Date   

Re: dso scope recommendations

Dieter Teuchert
 

Hi,
a year ago i won a 9314 LeCroy Scope at ebay.com. It had some knobs missing and a burnt resistor in the power supply and came DOA for US $ 400 plus shipping. It has 300 MHz bandwidth on four channels and 10K points per channel.

A very nice machine with lots of features, like complete statistical data collection and analysis. My scope saves screens as TIFF files on a PCMCIA SRAM card. Have rarely used any other scope ever since.

If you can afford a 9314A or 9314C, even better. Its processors are faster. Sometimes you will also see models like 9314AM and 9314AL, which have longer trace memories. Sometimes these scopes come with even more software option packs supporting advanced signal analysis like FFT ... LeCroy calls those packages WP01 and WP02.

Regards,
Dieter Teuchert

Bob Japundza wrote:

Hi All,

I'm a lurker on this list having owned a Tek 468 for a while now. I've been needing some more advanced DSO features and am looking at some of the TDS-series scopes, keeping an eye on ebay for a good one. I'm looking to spend $500-$600. Are there any scopes in the TDS series that I should avoid?

Regards,
Bob




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--
Dipl.-Phys. Dieter Teuchert
Software und Systeme
Postanschrift:



Telefon:
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EMail pers�nlich:
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_http://www.cadt.de_


Re: TDS540 Calibration Procedure??

gettingalongwouldbenice
 

--- In TekScopes@..., "Denis Cobley" <denis.cobley@n...>
wrote:
I have some bad news then.
Without a Tek Scopecal ATE system or the software + all the required
test
equipment specified in the manual you have no chance.
Even with this you will have an uphill battle.
snipped more useful information, thanks.

Let's assume that I DO like uphill battles. Let's also assume that
I CAN get my hands on adequate test equipment. I designed pieces
of some of the TEK scope cal equipment, so I'm not totally in the dark.
If it can be approximated without the ATE system, I have a chance
of doing it.

Where might I obtain the PC software to run the cal procedure?

Is there any available documentation on what GPIB commands are
sent to put the machine into calibration mode and step thru the process?

I'd like to take a poke at it. Ain't doin' no good sittin' here
on the floor broke...

Thanks, mike

Yahoo! Groups Links







Re: 1L5 Spectrum Analyzer

Craig Sawyers <c.sawyers@...>
 

Hi Jim

I'll bet the seller said that it was in working condition when pulled from
service....

There are two identical crystals supposed to be in there - 100kHz. Tek part
number is 158-0022-00. The can is rather tall, presumably because the
crystal is physically large given the frequency - 1.5".

Good luck

Craig

-----Original Message-----
From: Jim Beacon [mailto:jim@...]
Sent: 20 August 2004 08:20
To: Tekscopes
Subject: [TekScopes] 1L5 Spectrum Analyzer


Hi,

I've just received a 1L5 from eBay. On close inspection, there
seem to be two components (crystals?) missing from the variable
resolution amp board, component references Y344 and Y325. Can
anyone confirm what, if anything, should be in these positions?

Also is there a freely dowloadable copy of the manual available anywhere?

Thanks

Jim.

Please see our website the " Vintage Communication Pages" at
WWW.G1JBG.CO.UK








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1L5 Spectrum Analyzer

jim_beacon2000
 

Hi,

I've just received a 1L5 from eBay. On close inspection, there seem to be two components (crystals?) missing from the variable resolution amp board, component references Y344 and Y325. Can anyone confirm what, if anything, should be in these positions?

Also is there a freely dowloadable copy of the manual available anywhere?

Thanks

Jim.

Please see our website the " Vintage Communication Pages" at WWW.G1JBG.CO.UK


Re: TDS540 Calibration Procedure??

Denis Cobley <denis.cobley@...>
 

I have some bad news then.
Without a Tek Scopecal ATE system or the software + all the required test
equipment specified in the manual you have no chance.
Even with this you will have an uphill battle.
The first step in all these cals is to run the SPC - if this fails it
normally will bug out of the cal process.
The SPC only does DC gains & balances/offsets - it is NOT a calibration -
that is why it's called "Signal path compensation".
If it was a self cal the Tek would have called it that (some scopes do have
that capability like the 11K series).
I have been involved in many repairs on this product with the Tek ATE which
you can force past the SPC pass requirement. In almost every case you then
end up with a power up failure and / or a Cal failure on the cal status
screen.
This is because you actually have a fault but it is more a degradation of
performance of the digitiser ASIC for a channel.
The message is "Dac Value out of bounds" which means the unit cannot get the
adjustment to pass and meet the engineering limits Tek set on the DAC number
for a particular adjustment (normally 700-4500 or similar - varies from
model to model) that is stored as the corrected value for that function.
Good luck going forward - you will need it.
As a general warning to all on the list - buying any TDS500 (or most TDS
scopes) if they show acquisition failures then you had better be prepared to
lose all your money because other than leaky caps you have a low chance of
completing a successful repair (passes all daigs and cal with a clear error
log). I would insist on a picture of the error log if I was buying to use it
as a scope (I often buy for parts).
If the error log was clear, it passed SPC and showed all passed on the cal
status then you are reasonably OK (other than it is out of support and Tek
have no parts if you could afford them)
If Tek had an exchange acquisition board it could cost about $2000+ a full
cal after fitting it.
Working TDS scopes are a great scope - faulty ones are not.
Regards
Denis Cobley
www.newteksupport.com

----- Original Message -----
From: "gettingalongwouldbenice" <gettingalongwouldbenice@...>
To: <TekScopes@...>
Sent: Friday, August 20, 2004 10:59 AM
Subject: [TekScopes] Re: TDS540 Calibration Procedure??



--- In TekScopes@..., "Denis Cobley" <denis.cobley@n...>
wrote:
Hi
SPC has to pass before you attempt any cal adjustments - if SPC
failed then
you still have a 95% chance of a hardware problem.
You seem to have a DAC problem.
snipped very helpful input.

Thanks for the suggestions. I'll go see if I can figure out
what's happening in the DAC system.

Let's look at the SPC logically. Since I don't have any real facts,
that's all I got. My understanding is that SPC can compensate
for minor temperature variations in the calibration. If it would
pass with ANY or CORRUPTED calibration data, there'd be no need to
ever (externally) calibrate the unit. It would just self-cal and meet
specs.

I propose that a badly miscalibrated unit might fail SPC???

If the calibration constants are so far out that the minor tweeking
of SPC couldn't fix it, one would need to (external) recal to get
things back into the ballpark.

Remember that I've got two acquisition boards with the same symptom
on all 8 channels. And that the boards have been swapped around and
the calibration constants blown away. The control board probably
isn't even sure whether it's a 520 or 540.

Now, if you'd said that it has to pass power on self test before
attempting calibration, I'd agree. It does pass that test.

Bottom line is that eventually I'll need to calibrate the system.
Where can I find the calibration software? I tried to look in
the tekscoparc group, but the moderator either isn't paying attention
or doesn't want me in there. :-(

I do have a working TDS540, but I'm unwilling to swap boards into there
until I have the calibration issues resolved. I already got two
bad scopes...I don't need three ;-)

Thanks, mike






Yahoo! Groups Links







WTD: TEK 7623A or 7633

w1ksz <w1ksz@...>
 

Looking for one to mate up with my 7L12.
I have a large collection of "real blue" Tek Service manuals
and NIB Tek parts. If you are interested in a trade, let me know
and I'll forward my list for you to peruse.

Regards, Dick, W1KSZ


Re: Resurrected 11402 and plug-in compatibility

Denis Cobley <denis.cobley@...>
 

Hi
The 7K units are vertical plug in 's only - no sampling, timebase or specan,
curve tracer plugs.
This is because the 11K slots are all vertical only - the timebase is
digital and will not accept any plug that produces a ramp for sweeping.
Also, you need to cut the rear plastic of the 7K unit (look at them side by
side to see the difference.
Then, when you have it in the scope you will need to select it manually as
the scope cannot "see" it.
I would just buy some more plugs on ebay.
Regards
Denis Cobley
www.newteksupport.com

----- Original Message -----
From: "madmanoneresurrected" <madmanoneresurrected@...>
To: <TekScopes@...>
Sent: Friday, August 20, 2004 10:04 AM
Subject: [TekScopes] Resurrected 11402 and plug-in compatibility


After grabing a 11401 off EBay and finding that it has 1 defective
aquisition module (U552), I saw a 11402 on EBay for a song that only
had a (e2211) Hard Keys panel error (replicated this code on the
11401) so I grabbed it off EBay and canabalized the 11401's front key
panel (which is also the touch screen matrix) for the 11402 and I now
have a fully functional 11402 w/1 - fully functional 11A71.

Now to the point of the post. It says in the diagnostics that it will
use 11k/7k plugs. My question is does anyone have a list of the
supported 7k series plugs for this unit. Also one other one that came
to mind, If it supports the 7k plugs will a 7L12, 7L13 or 7L14
Spectrum analyzer plug work in the empty space provided by the center
and right slots?.

Thanks






Yahoo! Groups Links






Re: TDS540 Calibration Procedure??

gettingalongwouldbenice
 

--- In TekScopes@..., "Denis Cobley" <denis.cobley@n...>
wrote:
Hi
SPC has to pass before you attempt any cal adjustments - if SPC
failed then
you still have a 95% chance of a hardware problem.
You seem to have a DAC problem.
snipped very helpful input.

Thanks for the suggestions. I'll go see if I can figure out
what's happening in the DAC system.

Let's look at the SPC logically. Since I don't have any real facts,
that's all I got. My understanding is that SPC can compensate
for minor temperature variations in the calibration. If it would
pass with ANY or CORRUPTED calibration data, there'd be no need to
ever (externally) calibrate the unit. It would just self-cal and meet
specs.

I propose that a badly miscalibrated unit might fail SPC???

If the calibration constants are so far out that the minor tweeking
of SPC couldn't fix it, one would need to (external) recal to get
things back into the ballpark.

Remember that I've got two acquisition boards with the same symptom
on all 8 channels. And that the boards have been swapped around and
the calibration constants blown away. The control board probably
isn't even sure whether it's a 520 or 540.

Now, if you'd said that it has to pass power on self test before
attempting calibration, I'd agree. It does pass that test.

Bottom line is that eventually I'll need to calibrate the system.
Where can I find the calibration software? I tried to look in
the tekscoparc group, but the moderator either isn't paying attention
or doesn't want me in there. :-(

I do have a working TDS540, but I'm unwilling to swap boards into there
until I have the calibration issues resolved. I already got two
bad scopes...I don't need three ;-)

Thanks, mike


TEK 485 - need help

ehsjr@...
 

Intensity way too bright & no control of it. Details below.

A while back I posted on this scope. It completely died, but I found
and fixed that problem. It was caused by a leaky .001 uf cap in the
cathode regulator. (C1611) Replaced the cap, & it powered up - but
I have no control over the intensity. It is far too bright. All voltages are ok,
and it displays the proper waveforms. With no input and no trigger,
it creates a VERY bright spot on the left of the screen. Documentation
tells me the grid is supposed to be more negative than the cathode - but
does not give me a voltage. I believe my problem is in that area, but I
don't know how to test. I have (repeatedly) tested every diode in the
grid and focus DC restorer circuits, and checked every cap for leakage.

Can I connect one lead to the cathode and the other to the grid with
an 11 meg input on my DMM, or does that load down the grid too
much ? And, if I can, how much difference should I see? My
"HV probe" is a home made ~ 100 meg string of ten 10 meg resistors.
With it, I see the same voltage on the grid or cathode with respect to
ground. Varying grid bias has no effect on the intensity, nor does
varying the intensity control change the intensity on the screen. However,
varying the intensity control does change the amplitude of the signal
at the anode of CR1660, while varying the grid bias has no effect
on that amplitude. (As seeen with a separate 475 scope.)

I'm lost. Any help would be appreciated, especially what to look for
at 1653 and TP 1665.

Thanks,
Ed


Rack mounted 453

campionrabbit <thudson@...>
 

Howdy all,

I'm new to this website so forgive me if I'm asking a question that
may have been asked before. I have a 453 that I would like to
convert into a rack mount. Does anyone know how I can do this?

Many Thanks!


Resurrected 11402 and plug-in compatibility

madmanoneresurrected <madmanoneresurrected@...>
 

After grabing a 11401 off EBay and finding that it has 1 defective
aquisition module (U552), I saw a 11402 on EBay for a song that only
had a (e2211) Hard Keys panel error (replicated this code on the
11401) so I grabbed it off EBay and canabalized the 11401's front key
panel (which is also the touch screen matrix) for the 11402 and I now
have a fully functional 11402 w/1 - fully functional 11A71.

Now to the point of the post. It says in the diagnostics that it will
use 11k/7k plugs. My question is does anyone have a list of the
supported 7k series plugs for this unit. Also one other one that came
to mind, If it supports the 7k plugs will a 7L12, 7L13 or 7L14
Spectrum analyzer plug work in the empty space provided by the center
and right slots?.

Thanks


Re: dso scope recommendations

Denis Cobley <denis.cobley@...>
 

Hi Bob
For that sort of money you could pick up a TDS400 or 300 series in good
condition.
Do you need 4 or 2 ch ?
Bandwidth / record length / sample rate ?
These will all determine which model to chose.
The TDS300 series are all 2 ch and about 1K record length but high sample
rate, bandwidths from 60MHz to 300MHz..
The TDS400 series have only 100MS/s sample speed but offer 2 or 4 ch, and
bandwidths or 100MHz to 300MHz with record lengths to 30,000 points.
Some models in each series have various comms options and some have floppy
drives.
You pick your feature and then go shopping !
Regards
Denis Cobley
www.newteksupport.com

----- Original Message -----
From: "Bob Japundza" <bjapundza@...>
To: <TekScopes@...>
Sent: Friday, August 20, 2004 4:00 AM
Subject: [TekScopes] dso scope recommendations


Hi All,

I'm a lurker on this list having owned a Tek 468 for a while now.
I've been needing some more advanced DSO features and am looking at
some of the TDS-series scopes, keeping an eye on ebay for a good
one. I'm looking to spend $500-$600. Are there any scopes in the
TDS series that I should avoid?

Regards,
Bob





Yahoo! Groups Links






Re: Tek 442 / jumpy trace on ch1

DON CRAMER <donlcramer@...>
 

I believe the 442 was a repackaged T932A using mechanical bits from the 434.

I don't know who (i.e. customer or marketing) drove it, but clearly it was attempt to provide a more conventional looking scope to the lower end of the Tek range. A slight downside is the 442 has the longer depth of the T900 series compared to the 465, et al (remember the T900 is narrow in width, so it grew in depth as compared to other 400 series portable scopes). There is probably a fair amount of open space inside the 442 as a result.

I remember the 442 being made alongside T900, but almost as a special in lower volumes. 'Special' in that my recollection was only one calibrator was assigned to it, though this may have been because it was just out of engineering at the time. The timeframe was somewhere mid 1977 to mid 1978. I note the T900 was introduced in the 1976 catalog, almost as an afterthought, so the line was quite new. I don't see the 442 listed in the 1978 catalog--my next one up is an '84--maybe someone could look in between to find when it first showed up. I'd be curious how it priced out versus the T932A and 455 for instance.

Overall, I personally like the appearance of the 442 very much--it reminds me of the later 2200 series but with more metal. I had forgotten all about it until one showed up on ebay recently, jogging my memory and my curiosity. As usual, I wish I had paid more attention to what was around me when I was there in Building 47 (alas, it is a green field now). I do still remember how wonderful it was to see all that brand new Tek hardware around--oops, there I go again.

I would guess the reliability of the 442 to be very good. The modular design scopes (my term) were a bit "plastic-y" in the controls, but otherwise built to Tek's high standards of the time. I would add the 442 to my collection if I came across a clean one.

Don C
Beaverton, OR

----- Original Message -----
...
BTW, I performed various google searches to look for any info
reg. the 442 and didn't find much. Is the 442 a very uncommon
scope? Rare? 'Bad' or inferior in some way so it wasn't very
successful on the market?

...


Re: Baking scopes?

Rasputin Novgorod <priapulus@...>
 

The Tek wash & dry makes sense.

A friend suggested to me that if you have electronics
that hasn't been powered up in a long time, and uses
high voltages, it would be wise to place a desicant
pack in that unit for at least a week before it is
used.

He felt that after several years unused, the phenolic
board has probably absorbed considerable moisture
from the air. The transistors and diodes close too
the high voltage supply don't like the leakage.

What do you think? Old wive's tail, or good idea?

Sincerely



__________________________________
Do you Yahoo!?
New and Improved Yahoo! Mail - Send 10MB messages!
http://promotions.yahoo.com/new_mail


dso scope recommendations

Bob Japundza <bjapundza@...>
 

Hi All,

I'm a lurker on this list having owned a Tek 468 for a while now.
I've been needing some more advanced DSO features and am looking at
some of the TDS-series scopes, keeping an eye on ebay for a good
one. I'm looking to spend $500-$600. Are there any scopes in the
TDS series that I should avoid?

Regards,
Bob


Tek 442 / jumpy trace on ch1

Ahlbrecht, Andreas <ahlbra@...>
 

Hello members,

I have a Tek442 oscilloscope with a strange problem.

(The Tek442 is a two channel scope / 35MHz bandwith /
single timebase / very basic scope without any fancy features)

The trace of channel 1 is very unstable. It jumps up and down,
sometimes less, so it looks as if there was some low freq. noise
on ch. 1.

At first glance I thought it might be due to some dirt in the
vert. pos. pots or vert. sens. rotary switch. But not so.
I can operate all the pots and switches without any effect on
the jumpy behavior.

OK. Then it might be a bad solder joint, loose or dirty
connector or something like that. I opened the scope, pulled
every connector within reach, inspected it for dirt or other
obvious problems(none found) and firmly reseated them back into
place.
No success.
So I powered it up and tapped on nearly everything, carefully
watching the trace. No success either. The trace keeps jumping
up and down and does in no (noticeable) way react on any tapping,
rocking or whatever mechanical 'impact'.

I have to say that the scope has been dropped by it's previous
owner, so badly that the metal front frame has cracked in the
lower right hand corner and the BNC connector of ch.1 is slightly
bent to the right. However, the internal mointing points for the
various PCBs and stuff seem not to be affected and no boards seem
to be cracked.

Everything else works just fine and ch.2 is not at all affected.
It really looks like some intermittently bad electrical contact
of some sort, somewhere. But I just can't find where.

I'm stuck, not knowing where to look at.

Any ideas, anyone?

BTW, I performed various google searches to look for any info
reg. the 442 and didn't find much. Is the 442 a very uncommon
scope? Rare? 'Bad' or inferior in some way so it wasn't very
successful on the market?

Any comments are greatly appreciated!

Best regards,
Andi


Re: TDS540 Calibration Procedure??

Denis Cobley <denis.cobley@...>
 

Hi
SPC has to pass before you attempt any cal adjustments - if SPC failed then
you still have a 95% chance of a hardware problem.
You seem to have a DAC problem.
The DAC system is located on the front section of the acquisition board -
this controls the gains and offsets for all channels (including trigger and
position levels).
This is a description based on my reverse engineering of the board so may
not be totally reliable.
Hope it helps.
DAC System

The DAC system consists of a main DAC (U900) an AD667, a number of switch IC
's and the sample & hold Op Amp's.

The DAC output is on pin 9. This goes to large number of various IC switches
in the area of the board from U900 to Ch1 input connector and behind the
Attenuator connector J1153. The DAC system uses a combination of 4051 CMOS
(8 to 1 switches), DG444 (4 x SPST CMOS switches) which demultiplex the DAC
output to DC levels for various functions (Trigger level, Vertical gain,
offset, DC balance). These outputs are fed to Sample & Hold circuits using
TL074 and other Op Amps.

A typical path is the A Trigger Level. This comes from the DAC, is
demultiplexed by a 4051 (U931 pin 3 as the input) and outputted via pin 13
to a TL074 (pin 5). This Sample and hold Op Amp outputs the Trigger Level
(+/- 700mV DC ) to the Trigger Amp (U1552 pin 16) from it's output pin 7.

The DAC system refresh rate seems to be 6.06ms.

Regards
Denis Cobley
www.newteksupport.com

----- Original Message -----
From: "gettingalongwouldbenice" <gettingalongwouldbenice@...>
To: <TekScopes@...>
Sent: Thursday, August 19, 2004 5:41 AM
Subject: [TekScopes] TDS540 Calibration Procedure??


I acquired a TDS540 and TDS520.
Previous owner tried board swap and turned off calibration RAM
protection.
I changed all the electrolytics and cleaned the boards.
Now at least three
of the 4 boards seem to be working.
But calibration is all messed up.
Passes power up self-test, but fails Signal Path compensation.
There's a slew of error messages in the logfile.
So far, I've verified that the input attenuators are working.
Beyond that, when the signal disappears into an undocumented board,
things get much harder.

The most obvious symptom is that when changing the vertical
position, the trace moves at a rate that's about twice the rate
that the (ground reference) arrow on the left edge of the screen moves.

It's the same on both acquisition boards. All channels have the
same symptom.
I'm making the rash assumption (wishful thinking) that recalibrating the
insturment will fix this.

The service manual has a lot of performance verification info, but
the actual calibration procedure goes like this, "insert the
TDS 500B and 700A Field Adjustment Software
calibration disk into your GPIB PC and follow instructions..."
Not much help.
These appear to be vanilla (not A or B) versions of the 520/540
if that matters to the calibration sw version.

Is there an available field procedure that would let me cal the
TDS540 using manually controlled sources? There's a set of "cal"
commands in the programmer's reference manual that claim to step
thru something related to calibration, but that's all I can determine.

I could borrow a NI GPIB card and run the cal sw IF I could get my
hands on it. If I needed GPIB calibration sources, I'd be hard pressed
to get my hands on that...maybe a CG551AP could be borrowed, if that
would do it.

Help!!!


One of the processor boards has an additional problem.
When it's booting, it fails to display the stairstep pattern that's
typical of the series. Then it puts up the horizontal position
indicator on the top line of the screen...looks like this:

|__________________|

Then it locks up with the two frontmost segments of the 7-segment
led flashing alternately. Swapping the ROM didn't help.
Same problem in both mainframes with either acquisition board.
Ideas on a process to determine how to fix this?

Thanks, mike








Yahoo! Groups Links






TDS540 Calibration Procedure??

gettingalongwouldbenice
 

I acquired a TDS540 and TDS520.
Previous owner tried board swap and turned off calibration RAM
protection.
I changed all the electrolytics and cleaned the boards.
Now at least three
of the 4 boards seem to be working.
But calibration is all messed up.
Passes power up self-test, but fails Signal Path compensation.
There's a slew of error messages in the logfile.
So far, I've verified that the input attenuators are working.
Beyond that, when the signal disappears into an undocumented board,
things get much harder.

The most obvious symptom is that when changing the vertical
position, the trace moves at a rate that's about twice the rate
that the (ground reference) arrow on the left edge of the screen moves.

It's the same on both acquisition boards. All channels have the
same symptom.
I'm making the rash assumption (wishful thinking) that recalibrating the insturment will fix this.

The service manual has a lot of performance verification info, but
the actual calibration procedure goes like this, "insert the
TDS 500B and 700A Field Adjustment Software
calibration disk into your GPIB PC and follow instructions..."
Not much help.
These appear to be vanilla (not A or B) versions of the 520/540
if that matters to the calibration sw version.

Is there an available field procedure that would let me cal the
TDS540 using manually controlled sources? There's a set of "cal"
commands in the programmer's reference manual that claim to step
thru something related to calibration, but that's all I can determine.

I could borrow a NI GPIB card and run the cal sw IF I could get my
hands on it. If I needed GPIB calibration sources, I'd be hard pressed
to get my hands on that...maybe a CG551AP could be borrowed, if that
would do it.

Help!!!


One of the processor boards has an additional problem.
When it's booting, it fails to display the stairstep pattern that's
typical of the series. Then it puts up the horizontal position
indicator on the top line of the screen...looks like this:

|__________________|

Then it locks up with the two frontmost segments of the 7-segment
led flashing alternately. Swapping the ROM didn't help.
Same problem in both mainframes with either acquisition board.
Ideas on a process to determine how to fix this?

Thanks, mike


Re: Need transformer for SG505, Tek PN 120-1284-00

oberusal
 

Hi,

I have done business with Multicomp for the last 15 years. They are no
longer known by that name. Now they are Zman.

This link should work: http://www.zmanmagnetics.com/

From what I remember, TEK shut down their magnetic group many years back.
The people that were in that group formed Multicomp (or something like
that).

Scott

-----Original Message-----
From: unclebilly79 [mailto:unclebilly79@...]
Sent: Tuesday, August 17, 2004 2:42 PM
To: TekScopes@...
Subject: [TekScopes] Need transformer for SG505, Tek PN 120-1284-00


I need a replacement transformer for an SG505 oscillator. It is
marked "Multicomp, Inc." and has a part number of 120-1284-00. It is
the power supply transformer (T1220).

Any ideas?





Yahoo! Groups Links


Help!! 2236 parts needed.

mervynashton <mervynashton@...>
 

Hi everybody!

I am looking for 2 Vertical attenuator knobs for the Tektronix 2236
scope, the knobs for the 2235 may be OK. Tektronix do not seem to
have any stock and it sounds as though support has been withdrawn a
while ago anyway.

Have tried the usual people such as Sphere, but no luck so far.

I am very happy to pay a fair price for these knobs, or make a
donation to the donor's favourite charity.

I hope you can help.

Best regards.
Thanks

Mervyn

186061 - 186080 of 194754