Date   
Re: Tek 2215

Tothwolf
 

On Mon, 25 Jan 2016, David @DWH [TekScopes] wrote:

The replacements were physically smaller than the original parts. I
thought Tektronix might have selected the originals for good RF
performance but other than size, they are the same series of film
resistors used throughout the rest of the oscilloscope and a transient
response test showed that the new physically smaller replacements
worked fine.

I did not check it before since I did not have more than one resistor
to select from but the Dale MFF series datasheet says "very good high
frequency characteristics" for whatever that is worth:

http://www.33audio.com/enter/data/DaleFilmpart2.pdf
I believe I found them. They are actually the same Vishay/Dale CCF series I was going to use for R398 and R399, although it appears I inadvertently ordered 15 ohm instead of 51 ohm for those two (good thing I only purchased 10), so I guess those are going on the next parts order.

R378,R379,R388,R389 340 ohm 1% 1/2W metal film Dale MFF1226G340R0F

Replace with Vishay/Dale CCF60340RFKE36

R398,R399 51 ohm 5% 1/2W carbon comp Allen-Bradley EB5105

Replace with Vishay/Dale CCF6051R1FKE36 (51.1ohm, but close enough ;)

Re: Viable alternative to Yahoo

stefan_trethan
 

This comes up every few months.
Short story is, as much as people dislike and distrust yahoo, in the
end it turns out they distrust you even more (hard truth, I know).

And they definitely do not like change, at all.

Until yahoo croaks for good (which is likely) you are wasting your time.
Time and time again yahoo has introduced ever more stupid changes, and
people said, right, that's it, we gotta be outta here. Nothing ever
happened. I have become convinced we hang on to the bitter end, even
if it comes down to communicating in morse code by clicking on
advertisements.

One suggestion that comes up most times is that the best option would
be to tack ourselves onto an exsisting reliable forum if yahoo goes
away. EEV blog from Dave Jones was named before as an example. As much
as I may dislike the personality the man runs a tidy ship and it would
seem entirely reasonable to me to use an established platform rather
than have someone set up something new.

ST

On Tue, Jan 26, 2016 at 6:09 AM, Dwayne Verhey tekscopes@...
[TekScopes] <TekScopes@...> wrote:
Who said anything about charging or paying? I do not propose any fees
(or advertising -- I hate advertising). I already have the bandwidth and
storage to support this.

I was thinking of Mailman for an e-mail discussion list, or PHPBB for a
web forum. Mailman has a web archive similar to Yahoo, but no means of
submitting or replying via the web interface. PHPBB has e-mail
notification capability, but posts are only via the web interface. If
the ability to post from both e-mail and a web UI is important, I could
try setting up a Drupal based site with Mailman integration, but I've
not tried that before, so there would be a learning curve at my end.


On 25/01/2016 9:25 PM, David @DWH [TekScopes] wrote:


I doubt anybody is going to pay for it except voluntarily.

It would not be a replacement unless it support both email and web
access. Personally I have no idea how people put up with web access
to technical discussion forums but it is a good feature to have for
less experienced users. At the same time it is a lot less convenient
and useful than a simple email list server.

Re: Viable alternative to Yahoo

Tothwolf
 

On Tue, 26 Jan 2016, Dwayne Verhey tekscopes@... [TekScopes] wrote:

Who said anything about charging or paying? I do not propose any fees (or advertising -- I hate advertising). I already have the bandwidth and storage to support this.

I was thinking of Mailman for an e-mail discussion list, or PHPBB for a web forum. Mailman has a web archive similar to Yahoo, but no means of submitting or replying via the web interface. PHPBB has e-mail notification capability, but posts are only via the web interface. If the ability to post from both e-mail and a web UI is important, I could try setting up a Drupal based site with Mailman integration, but I've not tried that before, so there would be a learning curve at my end.
This is a perennial topic that comes up at least several times a year. Until Yahoo finally completely falls apart, I don't really see this email list/group going anywhere. I happen to know someone who has both the infrastructure and background to host these sorts of lists (already hosts a number of high traffic email lists and has done so for well over a decade), and if Yahoo does eventually go belly up or decide to discontinue support for these groups, he would be the first person I would contact.

Re: Viable alternative to Yahoo

Torch Fireman
 

Who said anything about charging or paying? I do not propose any fees (or advertising -- I hate advertising). I already have the bandwidth and storage to support this.

I was thinking of Mailman for an e-mail discussion list, or PHPBB for a web forum. Mailman has a web archive similar to Yahoo, but no means of submitting or replying via the web interface. PHPBB has e-mail notification capability, but posts are only via the web interface. If the ability to post from both e-mail and a web UI is important, I could try setting up a Drupal based site with Mailman integration, but I've not tried that before, so there would be a learning curve at my end.

On 25/01/2016 9:25 PM, David @DWH [TekScopes] wrote:


I doubt anybody is going to pay for it except voluntarily.

It would not be a replacement unless it support both email and web
access. Personally I have no idea how people put up with web access
to technical discussion forums but it is a good feature to have for
less experienced users. At the same time it is a lot less convenient
and useful than a simple email list server.

Re: Tek 2215

Tothwolf
 

On Mon, 25 Jan 2016, David @DWH [TekScopes] wrote:
On Mon, 25 Jan 2016 01:36:53 -0600 (CST), you wrote:
On Mon, 25 Jan 2016, David @DWH [TekScopes] wrote:

There was another resistor change Tektronix made and I think it was for reliability. The 2213 and 2215 use two 1/2 watt 1% metal film resistors in series for the collector loads at the output of the vertical amplifier. These resistors run hot making them unreliable and were the first 2213/2215 repair that I made and I know of two other instances where they had to be replaced. The later models used 3 resistors in series for each collector load to distribute the heat better.

The collector load resistors are not difficult to replace so I would change them also.
Are those the 4 resistors mounted to the board plus the two inline with V+ and V- on the left side of the board in this photo? One of my scopes has one carbon comp and one carbon film for the two inline resistors. I'm planning to replace the two inline resistors with Vishay CCF6015R0FKE36 and the 18K R877 with a Vishay CCF0718K0GKE36. I hadn't planned to replace the 4 resistors on the board, but they look like they might be 1W parts. I've seen photos of these boards where the board is discolored badly from heat around those 4 resistors.

http://strudel.ignorelist.com/~tothwolf/photos/Tektronix_2213/Tektronix_2213_3/1600/IMG_9288.1600.jpg
Sorry for taking so long to respond. Those are the ones.

The parts list says they are 1/2 watt 1% film 340 ohm resistors (and metal film based on the part number) and since there was only one modern choice matching that available, I was not picky. I bought 10 from Mouser, replaced the 4, and left the remaining 6 inside a bag taped to the inside of the chassis with a note.

The originals in my case were visibly discolored and cracked and once removed, their coating flaked off. I was able to replace them without removing the CRT using needle nose pliers. The original parts were spaced above the printed circuit board so I used the shaft from a Q-tip as a temporary spacer during installation.
I didn't notice any cracks in the coating of those resistors in my 2213 scopes. All 3 of my 2213 scopes have those 4 resistors mounted close to the board so I'm wondering now if I should replace them and space them away from the board. B0233xx in the photo above got a lot more use than either B0228xx or B0229xx and the board under those 4 resistors is just starting to discolor.

I initially only had the CRT out of B0233xx so I could replace the damaged front bezel.

I've been using Richco CER-6 ceramic spacers (~$0.073/ea) to space these type of components off the board (pointed end goes towards the board). I also used them on the preregulator boards when I replaced R911, 150K 1W carbon comp. The replacement metal oxide resistor in the photo below is actually a 2W part even though it is physically smaller than the original.

http://strudel.ignorelist.com/~tothwolf/photos/Tektronix_2213/Tektronix_2213_2/1600/IMG_9112.1600.jpg

The replacements were physically smaller than the original parts. I thought Tektronix might have selected the originals for good RF performance but other than size, they are the same series of film resistors used throughout the rest of the oscilloscope and a transient response test showed that the new physically smaller replacements worked fine.

I did not check it before since I did not have more than one resistor to select from but the Dale MFF series datasheet says "very good high frequency characteristics" for whatever that is worth:

http://www.33audio.com/enter/data/DaleFilmpart2.pdf
These are the resistors you used in your scope? I'll add these to my notes to consider later when I finally get back to working on the 2213s.

Re: Viable alternative to Yahoo

 

On Mon, 25 Jan 2016 21:05:28 -0500, you wrote:

On 24/01/2016 3:46 PM, David @DWH [TekScopes] wrote:

I am not surprised the web interface has issues. I sometimes check to
see if email post are congruent with what is shown through the web
interface. I regret not having a viable alternative to Yahoo.
I've seen comments like this a few times in my short tenure here. How
serious is the sentiment? What would be the preferred format: e-mail
list or website forum?

I have the facilities to effect this, if it is actually a serious desire.
I doubt anybody is going to pay for it except voluntarily.

It would not be a replacement unless it support both email and web
access. Personally I have no idea how people put up with web access
to technical discussion forums but it is a good feature to have for
less experienced users. At the same time it is a lot less convenient
and useful than a simple email list server.

Re: Tek 2215

 

On Mon, 25 Jan 2016 01:36:53 -0600 (CST), you wrote:

On Mon, 25 Jan 2016, David @DWH [TekScopes] wrote:

There was another resistor change Tektronix made and I think it was for
reliability. The 2213 and 2215 use two 1/2 watt 1% metal film resistors
in series for the collector loads at the output of the vertical
amplifier. These resistors run hot making them unreliable and were the
first 2213/2215 repair that I made and I know of two other instances
where they had to be replaced. The later models used 3 resistors in
series for each collector load to distribute the heat better.

The collector load resistors are not difficult to replace so I would
change them also.
Are those the 4 resistors mounted to the board plus the two inline with V+
and V- on the left side of the board in this photo? One of my scopes has
one carbon comp and one carbon film for the two inline resistors. I'm
planning to replace the two inline resistors with Vishay CCF6015R0FKE36
and the 18K R877 with a Vishay CCF0718K0GKE36. I hadn't planned to replace
the 4 resistors on the board, but they look like they might be 1W parts.
I've seen photos of these boards where the board is discolored badly from
heat around those 4 resistors.

http://strudel.ignorelist.com/~tothwolf/photos/Tektronix_2213/Tektronix_2213_3/1600/IMG_9288.1600.jpg
Sorry for taking so long to respond. Those are the ones.

The parts list says they are 1/2 watt 1% film 340 ohm resistors (and
metal film based on the part number) and since there was only one
modern choice matching that available, I was not picky. I bought 10
from Mouser, replaced the 4, and left the remaining 6 inside a bag
taped to the inside of the chassis with a note.

The originals in my case were visibly discolored and cracked and once
removed, their coating flaked off. I was able to replace them without
removing the CRT using needle nose pliers. The original parts were
spaced above the printed circuit board so I used the shaft from a
Q-tip as a temporary spacer during installation.

The replacements were physically smaller than the original parts. I
thought Tektronix might have selected the originals for good RF
performance but other than size, they are the same series of film
resistors used throughout the rest of the oscilloscope and a transient
response test showed that the new physically smaller replacements
worked fine.

I did not check it before since I did not have more than one resistor
to select from but the Dale MFF series datasheet says "very good high
frequency characteristics" for whatever that is worth:

http://www.33audio.com/enter/data/DaleFilmpart2.pdf

Viable alternative to Yahoo

Torch Fireman
 

On 24/01/2016 3:46 PM, David @DWH [TekScopes] wrote:

I am not surprised the web interface has issues. I sometimes check to
see if email post are congruent with what is shown through the web
interface. I regret not having a viable alternative to Yahoo.
I've seen comments like this a few times in my short tenure here. How serious is the sentiment? What would be the preferred format: e-mail list or website forum?

I have the facilities to effect this, if it is actually a serious desire.

Sold! Two AM 503 CP Amps for parts or refurb

Bill (Doc) Courtright
 

AM503's sold. Thanks to those interested.


Hello,
I am trying to clean house a bit here. I have two AM 503 Current probe amps that are complete except for one latch but both have a smoke film mainly on one side due to a smoky fire elsewhere in my former storage area.
One is SN B031467 with a tan board and some leaky caps the other is B064903 newer with a green coat board and is clean on the component side. This one should be salvageable.
I would like $20 plus shipping for the pair. Due to their condition I would rather not put up on the auction site. Can e-mail pix on request.
Thanks,
Bill
KB3DKS

Re: Hello from new member w 2465A issues

Armin Schon
 

Thanks, will get me some of those then.

Re: Hello from new member w 2465A issues

Armin Schon
 

Opened the scope in the meantime and those are the ones, exactly. I guess they can be replaced by other types, don't have to be paper caps, or do they?

Re: 2247A 2252 Timer Counter Reference

 

After several failed attempts to put the following reply in the thread "2247A 2252 Timer Counter Reference" I'm trying via the general "Conversations" page. Previous attempts landed in the "C: Lot of 5 Tek 453's" thread.

My apologies if this doesn't work either.

It's been a while and I didn't take notes but I remember that I could see that the phase info (U1902 PFC, pin 23) was dead (steady state). Of course, I first looked at TC1 (pin 1) and VCO (pin 26) and found both alive and well, so the X-tal oscillator and U1904D (level shifter) couldn't be the problem. Partly just for confirmation of my conclusion, I decided to just cut pin 23 (PFC) and put in one gate of a socketed 'LS86 between pins 1, 26 (inputs), and 23 (output). Works a treat! As said, a bit rough but accurate and stable. I think that i didn't even put in a pull-up resistor at pin 23, which strictly speaking shouldn't be necessary but may improve shape and level. Of course, a bit of HF jitter does no harm in this application and is actually inserted through pin 22 (Noise).

Raymond

Re: help wanted ..console port or service port for TDSxxx

David DiGiacomo
 

On Mon, Jan 25, 2016 at 3:54 PM, <bddicch@...> wrote:

Hello can someone help me out and tell me how to connect to the console port from my tds scope.
it is the 2x10 edge connector on the processor PCB.


building an adapter to connect the RS232/Centronics board (option 13) to that connector. required pin assigment is:

Console port -Opt Board - Signal Name
A10 - 1 (D24)
B10 - 3 (D25)
A9 - 5 (D26)
B9 - 7 (D27)
B8 - 2 (D28)
A7 - 4 (D29)
B7 - 6 (D30)
A6 - 8 (D31)

B1 - 21 (A1)
A1 - 23 (A2)
B2 - 25 (A3)
A2 - 22 (A4)
+5V 24 (A5)
GND 26 (A6)

B5 - 12 (INT#)
B4 - 15 (IOCS#)
A5 - 16 (SYSRESET#)
A4 - 17 (RNW)
+5V - 18
+5V - 11

A8 GND
B6 +5V


but these are the pins from the console port connector. My question howto connect to this port to my laptop and open a terminal console over the RS232 port.

The option 13 board has a DB9M connector on it:
http://www.qservice.tv/vpasp/shopexd.asp?id=8987

You just hook up a DB9F to DB9F serial cable between the board and the
laptop's serial port: http://www.monoprice.com/product?p_id=448

Re: OT: QService components

Brad Thompson <brad.thompson@...>
 

On 1/25/2016 3:06 PM, 'Dennis Tillman' @Dennis_Tillman_W7PF [TekScopes] wrote:

Hi Malcom,
I have bought from them several times and never encountered a tobacco smell.
I would have remembered if I had, since I have been a non-smoker all my
life. My dad was a lifelong cigar smoker and I can't stand the smell of
cigars to this day. Apparently we have a lot of non-smokers in the forum
judging from the comments I am seeing.
<snip>

Hello--

Back in the late 1980s, I served as a technical editor for Test & Measurement World magazine
which shared open-office space with EDN magazine, both Cahners publications at that time.
Cahners had an explicit "smoking allowed" policy, and a certain EDN editor smoked cigars.

As a nonsmoker I recall asking, on several occasions, "Is that a good cigar, or do I smell a transformer fire?"

It was unclear whether the editor in question was Not Amused, but he couldn't fire me<g>.

(Come to think of it, a transformer fire smells better than a cigar....)

73--

Brad AA1IP

help wanted ..console port or service port for TDSxxx

bddicch
 

Hello can someone help me out and tell me how to connect to the console port from my tds scope.
it is the 2x10 edge connector on the processor PCB.


building an adapter to connect the RS232/Centronics board (option 13) to that connector. required pin assigment is:

Console port -Opt Board - Signal Name
A10 - 1 (D24)
B10 - 3 (D25)
A9 - 5 (D26)
B9 - 7 (D27)
B8 - 2 (D28)
A7 - 4 (D29)
B7 - 6 (D30)
A6 - 8 (D31)

B1 - 21 (A1)
A1 - 23 (A2)
B2 - 25 (A3)
A2 - 22 (A4)
+5V 24 (A5)
GND 26 (A6)

B5 - 12 (INT#)
B4 - 15 (IOCS#)
A5 - 16 (SYSRESET#)
A4 - 17 (RNW)
+5V - 18
+5V - 11

A8 GND
B6 +5V


but these are the pins from the console port connector. My question howto connect to this port to my laptop and open a terminal console over the RS232 port.


any body can help me out and give more info?

Re: 7603 weirdo inverted Z axis

 

I checked it again and the voltage was low because the sweep was set
to 50ns/div where the beam is blanked for a significant amount of
time. At most sweep speeds, the maximum voltage was about 75 volts
and at the slowest sweep speeds where the Intensity Limit is
activated, the voltage was about 50 volts.

On 25 Jan 2016 07:39:37 -0800, you wrote:

Hi David,

From 15 V to 28 V seems a rather small change compared to the data in the calibration section. Maybe you set the time base for a slow speed that activates the Intensity Limit?
Albert

============

With Q1107 (a slow 2N3904???) removed on my 7603, the output at point
B is 14.8 volts which closely agrees with our current calculation so I
wonder if Marian's <public@... mailto:public@...> measurement of 20 volts at the
output of the z-axis amplifier is significant and indicates a problem.
I get the same 14.8 volt output with Q1107 installed, the readout off,
and the intensity control turned to minimum.

I also measured the output at point B and as the intensity control is
turned fully clockwise, the output increases to about 28 volts
monotonically.

Re: CL: Lot of 5 Tek 453's

 

Sorry, I give up. No use fighting against a Yahoo.

Raymond

Re: CL: Lot of 5 Tek 453's

 

And again, it lands here! It should be in the "2247A 2252 Timer Counter Reference" thread!

Raymond

Re: CL: Lot of 5 Tek 453's

 

It's been a while and I didn't take notes but I remember that I could see that the phase info (U1902 PFC, pin 23) was dead (steady state). Of course, I first looked at TC1 (pin 1) and VCO (pin 26) and found both alive and well, so the X-tal oscillator and U1904D (level shifter) couldn't be the problem. Partly just for confirmation of my conclusion, I decided to just cut pin 23 (PFC) and put in one gate of a socketed 'LS86 between pins 1, 26 (inputs), and 23 (output). Works a treat! As said, a bit rough but accurate and stable. I think that i didn't even put in a pull-up resistor at pin 23, which strictly speaking shouldn't be necessary but may improve shape and level. Of course, a bit of HF jitter does no harm in this application and is actually inserted through pin 22 (Noise).

Raymond

Re: CL: Lot of 5 Tek 453's

 

What? This post ended up in the wrong thread! Sorry about that, please ignore!

Raymond