual for my HP 200CD Signal Generator, where it is employed as a rectifier tube... I'm hoping that you're right about that, because I could use one for a spare. ;)

Phil

On 8/30/2019 6:45 PM, ChuckA wrote:
BTW a workable replacement for the 5AR4 is a 5V4 again a TV damper tube and very little demand outside of the TV collector community.



Re: Defective 465: into the dumpster it goes!

JJ
 

Such a beautiful scope - I have one. Probably just a bad cap in the power supply section! What a waste! What a pinhead!

RIP 465!

JJ


Re: Buying replacement tubes

Phillip Potter
 

Hi Dave,

Thanks for the tip... actually, BOTH tips!!! ;)

Best to you,

Phil

On 8/31/2019 2:55 PM, ArtekManuals wrote:
...stand them up next to the xmas tree on a roll around base with a drink in their hand


Re: Tektronix 011-0069-02 Attenuator

Dale H. Cook
 

Jean-Paul -

I would also note that the HAT-6 is only a 1 Watt attenuator, and I need a 2 Watt attenuator.
--
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/


Re: Buying replacement tubes

Stephen Hanselman
 

I have 3 5V4’s if somebody wanted one

Regards,

Stephen Hanselman

On Aug 31, 2019, at 15:08, Richard Knoppow <dickburk@...> wrote:

I vaguely remember using a 5AR4 as the rectifier for a tube amp I built maybe sixty years ago. It seems to me, without looking it up, it has a separate cathode and probably lower voltage drop than the filamentary cathode types. If some audiophile wants better B+ regulation silicon diodes are the way to go but a regulated power supply is better. OTOH, the DWP (power in Los Angeles) refused to install a solid silver pole pig here so I have given up on improving the supplies of my audio amplifiers. I wonder if you used a local generator for audio of the Fools would argue about the brand of gasoline (or diesel fuel) used to run it.

On 8/31/2019 2:45 PM, Phillip Potter wrote:
Hi Chuck,
While I was reading your comment to Jamie, I note with interest your suggestion that a 5AR4 is of little demand.? This tube number jogged my memory, and I found it easily in the Service Manual for my HP 200CD Signal Generator, where it is employed as a rectifier tube... I'm hoping that you're right about that, because I could use one for a spare. ;)
Phil
On 8/30/2019 6:45 PM, ChuckA wrote:
BTW a workable replacement for the 5AR4 is a 5V4 again a TV damper tube and very little demand outside of the TV collector community.
--
Richard Knoppow
dickburk@...
WB6KBL



Re: Tektronix 011-0069-02 Attenuator

Dale H. Cook
 

On 8/31/2019 5:36 PM, Jean-Paul wrote:

Dale, we use Mini Circuits HAT series attenuators DC-2GHz, $10 ea, highly recommended
Better than the old TEK parts.
I sometimes use my Mini Circuits CAT series attenuators in 6, 10, and 20 dB, but I prefer the Tek attenuators, and most of my fixed in-line attenuators are Tek or GR using BNC or GR 874 connectors. For my purposes the Tek is ideal, as well as matching other Tek BNC attenuators and terminations that I own.
--
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/


Re: Tektronix 011-0069-02 Attenuator

Dale H. Cook
 

On 8/31/2019 4:53 PM, Dennis Tillman wrote:

I have no idea from your post what it is since I don't have any way to find
out more about this part number. I'm sure I'm not alone.
Dennis -

Scans of Tek catalogs are easily available online, and I would expect that anyone who deals much with Tek would have some of them. I have some of what is available online but seldom use them as I own about 75% of the Tek catalogs from 1970 to 1993 in print.

For those unfamiliar with the Tek line of external attenuators and terminations, most of which were in production in the '70s, '80s, and '90s, see the selection guide to some of them at:

https://www.tek.com/dl/attenuators_term_sg_v2.pdf

I was asking about the 011-0069-02 because my other Tek attenuators are the -02 versions, but the -01 or -03 version would do as well for my purposes. The 011-0069-02 is a 50 Ohm, 2 Watt, 6dB fixed attenuator with male and female BNC connectors for in-line use. It has a VSWR of <1.1 from DC to 1 GHz and <1.2 from DC to 2 GHz. It is a stand-alone accessory and not used in anything.

Also, since you mention that $60 is too much, what are you willing to pay
for one?
I think $30.00 would be reasonable plus CONUS USPS first class postage. It is about 2-1/2" long, 3/4" wide, and weighs about 4 oz.
--
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/


Re: Defective 465: into the dumpster it goes!

Bob Albert
 

The reverse Midas touch, apparently.
Geez, if something doesn't work and can't be fixed, it certainly offers a wealth of recyclable parts.
Bob

On Saturday, August 31, 2019, 03:01:42 PM PDT, Raymond Domp Frank <hewpatek@...> wrote:

What follows is a longish and sad story.
A few days ago, I was contacted by someone who said he was looking for a good quality analog 'scope.
Without asking many questions, I showed him one of my 465's and he liked it. He expressed some concern as to the reliability of these very old instruments (I think this sample was from 1976/77). I told him that these old 'scopes were still "more usable than unreliable", that some parts did tend to fail from old age, especially the dipped tantalum caps but that diagnosis and repair was straightforward, that I would take care of repair for some time in the future for free and that I had an ample spare components supply of all sorts should they be needed.
He was going to use the 'scope mainly for adjusting radio receivers and was looking forward to the high vertical sensitivity, especially when using a 1:1 probe. This should have been a warning for me but I limited myself to explaining why the use of passive 1:1 probes cannot be recommended for some of his intended use (450 kHz and 10.7 MHz IF) and giving him an example of the math.
We agreed on a price and he left, happy with his newly acquired classic, or so I thought.
After a few days, he contacted me, asking for two knobs (A and B trigger level), since apparently parts had broken off. I told him that I'd send replacements for free.
Before I could send them, he contacted me, saying that the replacement knobs were no longer needed since the 'scope had broken down: no beam, no graticule illumination, no fan sound, and that he had concluded that his 'scope obviously was a total loss. He was sorry to tell me the bad news but he had very much appreciated my explanations and service and he definitely wouldn't want any money back. When I offered to repair the 'scope for free, he added that that wouldn't be possible, since it was now in an underground dumpster, inaccessible to him. He once again blamed himself for making the mistake of buying such an old piece of equipment and we "parted as friends".
I still feel for the poor lonely instrument enveloped in darkness...

Raymond


Re: Buying replacement tubes

Richard Knoppow
 

I vaguely remember using a 5AR4 as the rectifier for a tube amp I built maybe sixty years ago. It seems to me, without looking it up, it has a separate cathode and probably lower voltage drop than the filamentary cathode types. If some audiophile wants better B+ regulation silicon diodes are the way to go but a regulated power supply is better. OTOH, the DWP (power in Los Angeles) refused to install a solid silver pole pig here so I have given up on improving the supplies of my audio amplifiers. I wonder if you used a local generator for audio of the Fools would argue about the brand of gasoline (or diesel fuel) used to run it.

On 8/31/2019 2:45 PM, Phillip Potter wrote:
Hi Chuck,
While I was reading your comment to Jamie, I note with interest your suggestion that a 5AR4 is of little demand.? This tube number jogged my memory, and I found it easily in the Service Manual for my HP 200CD Signal Generator, where it is employed as a rectifier tube... I'm hoping that you're right about that, because I could use one for a spare. ;)
Phil
On 8/30/2019 6:45 PM, ChuckA wrote:
BTW a workable replacement for the 5AR4 is a 5V4 again a TV damper tube and very little demand outside of the TV collector community.
--
Richard Knoppow
dickburk@...
WB6KBL


Defective 465: into the dumpster it goes!

 

What follows is a longish and sad story.
A few days ago, I was contacted by someone who said he was looking for a good quality analog 'scope.
Without asking many questions, I showed him one of my 465's and he liked it. He expressed some concern as to the reliability of these very old instruments (I think this sample was from 1976/77). I told him that these old 'scopes were still "more usable than unreliable", that some parts did tend to fail from old age, especially the dipped tantalum caps but that diagnosis and repair was straightforward, that I would take care of repair for some time in the future for free and that I had an ample spare components supply of all sorts should they be needed.
He was going to use the 'scope mainly for adjusting radio receivers and was looking forward to the high vertical sensitivity, especially when using a 1:1 probe. This should have been a warning for me but I limited myself to explaining why the use of passive 1:1 probes cannot be recommended for some of his intended use (450 kHz and 10.7 MHz IF) and giving him an example of the math.
We agreed on a price and he left, happy with his newly acquired classic, or so I thought.
After a few days, he contacted me, asking for two knobs (A and B trigger level), since apparently parts had broken off. I told him that I'd send replacements for free.
Before I could send them, he contacted me, saying that the replacement knobs were no longer needed since the 'scope had broken down: no beam, no graticule illumination, no fan sound, and that he had concluded that his 'scope obviously was a total loss. He was sorry to tell me the bad news but he had very much appreciated my explanations and service and he definitely wouldn't want any money back. When I offered to repair the 'scope for free, he added that that wouldn't be possible, since it was now in an underground dumpster, inaccessible to him. He once again blamed himself for making the mistake of buying such an old piece of equipment and we "parted as friends".
I still feel for the poor lonely instrument enveloped in darkness...

Raymond

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