Date   

Re: Tek items for sale, OK to post?

radioranchhand
 

Where in California are you? How do I get the list.
Thanks,
Harry



---In TekScopes@..., <devnull8it@...> wrote :

Hello everyone,I have been a (mostly) silent participant in this list for some time. I am leaving the hobby and would like to ask if it is OK to post some Tek items for sale on the list?
Thanks!Mike


Noob

Phar Kwit
 

Hello All,
Just joined and following group protocol I'm briefly making my introduction.
I've never been a member of an online group before so I'll be taking it slow for a bit until I learn the ropes.
Anyway, originally spent a decade or so in and around electronics but drifted away with the advent of computing.
A few years ago I started getting back into it a bit more and have slowly built a small inventory of test gear, the majority being TEK,
most of which has seen more than its' fair share of sunrises and needs the usual TLC to get it performing as intended.
Hence, this is one of THE places to be.
Thus far, the small TEK collection includes: a pair of 545B's, a 317M, a 5111A, a 5103, a 466 and a 465M. A couple have
significant problems while the rest basically work with various minor details to work on.
I'd like to add more to the family as availability and finances permit.
Cheers,
David.


Re: Inventory reduction sale

David Berlind
 

How far a drive is that from San Diego? I will be there on business next
week but don't have transportation.


On February 9, 2017 8:34:10 PM "greg16417@... [TekScopes]"
<TekScopes@...> wrote:

All I can say is wow - I thought I was a hoarder... nice stuff though.
<Contemplating the drive from PA to CA> It makes my pile look smaller now.
Can we get a picture of it all so that the next time we are accused of
having too much stuff we can use that as an argument? I completely
understand the lack of shipping though as that could become a career in
itself. Maybe consider one of those pack and ship places that you just
drop off and the seller pays the packer/shipper for the services? Of
course maybe you'll get lucky and someone will show up with an empty truck
and a basket of cash.

Good luck!


Greg






Re: Inventory reduction sale

Greg B
 

All I can say is wow - I thought I was a hoarder... nice stuff though. <Contemplating the drive from PA to CA> It makes my pile look smaller now. Can we get a picture of it all so that the next time we are accused of having too much stuff we can use that as an argument? I completely understand the lack of shipping though as that could become a career in itself. Maybe consider one of those pack and ship places that you just drop off and the seller pays the packer/shipper for the services? Of course maybe you'll get lucky and someone will show up with an empty truck and a basket of cash.

Good luck!


Greg


Re: Tek items for sale, OK to post?

Dave Casey
 

Historically, it's not been a problem to post your lists to the list. But
if you're not going to do that, feel free to send it to me directly.

Dave Casey

On Thu, Feb 9, 2017 at 6:26 PM, Robert Muth muthrb@... [TekScopes] <
TekScopes@...> wrote:



I'd like to see the list also. Bob Muth

Sent from my iPhone

On Feb 9, 2017, at 12:41 PM, Jerry Massengale jmassen418@...
[TekScopes] <TekScopes@...> wrote:

better than trashing parts

On Wed, Feb 8, 2017 at 11:13 AM, albert prazolam devnull8it@...
[TekScopes] <TekScopes@...> wrote:



Hello everyone,I have been a (mostly) silent participant in this list
for
some time. I am leaving the hobby and would like to ask if it is OK to
post
some Tek items for sale on the list?
Thanks!Mike

[Non-text portions of this message have been removed]


[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]



[Non-text portions of this message have been removed]


Re: Tek items for sale, OK to post?

Robert Muth
 

I'd like to see the list also. Bob Muth

Sent from my iPhone

On Feb 9, 2017, at 12:41 PM, Jerry Massengale jmassen418@... [TekScopes] <TekScopes@...> wrote:

better than trashing parts

On Wed, Feb 8, 2017 at 11:13 AM, albert prazolam devnull8it@...
[TekScopes] <TekScopes@...> wrote:



Hello everyone,I have been a (mostly) silent participant in this list for
some time. I am leaving the hobby and would like to ask if it is OK to post
some Tek items for sale on the list?
Thanks!Mike

[Non-text portions of this message have been removed]


[Non-text portions of this message have been removed]


[Non-text portions of this message have been removed]


Re: its a 545H

Artek Manuals <manuals@...>
 

Maybe this is a Model H plug-in in a 545 mainframe? again photo would
help.

I did not check to see if the 545 accepts H type plug-ins

Dave

manuals@...


On 2/9/2017 5:52 PM, KNGTRON@... [TekScopes] wrote:

sorry , I got the number wrong , its a 545H

[Non-text portions of this message have been removed]

--
Dave
Manuals@...
www.ArtekManuals.com


Re: its a 545H

Artek Manuals <manuals@...>
 

Still does not make sense ...can you post a photo of the actual scope
with a close up of the model number?

I cant think of any 400 or 500 series with a model suffix higher than "B"

Dave

manuals@...


On 2/9/2017 5:52 PM, KNGTRON@... [TekScopes] wrote:

sorry , I got the number wrong , its a 545H

[Non-text portions of this message have been removed]

--
Dave
Manuals@...
www.ArtekManuals.com


its a 545H

kngtron
 

sorry , I got the number wrong , its a 545H


type 454H

kngtron
 

can anybody provide info on a 454H scope , I see 454 , 454A and 454B info and prints , thanks


Re: Tek 2465 timebase issue

Craig
 

I had 2465 problem with similar symptoms several years ago that turned out to be a leaky cap.

My original write up is here:

https://groups.yahoo.com/neo/groups/TekScopes/conversations/messages/110470 https://groups.yahoo.com/neo/groups/TekScopes/conversations/messages/110470

Good luck, this was a bear of a problem to find.

Craig


Inventory reduction sale

Reed Dickinson
 

Greetings fellow Tekies:

I read, with interest, the current string regarding selling Tek products on this forum. I have debated doing this for months and I have now decided it is time to act. I am 82, retired, and I realize that I no longer have the time, energy nor desire to refurbish all these scopes so, I am offering them for sale.

I have 196 scopes in my garage. The inventory is as follows:

465 28
465B 42
466 8
468 37
475 55
475A 20
7854 6

Total 196

Most of these scopes came from the now defunct Hughes Aircraft plant here in Southern California.
Picking up these scopes at my home is the way to get these scopes. I also have many other Tek products,
write me and state your needs and I will reply.

My minimum price for any of these complete scopes is $50. I am asking $70 for those with the DM option. For the 468's and 475's (A) I am asking $75.
A few of these scopes have been used for parts and one parts scope will be given away free for a purchase of every 5 complete scopes.

I also have 53 of the 485 models. These are my favorite scopes and I might be persuaded to part with some of these.

All are in Tustin, Orange County, CA. I am not prepared to ship these scopes so it is on a first come, first served basis. Offers on 10 or more would be considered.
If you want to have an outside shipper pick up and pack a scope(s), at buyers expense, that can be arranged.

For a fee I could test each scope up to a trace only level depending on the state of the scope.
The 7854's are a difficult scope to work on but it appears that each one is complete. I would negotiate a fair price on each 7854. I have two keyboards for these scopes which I would sell separately.

I, and my wife, would love it is someone would arrive in a big truck and haul everything away.

Write me at reed714@... and we can discuss your desires.

Reed Dickinson
1705 Stonehenge Drive
Tustin, CA 92780


Re: Tektronix 2440 waveform noise above 200nS timebase

Szabolcs Szigeti
 

Hi David,

Out of curiosity, I did a quick measurement with my 2440.


Using the scope's measurement function for RMS and Vp-p, I got these. 2mV/div, DC coupling, line triggering. Did a self cal before testing. Repet more off.


1ms sweep:
CH1: Vpp: 640uV RMS: 180uV
CH2: Vpp: 640uV RMS: 130uV


200us sweep:
CH1: Vpp: 640uV RMS: 190uV
CH2: Vpp: 640uV RMS: 140uV



200ns sweep:
CH1: Vpp: 960uV RMS: 150uV
CH2: Vpp: 960uV RMS: 180uV



100ns sweep:
CH1: Vpp: 960uV RMS: 150uV
CH2: Vpp: 1200uV RMS: 210uV



RMS measurements fluctuate a lot, and sometimes show negative values, so I'm not sure how much they can be trusted. Vp-p probably should be measured in envelope mode for highest accuracy.


So the noise is pretty much consistent over some of the sweep ranges, except for CH2, where some additional spikes appear at the 100ns range, with around 16MHz repetition frequency. (This I need to investigate) This is seen on the screen and obvious in the measured values.
Bandwidth limiting noticeably reduces the noise, as expected, so I assume most of the noise is of analogue source.
Warm-up and selfcal also has a very noticeable effect on noise.


Szabolcs


Re: Tektronix 2440 waveform noise above 200nS timebase

 

The problem with Dave's video, and I told him this but he never
responded, is that he didn't quantitatively measure the noise which he
could have done. He just eyeballed it.

A couple months ago we were investigating problems on the Rigol
DS1000Z series and found another one ... it does not make RMS
measurements correctly. Rigol does not even admit there is a problem.

If the measurements are to be believed which is Rigol's position, then
the DS1000Z series has more than 10 times the noise of an analog
100MHz oscilloscope. All of the modern DSOs we looked at had more
noise than a Tektronix 7A13 which itself has terrible noise but for a
good reason; it has differential inputs and all of the extra active
circuitry to support a wide common mode range.

I like using the 7A13 as my 100 MHz noise benchmark because its high
sensitivity makes it easy to measure and it is bad enough to see and
measure visually. A 7A18 for instance has less noise than a 7000
mainframe so you have to take extra steps to measure it.

As far as the 2440, I do not have much to compare it to but it does
not seem to have significantly more noise than any other DSO when it
is working properly. The 2440 does have horrible overdrive recovery
but at least it is so bad that you know you overloaded it.

On 09 Feb 2017 19:20:27 +0000, you wrote:

Hi,

Exactly. Dave Jones has a good video on this DSO noise topic.

https://www.youtube.com/watch?v=Znwp0pK8Tzk https://www.youtube.com/watch?v=Znwp0pK8Tzk

Szabolcs


Re: Tektronix 577-D1 curve tracer-- any things to look for?

 

Harmonica connectors are easy enough to key. Cut one of the pins off
and fill in the associated hole with epoxy. They also make little
plastic plugs to do this.

On 09 Feb 2017 18:35:53 +0000, you wrote:

Yes, those harmonica connectors are handy and kind of universal, but easy to mis-register the pins. I have done that too a few times over the years, but fortunately in my cases, it only caused things to not work, rather than damaging circuits.

I still use the harmonicas for building things - I have lots from scrapped out Tek gear mostly - but prefer the more modern types that are keyed in various ways. I have saved a lot especially from scrapped consumer gear like VCRs.

Even with proper keying, nothing is absolutely foolproof or brute force-proof. Just yesterday I managed to jam a PC133 DIMM into a motherboard socket backwards. I have been rebuilding some of my old PCs for retasking, and got careless after much swapping of parts and experimenting. It was one of those deals where there's cabling and parts all in the way, not enough light, and worsening vision. I went mostly by feel, and got it to clip in, even though one end couldn't engage due to the keys in the socket. Normally, I would have done a final visual check, but was in a hurry.

When I turned it on it wouldn't boot, and I saw what I thought were cobwebs blowing in the breeze from the fans. It was actually smoke cooking out from runs burning up on the DIMM. Fortunately, the motherboard seems OK, but the DIMM, not so much. That was the first time I ever did that, and hopefully the last.

Ed


Re: Tektronix 2440 waveform noise above 200nS timebase

Szabolcs Szigeti
 

Hi,

Exactly. Dave Jones has a good video on this DSO noise topic.


https://www.youtube.com/watch?v=Znwp0pK8Tzk https://www.youtube.com/watch?v=Znwp0pK8Tzk



Szabolcs


Re: Tektronix 577-D1 curve tracer-- any things to look for?

Ed Breya
 

Yes, those harmonica connectors are handy and kind of universal, but easy to mis-register the pins. I have done that too a few times over the years, but fortunately in my cases, it only caused things to not work, rather than damaging circuits.

I still use the harmonicas for building things - I have lots from scrapped out Tek gear mostly - but prefer the more modern types that are keyed in various ways. I have saved a lot especially from scrapped consumer gear like VCRs.

Even with proper keying, nothing is absolutely foolproof or brute force-proof. Just yesterday I managed to jam a PC133 DIMM into a motherboard socket backwards. I have been rebuilding some of my old PCs for retasking, and got careless after much swapping of parts and experimenting. It was one of those deals where there's cabling and parts all in the way, not enough light, and worsening vision. I went mostly by feel, and got it to clip in, even though one end couldn't engage due to the keys in the socket. Normally, I would have done a final visual check, but was in a hurry.

When I turned it on it wouldn't boot, and I saw what I thought were cobwebs blowing in the breeze from the fans. It was actually smoke cooking out from runs burning up on the DIMM. Fortunately, the motherboard seems OK, but the DIMM, not so much. That was the first time I ever did that, and hopefully the last.

Ed


Re: Tek items for sale, OK to post?

Jerry Massengale <jmassen418@...>
 

better than trashing parts

On Wed, Feb 8, 2017 at 11:13 AM, albert prazolam devnull8it@...
[TekScopes] <TekScopes@...> wrote:



Hello everyone,I have been a (mostly) silent participant in this list for
some time. I am leaving the hobby and would like to ask if it is OK to post
some Tek items for sale on the list?
Thanks!Mike

[Non-text portions of this message have been removed]



[Non-text portions of this message have been removed]


Re: Tek items for sale, OK to post?

Daniel Koller
 

Actually, please put the list ON-LINE and perhaps include suggested asking prices and especially your zip code (to see if shipping will be painful or not) and take replies off-line.   That would save some "bandwidth" in us all asking what you have to offer.
Thanks,
  Dan(p.s. I do not speak in any official capacity, but my guess from other's past experience is that it's ok to post).

On Thursday, February 9, 2017, 11:00:26 AM EST, 'David C. Partridge' @perdrix [TekScopes] <TekScopes@...> wrote: 
Never been a problem before ... Just say what you have and how much you want
and where you live (some members are outside ConUS!!)

Dave

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 09 February 2017 15:29
To: TekScopes@...
Subject: [TekScopes] Re: Tek items for sale, OK to post?

I'm not sure of the etiquette here, but if it's not OK to post I would still
be interested in a list of items for sale offline.

Thanks,
Greg


[Non-text portions of this message have been removed]

------------------------------------
Posted by: greg16417@...
------------------------------------

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Re: Tek 2465 timebase issue

Mark
 

Excellent - lets see. I've ordered a load of bits (including replacement
caps for the PSU) from Farnell and they should be here tomorrow.



I will report back at the weekend.



Mark



From: TekScopes@... [mailto:TekScopes@...]
Sent: 09 February 2017 15:49
To: TekScopes@...
Subject: Re: [TekScopes] Tek 2465 timebase issue





On Wed, 8 Feb 2017 at 23:45 'Mark, G0MGX' @G0MGX
<mailto:@G0MGX> [TekScopes] <
TekScopes@... <mailto:TekScopes@...> > wrote:



The voltage at pin 7 of U910 is 16.4V

R724 measures 35.45K and R723 3.482K. However applying the very slightest
of
pressure to lift R724 off the board at one end has snapped it clean in
half.

I'll replace them and report back.

Sweet - hopefully that was your problem right there. These are specified
as 1% and 0.5% film resistors - does that match the resistors you found
there?
Note that the stability of these resistors is critical to maintaining
calibration over time and temperature, and their actual value will be baked
into your current sweep calibration.

Not sure I've understood the "Do you see the same ratio across all sweep
speeds" question; however the frequency displayed at all sweep speeds
above
5ns is about 1.5x that of the input value. That's consistently inaccurate
on
all settings except 5ns where it seems very close to correct. So for
example, if I have a 10MHz input signal with a 20ns sweep time I measure
about 15MHz frequency on the 'scope sweep A, but sweep B is 10MHz.
Ok - the resistors set the reference current for all the sweep speeds,
except - I suspect - the 5ns/DIV sweep. I suspect the B sweep hybrid
actually does the 5ns/DIV sweep, as there's mention of a bypass in the
datasheet for the sweep die.
It also makes sense from the perspective that you can't have a B-sweep
zoomed into the fastest A-sweep anyway, so you might as well only calibrate
the 5ns/DIV B-sweep.

If the error wasn't consistent across all sweep speeds, you'd want to look
in the components that are specific to a particular range of speeds - like
the timing capacitors, or e.g. the switching transistor for the lowest
sweep speeds.







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