Date   

Re: PIN Diodes used in Tek products

Miguel Work
 

Which are the differences between:

Tunnel diode
Back diodes
Pin diodes
Gunn diode

:)

?

-----Mensaje original-----
De: TekScopes@groups.io [mailto:TekScopes@groups.io] En nombre de GerryR
Enviado el: miércoles, 22 de enero de 2020 19:30
Para: TekScopes@groups.io
Asunto: Re: [TekScopes] PIN Diodes used in Tek products

Gary,
Link to where on Ebay I purchased the tunnels:
https://www.ebay.com/itm/Set-10-Tektronix-152-0125-01-4-7mA-TUNNEL-DIODES-replaces-1N3717-TD-3A-Tested/312810709201?hash=item48d4f8a0d1:g:ft4AAOSwsdJdoQL0

GerryR

----- Original Message -----
From: "Greg Muir via Groups.Io" <big_sky_explorer=yahoo.com@groups.io>
To: <TekScopes@groups.io>
Sent: Wednesday, January 22, 2020 1:20 PM
Subject: Re: [TekScopes] PIN Diodes used in Tek products


Dave,

While looking at diode data for Gary I noticed that your 5082-3080 part has
a standard part number of 1N5767. This device is available.

Greg


Re: PIN Diodes used in Tek products

GerryR <totalautomation1@...>
 

----- Original Message -----
From: "Greg Muir via Groups.Io" <big_sky_explorer=yahoo.com@groups.io>
To: <TekScopes@groups.io>
Sent: Wednesday, January 22, 2020 1:20 PM
Subject: Re: [TekScopes] PIN Diodes used in Tek products


Dave,

While looking at diode data for Gary I noticed that your 5082-3080 part has a standard part number of 1N5767. This device is available.

Greg


Tel 576 relay

peter bunge
 

My tek 576 had a relay with open coil. I had one spare in my parts 576 that fixed the problem but would like to replace it.
The relays are available on Ebay as
Item 312629099480 Tektronix 148-0044-00 Relay
but shipping to Canada is $29.11 Cdn which is ridiculous. There are additional brokerage charges because of the wonderful Global shipping program that has all but killed my purchases from the USA.Shipping to the US is $4.06 US which also seems a bit high but acceptable.
Would anyone wishing a spare buy a couple more and sell them to me with reasonable shipping. It would be much appreciated.
Contact me privately to make arrangements for payment.


Re: PIN Diodes used in Tek products

GerryR <totalautomation1@...>
 

Gary,
I deleted the email where you posted the part number you are trying to find, but I have a few 152-0125-01, 4.7 ma. tunnels; they are replacements for 1N3717 and TD-3A, I am told. I used them for a pulser I made, and they worked fine for my application. If they can help you, let me know.
Best regards,
GerryR
KK4GER

----- Original Message -----
From: "Greg Muir via Groups.Io" <big_sky_explorer=yahoo.com@groups.io>
To: <TekScopes@groups.io>
Sent: Wednesday, January 22, 2020 1:04 PM
Subject: Re: [TekScopes] PIN Diodes used in Tek products


Gary,

You might look at the Microchip/Microsemi GC4410-115-2 or UM7301B to see if they come close to what you could use. But be prepared to hand over some cash.

Greg


Re: PIN Diodes used in Tek products

Greg Muir
 

Dave,

While looking at diode data for Gary I noticed that your 5082-3080 part has a standard part number of 1N5767. This device is available.

Greg


Re: PIN Diodes used in Tek products

Greg Muir
 

Gary,

You might look at the Microchip/Microsemi GC4410-115-2 or UM7301B to see if they come close to what you could use. But be prepared to hand over some cash.

Greg


Re: Designing a new TM500 storage box

David DiGiacomo
 

On Tue, Jan 21, 2020 at 11:14 PM Magic_Smoke <@magicsmoke> wrote:

Thanks David, this is exactly the kind of feedback I need. How do you feel about a big open-top drawer?
A simple drawer plugin would be OK for a mainframe that was staying in
one spot on the bench, but not so great for one that was moved around.
Small parts would migrate over the drawer sides and get lost in the
mainframe. It also wouldn't solve the problem of having to unlatch
and pull out the drawer to use it.

A drawer inside an enclosed box plugin might work well, if the drawer
didn't end up being too small.


5111 Storage Scope Loss of -30VDC

Bob Wilson
 

A friend gave me this one saying it had never been used. It still had the little paper stuck on the CRT saying how to power it up if it had been off for over a month.
But of course it did not work correctly only having a small dot on the CRT that bounced around.
I eventually found -30 VDC was missing and replaced a shorted 1uf tantlum cap on the storage board. But still no -30VDC.
If I disconnect the -30 VDC wire going to the storage board the voltage comes up. So either the supply is weak or something on that board is pulling the voltage down.
In testing the transistors on the storage board I find some kind of stuff in the socket holes. Maybe thermal compound, I don't know. But now its hard and makes getting the transistor lead difficult to reinsert back into the socket. The TO39 transistor all check good but I have not gone throught the TO99 transistors yet.
Any suggestions would be appreciated.


Re: Damaged 606

 

Hi:
Check first , my 606B also had the problems, even the small value E-Cap !
Rd
Tony C

從我的iPhone傳送

Stephen Hanselman <kc4sw.io@...>於2020年1月22日 15:29寫道:

Check the AC on those PS, we see these go bad often

Regards,

Stephen Hanselman
Datagate Systems, LLC
On Jan 21, 2020, at 22:47, Lars Brinkhoff <lars@...> wrote:

satbeginner wrote:
Looks as damage to the internal electron gun supports, CRT is toast :-(
Thank you, that makes sense.

I measured the outputs from the low voltate power supplies. Some are of
out of spec, especially -30V. But I'm not sure that would explain the
problem.

-30V is -17.1 (should be at least -29.1)
+15V is +14.9 (ok)
+30V is +27.5 (ok)
+120V is +100.8 (should be +108)
+270V is +261.7 (close, at least +262)




Re: 7A26 transient response 5 nS all atten

Colin Herbert
 

I think I am remembering correctly when I say that Tektronix recommended the use of IPA (isopropyl alcohol, isopropanol, propan-2-ol) because many other cleaning agents could damage the substrate of the attenuator boards. The boards are made from polyphenylene oxide. On P.41 of my Service manual (Rev. May 1974) on cleaning, it reads:

"Avoid the use of chemical cleaning agents which might damage the plastics used in this instrument. Special care should be taken when cleaning the Polyphenylene Oxide attenuator boards. Do not apply any solvent containing ketones, esters or halogenated hydrocarbons. To clean, use only water soluble detergents, ethyl, methyl or isopropyl alcohol."

I hope that clarifies the situation sufficiently. It would be a great shame for someone to ruin a fine instrument by employing the wrong solvent to clean the contacts on the attenuators.

Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dennis Tillman W7PF
Sent: 22 January 2020 00:20
To: TekScopes@groups.io
Subject: Re: [TekScopes] 7A26 transient response 5 nS all atten

I believe the service manuals mention what is safest to use to clean the contact fingers. They are delicate so be very careful. I use IPA soaked into thin cardboard. Others believe that DeOxit is good. It used to be called Cramolin 30 years ago. Still others use a shot of contact cleaner but that will eventually (many years from now) leave a residue behind that may harden.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Albert Otten
Sent: Monday, January 20, 2020 1:00 PM
Subject: Re: [TekScopes] 7A26 transient response 5 nS all atten

Hello Jon,

I don't have much experience with cleaning those attenuators. I think I used a squirt of Ipa when there was no access with a soaked strip of postcart.
In an old message here I saw a link to
https://www.eevblog.com/forum/reviews/tektronix-r7103-scope-teardown/ .
Scroll down to dismantled 7A26. Looks interesting at first sight, didn't read it in detail.

Albert




--
Dennis Tillman W7PF
TekScopes Moderator


Re: 2465B - Weak Readout Intensity

 

If anyone needs a jug for a 2465B I have one here in Kenilworth, UK. It had good intensity when I removed it from a 2430A with bad CCDs.

Postage to US may be prohibitive tho'

D.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of satbeginner
Sent: 22 January 2020 07:58
To: TekScopes@groups.io
Subject: Re: [TekScopes] 2465B - Weak Readout Intensity

Just a thought: if you tweak the Grid Bias setting on the side, do you see any change in intensity?


Re: What Tektronix means to me

Dave Seiter
 

Grin! The trick is knowing where to stop (bathrooms come to mind!)
-Dave

On Tuesday, January 21, 2020, 10:30:06 PM PST, Magic_Smoke <@magicsmoke> wrote:
 I am slowly furnishing my house with it.


Re: What Tektronix means to me

Tam Hanna
 

Hello Dennis,
Sorry for my short response - I am running a severe fever, but must keep working due to a staff shortage both in my firm and at some suppliers.

I have a very ambivalent relationship to all things software: well, in today's world, you can not do engineering without. But I do prefer the hardware engineering at least to some extent.

Of course, this is the route to ruin. From a hardware level, the Danaher TriStar architecture was superior to LeCroys 9300 platform. But LeCroys decision to invest into software (and to avoid Smalltalk and Java muppetry and work with C instead) turned the market to their favor. Rest is history...


---
With best regards
Tam HANNA (emailing on a BlackBerry PRIV)

Enjoy electronics? Join 14k other followers by visiting the Crazy Electronics Lab at https://www.instagram.com/tam.hanna/


Re: 2465B - Weak Readout Intensity

satbeginner
 

Just a thought: if you tweak the Grid Bias setting on the side, do you see any change in intensity?


Re: Damaged 606

Roger Evans
 

Before you give up all hope, check for very large values of ripple on the -30V and +120V supplies. The bulk smoothing capacitors can go low capacitance / high ESR with age and you get almost 100% modulation of the raw DC into the low voltage regulator. As a quick fix you can just tack on an external capacitor in parallel, even on long leads, to see if the distorted trace returns to something more nearly normal.

The -30V biasses the X and Y amplifiers and if it goes way out of spec twice every mains cycle you will see the spot trace out a possibly complex shape as the amplifier operating point changes. I saw something similar on a 475 with three power rails showing large ripple and the timebase not working due to an open circuit switching transistor.

Roger


Re: Damaged 606

 

Always get the power supplies working first. Looks like you need to replace some electrolytics.

On 1/22/2020 1:47 AM, Lars Brinkhoff wrote:
satbeginner wrote:
Looks as damage to the internal electron gun supports, CRT is toast :-(
Thank you, that makes sense.

I measured the outputs from the low voltate power supplies. Some are of
out of spec, especially -30V. But I'm not sure that would explain the
problem.

-30V is -17.1 (should be at least -29.1)
+15V is +14.9 (ok)
+30V is +27.5 (ok)
+120V is +100.8 (should be +108)
+270V is +261.7 (close, at least +262)


Re: Damaged 606

Stephen Hanselman
 

Check the AC on those PS, we see these go bad often

Regards,

Stephen Hanselman
Datagate Systems, LLC

On Jan 21, 2020, at 22:47, Lars Brinkhoff <lars@...> wrote:

satbeginner wrote:
Looks as damage to the internal electron gun supports, CRT is toast :-(
Thank you, that makes sense.

I measured the outputs from the low voltate power supplies. Some are of
out of spec, especially -30V. But I'm not sure that would explain the
problem.

-30V is -17.1 (should be at least -29.1)
+15V is +14.9 (ok)
+30V is +27.5 (ok)
+120V is +100.8 (should be +108)
+270V is +261.7 (close, at least +262)



Re: Damaged 606

Lars Brinkhoff
 

satbeginner wrote:
Looks as damage to the internal electron gun supports, CRT is toast :-(
Thank you, that makes sense.

I measured the outputs from the low voltate power supplies. Some are of
out of spec, especially -30V. But I'm not sure that would explain the
problem.

-30V is -17.1 (should be at least -29.1)
+15V is +14.9 (ok)
+30V is +27.5 (ok)
+120V is +100.8 (should be +108)
+270V is +261.7 (close, at least +262)


Re: What Tektronix means to me

Magic_Smoke
 

I'm very new to the Tektronix world by comparison to a lot of the sages here. I suspect the first scope I used was a 2400 series in high school or college in the early 2000's, and the first one I owned was a TDS3052 in 2018! Oscilloscopes have always been a favorite tool of mine, and I feel very lucky to be living so close to the Vintage Tek Museum and Tek HQ (only half a mile from my house!) which has allowed me to start building the little shop I've always wanted at home. I have always admired Tek scopes, but my more recent interest in Tek hardware and history comes from exposure to this community, both online and in Beaverton. It is nice to think that the enthusiasts from across the world have put together the forums, wiki, and museum, and those central hubs themselves are generating a new generation of enthusiasts. Thank you all for organizing so much great information so very conveniently! And thanks to Tektronix for having such a wonderful market for used hardware, I am slowly furnishing my house with it.


Re: Designing a new TM500 storage box

Magic_Smoke
 

Thanks David, this is exactly the kind of feedback I need. How do you feel about a big open-top drawer?