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Re: Probe bags ...

Chuck Harris
 

Oops! I thought you meant the little clear vinyl
bags that hold the probes and tips... I missed the
"manuals" part.

-Chuck Harris

Chuck Harris wrote:

All the originals were was pencil bags for kids to bring
to school, clipped into their 3 ring binders...

Perhaps try a stationary store?

-Chuck Harris

David Slipper wrote:

Has anyone come across a source of probe/manual bags - or a workable
alternative ??

Dave
Re: Probe bags ...

 

I have bought one or two off eBay. Don't forget that there are two sizes for the 4xx scopes - the short one fits the 468 and scopes with the DMM "penthouse". You also need to have a case with both of the fastening features - sometimes the front fixing is missing.
Colin.

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of David Slipper
Sent: 08 December 2018 13:08
To: [email protected]
Subject: [TekScopes] Probe bags ...


Has anyone come across a source of probe/manual bags - or a workable
alternative ??

Dave
Re: Probe bags ...

Chuck Harris
 

All the originals were was pencil bags for kids to bring
to school, clipped into their 3 ring binders...

Perhaps try a stationary store?

-Chuck Harris

David Slipper wrote:


Has anyone come across a source of probe/manual bags - or a workable
alternative ??

Dave
Re: Russian Tunnel Diodes

Chuck Harris
 

I haven't tried Leo's product, so take what I say with a grain of
salt, or two...

The only issue I have with Leo's product is that according to his
pictures, it doesn't have a very good flat top and bottom to the
pulse. The fast rise time is good for measuring the bandwidth of
the scope (which may be all he intended to do), but if you are
wanting to use his pulser to adjust the transient response of a
scope, you need a clean flat top on your test pulse.

Chuck Harris

Craig Sawyers wrote:
...


I understand entirely the interest in building TD pulsers, and replicating/repairing Tek ones.

But a bit of heresy - the Leo Bodnar pulsers produce 30ps rise, and around 24ps fall time. They come
with a calibration certificate too. For UKP49 to UKP99 depending on the output connector. Run from USB
power, from which you can adjust the amplitude from the app. They run at 10MHz with 2.5ppm accuracy,
so can be used for timebase checks too. I have the BNC version, which is the cheapest.



Craig
Re: A cautionary tale ...

 

Hi Dave
Although it is difficult to know where your "spare" screw came from please make sure that the rear right hand side case screw ?is present, it is part of the power supply heat sink path and is frequently missing.
73 George G6HIG

On Saturday, December 8, 2018 12:57 PM, David Slipper <softfoot@...> wrote:



I have acquired a Tek 2225 as a 50MHz analogue alternative to my TDS744A
but before I powered it on I took the case off to make sure nothing had
shaken loose in transit (I make that a policy for mains powered stuff).

Everything was OK but I did find a loose screw rolling around in the PSU
area !!!

I am very glad I gave the thing a "once-over" or I would have allowed
the "magic smoke" to escape !!!

I seem to remember someone else finding loose screws.

One place I worked always played an air line around the kit before
putting the covers on looking for surplus/dropped screws and other rubbish.

BTW I'm very pleased with the 2225, works nicely and is a bit more
portable than the 744A.? I'd have preferred a 2235, but I may get one of
those as well - just don't tell the wife !!! ;-)

Now at 5 and counting ;-)

Dave
Re: Smashed CRT on a 2215 - where to find a substitue?

 

Hi
Where in the world are you, it would be helpful if such requests included such information as shipping cost are a major factor in the viability of supplying spares.
73 George G6HIG

On Saturday, December 8, 2018 1:37 PM, lop pol via Groups.Io <the_infinite_penguin@...> wrote:


On Sat, Dec? 8, 2018 at 06:09 AM, <eksund1900@...> wrote:


Hi!

Just bought a 2215 scope, but unfortunately it was destroyed by the
transportation company.

The CRT tube was smashed. Is it possible to find a spare anywhere in the
world?
And is it a wise thing to do, regarding the relatively low price on those
scopes?
There are several CRT that fit that scope some come with a different HV lead so don't throw the old one away yet before you know if you need to chop off the lead and use the one from the broken CRT. Which I had to do in the case of my 2215. I spliced the leads and used about 5 coats of liquid tape.? I used a 154-0861-00 out of a 2235 found on evil-bay for under $40 shipped. Only you can decide if fixing the scope is worth it.

Brendan
Re: 2235 display problem

 

Try cleaning the beamfinder switch with alcohol, exercise it 10-20 times after that.
Re: Smashed CRT on a 2215 - where to find a substitue?

 

On Sat, Dec 8, 2018 at 06:09 AM, <eksund1900@...> wrote:


Hi!

Just bought a 2215 scope, but unfortunately it was destroyed by the
transportation company.

The CRT tube was smashed. Is it possible to find a spare anywhere in the
world?
And is it a wise thing to do, regarding the relatively low price on those
scopes?
There are several CRT that fit that scope some come with a different HV lead so don't throw the old one away yet before you know if you need to chop off the lead and use the one from the broken CRT. Which I had to do in the case of my 2215. I spliced the leads and used about 5 coats of liquid tape. I used a 154-0861-00 out of a 2235 found on evil-bay for under $40 shipped. Only you can decide if fixing the scope is worth it.

Brendan
2235 display problem

[email protected]
 

I have a Tek 2235 o scope with a 1 1/2¡± vertical solid and fixed y-axis amplitude display that appears on both channels. Changing gain has no effect on the display, neither does changing the focus. Sweep timing is good. CRT display is bright. Using a 500 mV 1kHz square wave at the input does not have any effect on the screen display problem. Referencing the Tek service manual, I cannot find anything on the board amiss using another external oscilloscope to checkwaveforms. What is interesting is that the output signals leading to the upper and lower vertical control plates of the CRT appear clean and undistorted showing the 1kHz square wave, so the the problem must be in the CRT, or the associated circuitry. Has anyone seen this problem or know someone who does? I don¡¯t know how to upload a photo quite yet, but I will figure it out soon.
Tektronix 2465 300MHZ - display too 'tall'

[email protected]
 

Hi, I recently acquired a Tek2465, it seems to work ok, just one thing is that the vertical height is off the top of the screen (the text is half cut off). I can't seem to find a way to narrow it down on on the front panel dials. Is there something that can be adjusted to fix this, or is this similar to arcade CRTs that just need a fresh capacitor kit installed after 30+ years?

And follow up question, where can I source a cap-kits for this model?

Thanks!
Smashed CRT on a 2215 - where to find a substitue?

 

Hi!

Just bought a 2215 scope, but unfortunately it was destroyed by the transportation company.

The CRT tube was smashed. Is it possible to find a spare anywhere in the world?
And is it a wise thing to do, regarding the relatively low price on those scopes?
Probe bags ...

 

Has anyone come across a source of probe/manual bags - or a workable
alternative ??

Dave
A cautionary tale ...

 

I have acquired a Tek 2225 as a 50MHz analogue alternative to my TDS744A
but before I powered it on I took the case off to make sure nothing had
shaken loose in transit (I make that a policy for mains powered stuff).

Everything was OK but I did find a loose screw rolling around in the PSU
area !!!

I am very glad I gave the thing a "once-over" or I would have allowed
the "magic smoke" to escape !!!

I seem to remember someone else finding loose screws.

One place I worked always played an air line around the kit before
putting the covers on looking for surplus/dropped screws and other rubbish.

BTW I'm very pleased with the 2225, works nicely and is a bit more
portable than the 744A.? I'd have preferred a 2235, but I may get one of
those as well - just don't tell the wife !!! ;-)

Now at 5 and counting ;-)

Dave
Re: Russian Tunnel Diodes

 

FWIW there's a very nice 40 pS rise time 10 MHz square wave pulser at leobodnar.com. The BNC version is about $80 US. Leo has just developed a variant that produces 100 pS spikes.

Not germane to making a repair, but if the goal is having a fast step generator it's hard to beat. Each one is individually tested and a printout of the step response provided. Mine actually has a 36 pS rise time. Leo also has them with 3.5 and 2.92 mm connectors spec'd at 30 pS.

I covered mine with a large piece of heat shrink for protection.
Re: Russian Tunnel Diodes

Craig Sawyers
 

There are photos in the group archives. Description somehow messed up during
the transfer from Yahoo but all the photos seem to be still there. Or you
can try to find them in abandoned Yahoo group if it still exists.

Hi Sergey Kubushyn:

Thanks for your reply and I try to find the posted ( is there any photos ?
) ,just message in group .

I will try to build it .

Regard
Tony Cheung
DEC 8 2018
I understand entirely the interest in building TD pulsers, and replicating/repairing Tek ones.

But a bit of heresy - the Leo Bodnar pulsers produce 30ps rise, and around 24ps fall time. They come
with a calibration certificate too. For UKP49 to UKP99 depending on the output connector. Run from USB
power, from which you can adjust the amplitude from the app. They run at 10MHz with 2.5ppm accuracy,
so can be used for timebase checks too. I have the BNC version, which is the cheapest.



Craig
Re: Russian Tunnel Diodes

 

On Sat, 8 Dec 2018, Yiu On Tony C via Groups.Io wrote:

There are photos in the group archives. Description somehow messed up during
the transfer from Yahoo but all the photos seem to be still there. Or you
can try to find them in abandoned Yahoo group if it still exists.

Hi Sergey Kubushyn:

Thanks for your reply and I try to find the posted ( is there any photos ?
) ,just message in group .

I will try to build it .

Regard
Tony Cheung
DEC 8 2018
--------------------------------------------
On Sat, 12/8/18, Sergey Kubushyn <ksi@...> wrote:

Subject: Re: [TekScopes] Russian Tunnel Diodes
To: [email protected]
Date: Saturday, December 8, 2018, 12:47 PM

On Sat, 8 Dec 2018, Yiu On Tony C
via Groups.Io wrote:

GI308D
:) Mil spec variant is called 1I308D i.e. having number 1
instead of
letter G for Germanium. That is
true for all semiconductors made in former
USSR. In cyrillic it is called §¤§ª308§¥ or
1§ª308§¥. GI308zH (§¤§ª308§¨ in
cyrillic) is
even faster having 20mA peak current instead of 10mA for
GI308D
with almost same capacitance 1..4pF
vs 0.8..2pF for GI308D. And finally
there is
GI308K with 50mA peak current having 2.3..8pF capacitance
that is
similar to those used in Tektronix
S-52.

For the pulser built
from 067-0681-01 schematic the proper part is GI308D
that is actually much better than original
Tektronix 152-0177-02 tunnel
diode.

Hi :

I cannot find such
item on ebay ? What is the diode number ?

Thanks for your
help

Regard
Tony Cheung
DEC 8
2018
--------------------------------------------
On Sat, 12/8/18, Jack Reynolds <jackandladyreynolds@...>
wrote:

Subject:
[TekScopes] Russian Tunnel Diodes
To:
[email protected]
Date: Saturday, December 8, 2018, 4:39
AM

Back in 2013
Sergey Kubushyn posted a great
explanation of how to build a clone of a Tektronix
067-0681
TD Pulser.? It required a
specific Russian surplus
tunnel
diode.? While there are always a bunch of
Russian tunnel diodes on eBay, the
specific one he specified
has been
impossible for me to find.? However, some just
appeared on eBay.? There is one group of
10 pcs still
available and they are
quite pricey compared to the other
ones
for sale at $80 USD for 10 pieces.? The prices of
the available pulsers make this look
reasonable.?
However if there is
anyone else as desperate as I have been
to find some they are eBay item no. 323585650249.? I
hope this helps someone.
Jack Reynolds
---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*
Re: Russian Tunnel Diodes

 

Hi Sergey Kubushyn:

Thanks for your reply and I try to find the posted ( is there any photos ? ) ,just message in group .

I will try to build it .

Regard
Tony Cheung
DEC 8 2018
--------------------------------------------

On Sat, 12/8/18, Sergey Kubushyn <ksi@...> wrote:

Subject: Re: [TekScopes] Russian Tunnel Diodes
To: [email protected]
Date: Saturday, December 8, 2018, 12:47 PM

On Sat, 8 Dec 2018, Yiu On Tony C
via Groups.Io wrote:

GI308D
:) Mil spec variant is called 1I308D i.e. having number 1
instead of
letter G for Germanium. That is
true for all semiconductors made in former
USSR. In cyrillic it is called §¤§ª308§¥ or
1§ª308§¥. GI308zH (§¤§ª308§¨ in
cyrillic) is
even faster having 20mA peak current instead of 10mA for
GI308D
with almost same capacitance 1..4pF
vs 0.8..2pF for GI308D. And finally
there is
GI308K with 50mA peak current having 2.3..8pF capacitance
that is
similar to those used in Tektronix
S-52.

For the pulser built
from 067-0681-01 schematic the proper part is GI308D
that is actually much better than original
Tektronix 152-0177-02 tunnel
diode.

> Hi :
>
> I cannot find such
item on ebay ? What is the diode number ?
>
> Thanks for your
help
>
> Regard
> Tony Cheung
> DEC 8
2018
>
--------------------------------------------
> On Sat, 12/8/18, Jack Reynolds <jackandladyreynolds@...>
wrote:
>
> Subject:
[TekScopes] Russian Tunnel Diodes
> To:
[email protected]
> Date: Saturday, December 8, 2018, 4:39
AM
>
> Back in 2013
Sergey Kubushyn posted a great
>
explanation of how to build a clone of a Tektronix
067-0681
> TD Pulser.? It required a
specific Russian surplus
> tunnel
diode.? While there are always a bunch of
> Russian tunnel diodes on eBay, the
specific one he specified
> has been
impossible for me to find.? However, some just
> appeared on eBay.? There is one group of
10 pcs still
> available and they are
quite pricey compared to the other
> ones
for sale at $80 USD for 10 pieces.? The prices of
> the available pulsers make this look
reasonable.?
> However if there is
anyone else as desperate as I have been
>
to find some they are eBay item no. 323585650249.? I
> hope this helps someone.
> Jack Reynolds

---
*
*? KSI@home? ? KOI8
Net? < >? The impossible we do immediately.? *
*? Las Vegas? NV, USA? < >?
Miracles require 24-hour notice.? *
*
Re: Russian Tunnel Diodes

 

On Sat, 8 Dec 2018, Yiu On Tony C via Groups.Io wrote:

GI308D :) Mil spec variant is called 1I308D i.e. having number 1 instead of
letter G for Germanium. That is true for all semiconductors made in former
USSR. In cyrillic it is called §¤§ª308§¥ or 1§ª308§¥. GI308zH (§¤§ª308§¨ in
cyrillic) is even faster having 20mA peak current instead of 10mA for GI308D
with almost same capacitance 1..4pF vs 0.8..2pF for GI308D. And finally
there is GI308K with 50mA peak current having 2.3..8pF capacitance that is
similar to those used in Tektronix S-52.

For the pulser built from 067-0681-01 schematic the proper part is GI308D
that is actually much better than original Tektronix 152-0177-02 tunnel
diode.

Hi :

I cannot find such item on ebay ? What is the diode number ?

Thanks for your help

Regard
Tony Cheung
DEC 8 2018
--------------------------------------------
On Sat, 12/8/18, Jack Reynolds <jackandladyreynolds@...> wrote:

Subject: [TekScopes] Russian Tunnel Diodes
To: [email protected]
Date: Saturday, December 8, 2018, 4:39 AM

Back in 2013 Sergey Kubushyn posted a great
explanation of how to build a clone of a Tektronix 067-0681
TD Pulser.? It required a specific Russian surplus
tunnel diode.? While there are always a bunch of
Russian tunnel diodes on eBay, the specific one he specified
has been impossible for me to find.? However, some just
appeared on eBay.? There is one group of 10 pcs still
available and they are quite pricey compared to the other
ones for sale at $80 USD for 10 pieces.? The prices of
the available pulsers make this look reasonable.?
However if there is anyone else as desperate as I have been
to find some they are eBay item no. 323585650249.? I
hope this helps someone.
Jack Reynolds
---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*
Re: Russian Tunnel Diodes

 

Hi :

I cannot find such item on ebay ? What is the diode number ?

Thanks for your help

Regard
Tony Cheung
DEC 8 2018
--------------------------------------------

On Sat, 12/8/18, Jack Reynolds <jackandladyreynolds@...> wrote:

Subject: [TekScopes] Russian Tunnel Diodes
To: [email protected]
Date: Saturday, December 8, 2018, 4:39 AM

Back in 2013 Sergey Kubushyn posted a great
explanation of how to build a clone of a Tektronix 067-0681
TD Pulser.? It required a specific Russian surplus
tunnel diode.? While there are always a bunch of
Russian tunnel diodes on eBay, the specific one he specified
has been impossible for me to find.? However, some just
appeared on eBay.? There is one group of 10 pcs still
available and they are quite pricey compared to the other
ones for sale at $80 USD for 10 pieces.? The prices of
the available pulsers make this look reasonable.?
However if there is anyone else as desperate as I have been
to find some they are eBay item no. 323585650249.? I
hope this helps someone.
Jack Reynolds
Re: How Many Scopes?

Craig Sawyers
 

Now just what do I do if I have to display more than 12 waveforms at once ?
Ah - you can do that with a single 7844
55741 - 55760 of 208699