2445/2465 Input attenuators
Hello all: These models are very similar exept for the bandwidth, 150/350..400 MHz \.
Are the input attenuators the same?
119-2342-09, 119-2342-10,
119-2342-01, 119-2342-05
119-1445-04 119-1445-05
The suffex 01/02/04/05/09/10 are relating to CH odd = CH1 even = CH2
Production variations, and interchangable....
I think they use the same Hybrid Attenuator Chip H2159 TEK part 300-2159-01
Many thanks!
Jon
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Re: 2465B Input attenuator
ISTR that on the 24xx series 'scopes that you can use the Ch2 attenuator for Ch1 by rerouting the cables that drive the relays (and vice-versa).
Apologies if I got that wrong...
David
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Hello all, am working on late SN 2465 B, for museum ( non-profit ) use.
has a Blown CH 1 Input attenuator, the ceramic hybrid is broken in pieces.
Need a CH 1 Input attenuator TEK part 119-2342-09,
OR the set of both CH1 and CH 2 119-2342-09, 119-2342-10,
I think that the earlier suffix ODD number CH1 can work:
119-2342-01, 119-2342-05,etc.
Alternative is replace the ceramic , TEK part 300-2159-01, input attn. Hybrid Attenuator Chip H2159
The usual sources do not have any CH1.
Perhaps someone has parted out a 2465/A/B or 2467/A/B?
Am open to any reasonable offer or a swap¡.
Can ship via post to USA or EU¡.
Please me contact via PM.
Many thanks
Have an absolutely fantastic day!
Jon
ARCSI.FR
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WR-90 TO WR-112 waveguide transition, WR-90 ell WR-90 1.75 long straight
Do these get much use anywhere but radar design?
Should they just be melted down?
Available for $8 + $8 shipping (US) for all three, with screws, nuts.
WR-90 TO WR-112 waveguide transition is alum by Turbo machine co.
other 2 are 2 lbs of silver plated brass by GE.
Ships from Albuquerque NM US
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Re: Tektronix 577 Fraud Kleinanzeigen Germany
Same scams on Craigs List (USA) leBon Coin (France) Ebay, so called "social media"
if it looks too good a deal its a fraude.
The Chinese and other get better with AI ads.
Finally 577 576, and large MF scopes like 7000 TEK never survive well in shipping.
We stop fraude... NO SHIPPING meet in person
j
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Re: Tektronix 577 Fraud Kleinanzeigen Germany
Yeah, I think I found the site and the current seller is called Mina.
The seller has a lot of furniture and a lot of test equipment.
?
To me it looks like a typical scammer.? They build a list of higher end items, which are usually unrelated.
They keep putting their list on to sites that they have obtained some user passwords.
?
I see it on ebay all the time.? They will be selling an expensive electric piano, HP 3458A, Spectrum analyzer, electric bike, etc.
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Re: Tek 7904 HV transformer T1310 part 120-0742-00 insulation burning
We used Dolph electrical varnish, heat cure.
The silocones are not reccomended for transformer impregnation as air voids can form.
The wdg lay is optimized if perfect lay, L>R rather then cris cross.
Jon
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Re: Tek 7904 HV transformer T1310 part 120-0742-00 insulation burning
The HV transformers that I have built, I have sealed under vacuum with silgard 184 or Dow RTV 615. Note that in high frequency switch mode transformers, winding direction is important. I have on a back shelf several 1400 turn secondaries that were accidentally wound backward.
Hugh Gilbert
The drawing is very helpful - but one thing it doesn't mention is
whether or not the HV 1500V winding has any special construction
(since there's quite a potential difference between the ends of this
winding).? Sometimes I've seen multiple layers with insulation between
layers for the same winding (or even split bobbins, which this clearly
isn't).? I guess I can work some of this out as I dismantle!
I've got a vacuum impregnation rig as it happens - mostly used for
bearings and only down to roughing pump pressures maybe 10^-2 torr but
I guess with a clean it can be repurposed for varnish.
Alan
On Fri, 18 Oct 2024 at 18:33, Froggie the Gremlin via
<jonpaul=[email protected]> wrote:
>
> Jared, Kapton is very bad to work with as it tears easily when cutting to fit botbbin.
>
> Most HV trsf use Mylar tape like 3M56 (yellow)
>
> The wire depends on the original design, usually we use Solderable Nylease, Solderease double or triple build.
>
> See Belden Wire and MWS for suppliers. The transformers require vacuum varnis impregnation to survive at the 20..100 kHz frequencies and many kV stress.
>
>
>
> See? threads on both Tekscopes2 and Tekscopes about TEK HV transformers rebuild and insulation.
>
>
> Chuck Harris has a lot of tips and experience with the 454, 465, 475 and 2465 HV trsf.
>
>
>
> Same techniques apply to the 7904.
>
> Bon chance
> Jon
>
>
>
>
>
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Re: Tek 7904 HV transformer T1310 part 120-0742-00 insulation burning
The drawing is very helpful - but one thing it doesn't mention is whether or not the HV 1500V winding has any special construction (since there's quite a potential difference between the ends of this winding). Sometimes I've seen multiple layers with insulation between layers for the same winding (or even split bobbins, which this clearly isn't). I guess I can work some of this out as I dismantle! I've got a vacuum impregnation rig as it happens - mostly used for bearings and only down to roughing pump pressures maybe 10^-2 torr but I guess with a clean it can be repurposed for varnish. Alan On Fri, 18 Oct 2024 at 18:33, Froggie the Gremlin via groups.io <jonpaul@...> wrote:
Jared, Kapton is very bad to work with as it tears easily when cutting to fit botbbin.
Most HV trsf use Mylar tape like 3M56 (yellow)
The wire depends on the original design, usually we use Solderable Nylease, Solderease double or triple build.
See Belden Wire and MWS for suppliers. The transformers require vacuum varnis impregnation to survive at the 20..100 kHz frequencies and many kV stress.
See threads on both Tekscopes2 and Tekscopes about TEK HV transformers rebuild and insulation.
Chuck Harris has a lot of tips and experience with the 454, 465, 475 and 2465 HV trsf.
Same techniques apply to the 7904.
Bon chance
Jon
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Re: Tek 7904 HV transformer T1310 part 120-0742-00 insulation burning
Jared, Kapton is very bad to work with as it tears easily when cutting to fit botbbin.
Most HV trsf use Mylar tape like 3M56 (yellow)
The wire depends on the original design, usually we use Solderable Nylease, Solderease double or triple build.
See Belden Wire and MWS for suppliers. The transformers require vacuum varnis impregnation to survive at the 20..100 kHz frequencies and many kV stress.
See threads on both Tekscopes2 and Tekscopes about TEK HV transformers rebuild and insulation.
Chuck Harris has a lot of tips and experience with the 454, 465, 475 and 2465 HV trsf.
Same techniques apply to the 7904.
Bon chance
Jon
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Re: Tek 7904 HV transformer T1310 part 120-0742-00 insulation burning
Can you use Kapton tape instead of paper?
?
?
Jared.
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Re: Tek 7904 HV transformer T1310 part 120-0742-00 insulation burning
Here is a link to the service manual:
?
?
The insulation paper should be extremely thin (low weightage-as in paper product language). You can try a motor or transformer winding shop where they might spare you some. When I was a little kid, I once cracked open an ignition coil from an old car. It was filled with transformer oil and the secondary was wound with something like SWG40+ wire. I cannot remember now but it was very thin. You can get the wire on eBay most likely.
Having said all this, I do not know how you can make the windings due to the wire size! It will break very easily. If you have to insulate every layer, you will have a problem if you don't get the thinnest possible insulation paper. If it is once in several layers, you might be able to do it. Study the winding info page and plan it ahead. Good luck!
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Tek 7904 HV transformer T1310 part 120-0742-00 insulation burning
Hi,
My 7904 HV transformer in the PSU is giving trouble. There has been
corona type discharge from LV secondary windings and on taking it out
the transformer paper is burnt away in places.
I guess it needs replacing / rewinding. I've rewound simple
transformers with E-I laminations /motors / voice coilds before using
a Heath robinson contrivance on an old plain lathe. But this one does
not look simple and I found it hard to get elephantide type
transformer paper in small quantities (not whole rolls weighing tons).
Does anyone have any pointers / suggestions starting with really basic
stuff like how to dismantle the core without damage?
Alan Bain
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Re: Tektronix 577 curve tracer not working properly
The 2n5566 jfet was not working properly, the part listed as Q604A in the 177 schematics .
I¡¯ll try to change that one and see if the problem will solve.
Do you think that this faulty jfet could be the only cause?
?
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Re: Tektronix 577 curve tracer not working properly
Thanks for your reply, the calibration and the relative adjustments were done when I brought the tracer home a month ago and it passed all of them.
Now the traces are 2 vertical division in the 10 mA, 1A and similar ranges , close to 2 ?vert/div when set to 20mA, 2 mA and similar, a dot finally appears when in 50 mA and so on, in the uA and lower ranges turns as the 10 mA range, with collector 0% and the selection lever centered.
Thanks again guys for helping me out
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Re: Tektronix 577 curve tracer not working properly
One thing to note that is really important on the 577/177 is there is a calibration routine for the 177. This needs to be completed FIRST before the frame (577) calibration will converge. If you are seeing really weird things This could mean that the calibration is out of alignment. ? In terms of the concave ness of the trace when pushing the 577 to its most sensitive current settings looping capacitance becomes a huge struggle. Especially at the nA ranges. The reading is taken on an ¡°average¡± line through the looping trace. So this might be normal might not. ? Also check the 22 Ohm resisters in the 177. These can be abused and might be burned out or over heated. They are critically important in the vertical amp path as these are what enables kelvin sencing (4 wire) measurements in the 177. They are also in used when 2 wire measurements are being made If I recall correctly though it has been a while since I did that calibrations in my units. ? Zen ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Marco Lazzarato via groups.io
Sent: Sunday, October 13, 2024 6:18 AM
To: [email protected]
Subject: Re: [TekScopes2] Tektronix 577 curve tracer not working properly? I have a major update, today when i switch throught all the minor vertical/div settings the yellow light of overrange doesn¡¯t light up, when switching by the 50 to 20 and 10 mA i¡¯ve noticed a lot of noise on the trace, on the 5 (50 mA , 5mA and so on) scale seems better while the noise gets higher reaching the 1 (10mA,1 mA) scale, it gets so bad that the trace becomes a concave curve.Reaching the uA and nA side you can see a part of a vertical trace appear on the very top of the screen.
Seems that changing the Max peak or the series resistors doesn¡¯t affect it.
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Re: Tektronix 577 curve tracer not working properly
On Sun, Oct 13, 2024 at 11:07 AM, Dave Voorhis wrote:
I have two 577s and haven't seen your problem, and changing the intensity pot itself almost certainly had nothing to do with the problem. It sounds more like there's been some reassembly blunder or an unrelated fault. Have you tried cleaning the switch and mainframe connector contacts on your 177?
Mine tend to get noisy after not being used for a while, and that might contribute to an out-of-range condition.
If not, you'll need to debug it per the service manual circuit description, etc.
On Sat, 12 Oct 2024, 22:24 Marco Lazzarato via , <lazza2012= [email protected]> wrote:
The curve tracer was fully operational,i ran through the whole calibration/adjustment steps when i brought it home, than i realized that when I tried to set the intensity the pot was moving but in a weird way, some days passed and then i¡¯ve changed it with a new one.
Now it works ok if i set the vertical/div in the mA or upper ranges, but when i turn the knob over lower ranges the yellow light ?of the overrange turns on, and the beam goes out of range, i¡¯ve tried to test some of the resistors of the 177 and they¡¯re pretty much in spec.?
I can¡¯t figure out the cause¡
Thanks again for your reply.
?
Thanks Dave, i¡¯ve tried but i think that something inside the preamp circuit or the amp itself isn¡¯t working properly.
If you have any idea, let me know¡?
Marco
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Re: Tektronix 577 curve tracer not working properly
I have a major update, today when i switch throught all the minor vertical/div settings the yellow light of overrange doesn¡¯t light up, when switching by the 50 to 20 and 10 mA i¡¯ve noticed a lot of noise on the trace, on the 5 (50 mA , 5mA and so on) scale seems better while the noise gets higher reaching the 1 (10mA,1 mA) scale, it gets so bad that the trace becomes a concave curve.Reaching the uA and nA side you can see a part of a vertical trace appear on the very top of the screen.
Seems that changing the Max peak or the series resistors doesn¡¯t affect it.
Thanks you guys
|
Re: Tektronix 577 curve tracer not working properly
I have two 577s and haven't seen your problem, and changing the intensity pot itself almost certainly had nothing to do with the problem. It sounds more like there's been some reassembly blunder or an unrelated fault. Have you tried cleaning the switch and mainframe connector contacts on your 177?
Mine tend to get noisy after not being used for a while, and that might contribute to an out-of-range condition.
If not, you'll need to debug it per the service manual circuit description, etc.
On Sat, 12 Oct 2024, 22:24 Marco Lazzarato via , <lazza2012= [email protected]> wrote: The curve tracer was fully operational,i ran through the whole calibration/adjustment steps when i brought it home, than i realized that when I tried to set the intensity the pot was moving but in a weird way, some days passed and then i¡¯ve changed it with a new one.
Now it works ok if i set the vertical/div in the mA or upper ranges, but when i turn the knob over lower ranges the yellow light ?of the overrange turns on, and the beam goes out of range, i¡¯ve tried to test some of the resistors of the 177 and they¡¯re pretty much in spec.?
I can¡¯t figure out the cause¡
Thanks again for your reply.
?
?
|
Re: Tektronix 577 curve tracer not working properly
The curve tracer was fully operational,i ran through the whole calibration/adjustment steps when i brought it home, than i realized that when I tried to set the intensity the pot was moving but in a weird way, some days passed and then i¡¯ve changed it with a new one.
Now it works ok if i set the vertical/div in the mA or upper ranges, but when i turn the knob over lower ranges the yellow light ?of the overrange turns on, and the beam goes out of range, i¡¯ve tried to test some of the resistors of the 177 and they¡¯re pretty much in spec.?
I can¡¯t figure out the cause¡
Thanks again for your reply.
?
?
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Froggie the Gremlin
David C. Partridge
Jared Cabot