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Re: Tek 555 part needed.

zerousair
 

Morris/John,
Here's the pin voltages I read today on both beam HV supplies:
V900 pin1 +223.6 V800 pin 1 +47.6
pin 4 0 pin 4 0
pin 5 -.294 pin 5 -.278
pin 6 -17.9 pin 6 -51.5
pin 7 0 pin 7 0
pin 9 +310 pin 9 +311

V914 pin 1 -145.6 V814 pin 1 -1.3
pin 2 -149.8 pin 2 -160.8
pin3 -150 pin 3 -150
pin 4 -.292 pin 4 -.267
pin 5 -.292 pin 5 -.267
pin 6 -145.6 pin 6 +52.0
pin 8 0 pin 0
pin 9 0 pin 0


The high voltage test points are at the anodes of V962, LB and V862 UB.


CRT pin 11 -681
pin 12 -760
pin 4 -1275
pin 2 -1337


My tube tester won't work on V900/800, but I swapped them side to side with no change in the problem. V914/814 both check good. With the help of you guys, I'm getting a better understanding of how this circuit works and seems to me T901 might be putting an excessive load on the circuit as was already mentioned. Haven't worked much at all with these old tube circuits since '68 when I was a Marine in Navy avionics school. Can't unsolder the trans, and check the resistance as my left hand is in a cast for 2 more months. Emailed a fellow today who might be able to rewind T901 for me though. I really appreciate the input from you guys.


Garrett

Re: looking forward to ebay shipment for about 5 weeks now

EB4APL
 

I received some weeks ago a shipping from a well known seller in Greece.
The envelope had been opened and resealed and the inside container (a
pharmacy like pills tube) that contained a chip was resealed with a red
tape that read "DOUANE SCANTEAM". I wonder which customs it was
referring to, because the Spanish Customs language is Spanish and I
suppose the Greek Customs use their own language. Maybe there are some
international agreements between the Homeland Security Agencies
regarding their inspection labels to avoid multiple checks.
There is not need to say that this shipment arrived with a great delay.

Ignacio



El 09/02/2016 a las 15:39, Artek Manuals manuals@...
[TekScopes] escribió:

Christopher

We ship a lot of small packages every week to Europe from the USA for
15+ years

It used to be that Italy used to have the longest postal deliveries from
here in the USA. It was so bad that at one point we seriously considered
blocking all sales to Italy because we were getting negative reviews
from Italian customers on Ebay sales for long deliveries .. but they
seem to have solved the problem of late. Starting about 3 years ago
Germany became the slowest (4-5 weeks not being untypical vs 4-5 days to
the UK) I suspect that the delay is in customs and not the actual
postal service.

IF you want to be really paranoid it could be postulated that the
increased delay is due to what ever passes for homeland security in
Germany is now involved in the screening process to see if your
importing bomb making material. IF that is true your pile of electronics
probably raised a flag that led to advanced security screening and may
have even landed you an some kind of watch list !

Paranoia pays ...but the hours are hell

Dave
ArtekManuals.com

On 2/9/2016 9:25 AM, christophkukulies@... [TekScopes] wrote:
Hardly finished writing this down, lo and behold, the postman has
delivered the packet today!
Everything's fine.
--
Dave
Manuals@...
www.ArtekManuals.com

-


---
El software de antivirus Avast ha analizado este correo electrónico en busca de virus.
https://www.avast.com/antivirus


[Non-text portions of this message have been removed]

Re: Ebay Rip-off ? - "Global Shipping Program"

John Griessen
 

On 02/09/2016 06:32 AM, musher@... [TekScopes] wrote:
I am really interested to see how the Global Shipping Program works as I have just purchased my first Tektronix item from the USA
for delivery in the UK.
Was there a larger than usual shipping charge already?

Re: looking forward to ebay shipment for about 5 weeks now

ArtekManuals
 

Ohhh given the number of manuals I ship to people with odd sounding names I have been a person of interest for years <grin>.

During my professional career in electronics (much of it DOD) I cant remember how many hours I spent hooked up to a polygraph answering questions, If I were on any list I'm sure I get quickly vetted <grin>. You other guys however are on your own ... I paid my dues ... I no longer wonder about black sedans following me home from work

Paranois pays ...but the hours are hell

Dave
ArtekManuals

On 2/9/2016 10:24 AM, Stefan Trethan stefan_trethan@... [TekScopes] wrote:
And because of you two we will now all be shot on sight, thanks a lot. ;-)

ST

On Tue, Feb 9, 2016 at 4:15 PM, Malcolm Hunter
malcolm.r.hunter@... [TekScopes] <TekScopes@...>
wrote:
> On 9 February 2016 at 14:39, Artek Manuals manuals@...
> [TekScopes] <TekScopes@...> wrote:
>
>> IF you want to be really paranoid it could be postulated that the
>> increased delay is due to what ever passes for homeland security in
>> Germany is now involved in the screening process to see if your
>> importing bomb making material. IF that is true your pile of electronics
>> probably raised a flag that led to advanced security screening and may
>> have even landed you an some kind of watch list !
>>
>> Paranoia pays ...but the hours are hell
>>
>
> You realise you just became a person of interest putting those words
in an
> email (and now so have I) :)
>
> Malcolm
>
--
Dave
Manuals@...
www.ArtekManuals.com

Re: 7904 - Very Dim Trace

Siggi
 

On Tue, 9 Feb 2016 at 12:00 jimmcintyre22@... [TekScopes] <
TekScopes@...> wrote:

At this point, I'm pretty sure I made a big mistake using carbon resistors
in my homebrew HV probe. I had no idea how bad their voltage coefficient
was.
I wonder if you can't use the existing HV divider in the scope to get a
better reading. If you measure the resistance of the resistors in the
divider with the scope off, and then measure the voltage over the low
element of the divider, wouldn't that give you the voltage (assuming the
scope's divider is sane)?

Re: 7904 - Very Dim Trace

Carl Hallberg
 

If you look up the breakdown voltage of carbon composition resistors, you'll see for individual units it is between 350v to 500v. Also depends on manufacturer, how many in series, how protected from arcing. Look inside a High Voltage probe and you will find a spiral wound film resistor.
Carl
--------------------------------------------

On Mon, 2/8/16, David @DWH [TekScopes] <TekScopes@...> wrote:

Subject: Re: [TekScopes] Re: 7904 - Very Dim Trace
To: TekScopes@...
Date: Monday, February 8, 2016, 11:25 PM


 









On 08 Feb 2016 18:25:32 -0800, you wrote:



> To David - My HV probe is a bit suspect. I didn't
want to apply 3kV to my Fluke, so I ginned up a voltage
divider. It's spot on at 100V, but maybe the carbon
resistors misbehave at higher voltages. Thanks for bringing
this up. I'll poke around and see if I can find a
decent HV probe.



> To David - Yes, U1635's output measures 0.6 -
0.9V.



My guess then is that the cathode voltage is correct and it
is the

probe which is a problem. Carbon resistors have a poor
temperature

coefficient so self heating will be a problem and at high
voltages,

their voltage coefficient will contribute a significant
error as well.



> To Marian and David - XY deflection is OK - certainly
not off by more than a few %.



I thought you posted that the trace was
"compressed".



There must be more than one problem if the trace is dim,
compressed,

*and* the beam finder does not work.











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Re: 7904 - Very Dim Trace

Jim McIntyre
 

Thanks for detailing the beamfinder operation.

At this point, I'm pretty sure I made a big mistake using carbon resistors in my homebrew HV probe. I had no idea how bad their voltage coefficient was.


So, I agree - the cathode voltage is probably OK, and I'll start going through the Z-axis amp. I also ordered a Z-axis board off eBay for a parts source, if needed.

Re: Tektronix 585

Anton Bgn
 

Hello Albert,

The 6AU5 is ok on the tube tester, but I will try with a new one soon.
The HV transformer and all HV caps are new

Thank you for your reply

Antoine

Re: OT: Win 8.1 and 10?

Richard L. Wurdack
 

I run a dozen or so apps on XP, 7, 8.1 and 10 some of those apps began on 3.10. I find the fuss of keeping up with all those pretty close to chaos and quite annoying.

----- Original Message -----
From: "'Richard R. Pope' mechanic_2@... [TekScopes]" <TekScopes@...>
To: <TekScopes@...>
Sent: Monday, February 08, 2016 7:40 PM
Subject: Re: [TekScopes] OT: Win 8.1 and 10?


R.L.,
Who are you addressing??
Thanks,
rich!

On 2/8/2016 9:38 PM, 'R.L. Wurdack' dickw@... [TekScopes] wrote:

This is madness!

----- Original Message -----
From: lea56@... [TekScopes]
To: TekScopes@...
Sent: Monday, February 08, 2016 7:11 PM
Subject: Re: [TekScopes] OT: Win 8.1 and 10?

Oh agree to that, Dave! Nice when knowledge speaks out. ;)








------------------------------------

------------------------------------


------------------------------------

Yahoo Groups Links



Scope Parts

Malcolm Hunter
 

Hi,

So I'm going blind constantly looking out for parts / donor scopes. The
problem with donor scopes is they can become projects and I want to get on
with enjoying what I have and not creating new projects. To this end, I'd
like to just get hold of a few parts to complete the scopes (externally at
least) that I have.

Does anyone have any of the following parts they'd like to sell me?

465B:
1 x 366-1280-00 (trigger slope switch)
2 x 366-1278-00 (trigger knob)

310A
2 x 348-0014-00 (foot)
up to 8 x 348-0015-00 (rubber insert for above)

Thanks,
Malcolm

PG506 needs some repair

Christoph
 

Anybody here being familiar with the PG506. The one I received has some issues.
The standard level output doesn't seem deliver any signal. Fast fall and fast rise deliver a signal. The voltage level knob is a bit jumpy, no smooth voltage increase/decrease. The VAR knob shows the two digit 7-segment dispay kind of working, I tested at 100KHz, didn't test other frequencies yet.

--
Christoph

Re: looking forward to ebay shipment for about 5 weeks now

stefan_trethan
 

And because of you two we will now all be shot on sight, thanks a lot. ;-)

ST

On Tue, Feb 9, 2016 at 4:15 PM, Malcolm Hunter
malcolm.r.hunter@... [TekScopes] <TekScopes@...>
wrote:

On 9 February 2016 at 14:39, Artek Manuals manuals@...
[TekScopes] <TekScopes@...> wrote:

IF you want to be really paranoid it could be postulated that the
increased delay is due to what ever passes for homeland security in
Germany is now involved in the screening process to see if your
importing bomb making material. IF that is true your pile of electronics
probably raised a flag that led to advanced security screening and may
have even landed you an some kind of watch list !

Paranoia pays ...but the hours are hell
You realise you just became a person of interest putting those words in an
email (and now so have I) :)

Malcolm






------------------------------------
Posted by: Malcolm Hunter <malcolm.r.hunter@...>
------------------------------------


------------------------------------

Yahoo Groups Links


Re: looking forward to ebay shipment for about 5 weeks now

Malcolm Hunter
 

On 9 February 2016 at 14:39, Artek Manuals manuals@...
[TekScopes] <TekScopes@...> wrote:

IF you want to be really paranoid it could be postulated that the
increased delay is due to what ever passes for homeland security in
Germany is now involved in the screening process to see if your
importing bomb making material. IF that is true your pile of electronics
probably raised a flag that led to advanced security screening and may
have even landed you an some kind of watch list !

Paranoia pays ...but the hours are hell
​You realise you just became a person of interest putting those words in an
email (and now so have I) :)

Malcolm​


[Non-text portions of this message have been removed]

Re: 2465 scopes with poor vertical linearity

 

Apart from PS problems:

Vertical nonlinear compression in 24X5 'scopes has been known to be caused by Channel Switch Hybrid (U400) failure, especially if only Channels 1 and 2 are affected.
Compression only near the bottom is not typical for that failure mechanism though.

Easy to check CH1-2-3-4 and hybrid swap if in doubt.

Raymond

Re: looking forward to ebay shipment for about 5 weeks now

ArtekManuals
 

Christopher

We ship a lot of small packages every week to Europe from the USA for 15+ years

It used to be that Italy used to have the longest postal deliveries from here in the USA. It was so bad that at one point we seriously considered blocking all sales to Italy because we were getting negative reviews from Italian customers on Ebay sales for long deliveries .. but they seem to have solved the problem of late. Starting about 3 years ago Germany became the slowest (4-5 weeks not being untypical vs 4-5 days to the UK) I suspect that the delay is in customs and not the actual postal service.

IF you want to be really paranoid it could be postulated that the increased delay is due to what ever passes for homeland security in Germany is now involved in the screening process to see if your importing bomb making material. IF that is true your pile of electronics probably raised a flag that led to advanced security screening and may have even landed you an some kind of watch list !

Paranoia pays ...but the hours are hell

Dave
ArtekManuals.com

On 2/9/2016 9:25 AM, christophkukulies@... [TekScopes] wrote:
Hardly finished writing this down, lo and behold, the postman has
delivered the packet today!
Everything's fine.
--
Dave
Manuals@...
www.ArtekManuals.com

Re: OT: Win 8.1 and 10?

Peter Gottlieb
 

The one I used is legit, it was checked out by the IT dept where I work and MS says they are authorized. I don't know about any others. It worked for me, and when the installation ran into a problem, MS gave me a different key which allowed another install.

Read the terms. The inexpensive versions only allow installation on one system.


Peter

On Feb 9, 2016, at 9:06 AM, Paul Amaranth paul@... [TekScopes] <TekScopes@...> wrote:

Many of the low cost sellers are selling unauthorized copies.
They work fine, but if you have to reinstall it for some reason
a year or so later, the activation key won't work.

On Tue, Feb 09, 2016 at 08:36:19AM +0000, Malcolm Hunter malcolm.r.hunter@... [TekScopes] wrote:
On 9 February 2016 at 03:10, Peter Gottlieb hpnpilot@... [TekScopes] <
TekScopes@...> wrote:

If you need to, SoftwareKing offers legitimate keys to MS Office for
direct download from MS for $95. My wife needed it and I downloaded and
activated without problems.

Not free but if you must have it the price isn't insane.
​Surely you can find it cheaper than that? I found it for about $74 in the
UK.

http://buymsoffice.co.uk/microsoft-office-home-student-2010.html


Malcolm​






!DSPAM:56b9a434161771501311907!
--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows


[Non-text portions of this message have been removed]

Re: OT: Win 8.1 and 10?

Geoffrey Thomas
 

If you don't get a COA, it probably isn't legit.
Avoid downloads, get a cd/dvd copy.

Geoff.

On 09/02/2016 14:06, Paul Amaranth paul@... [TekScopes] wrote:
Many of the low cost sellers are selling unauthorized copies.
They work fine, but if you have to reinstall it for some reason
a year or so later, the activation key won't work.

On Tue, Feb 09, 2016 at 08:36:19AM +0000, Malcolm Hunter malcolm.r.hunter@... [TekScopes] wrote:
On 9 February 2016 at 03:10, Peter Gottlieb hpnpilot@... [TekScopes] <
TekScopes@...> wrote:

If you need to, SoftwareKing offers legitimate keys to MS Office for
direct download from MS for $95. My wife needed it and I downloaded and
activated without problems.

Not free but if you must have it the price isn't insane.
​Surely you can find it cheaper than that? I found it for about $74 in the
UK.

http://buymsoffice.co.uk/microsoft-office-home-student-2010.html


Malcolm​

Re: looking forward to ebay shipment for about 5 weeks now

Christoph
 

Hardly finished writing this down, lo and behold, the postman has delivered the packet today!
Everything's fine.

--
Christoph

Re: 7904 - Very Dim Trace

 

On 08 Feb 2016 22:06:38 -0800, you wrote:

No, I didn't say the trace was compressed.
That was my mistake. I got the 7904 and 7904A threads confused.

RE: beamfinder. This has 3 functions, right? It blurs the trace, limits the deflection,and intensifies the beam. Mine limits the deflection and blurs the trace. It does not make it brighter.
That is right . . . maybe and sort of.

I tried tracing the schematic and there are a bunch of drafting errors
around the beam finder switch in the schematic so I powered up my 7904
and made these observations:

1. Traces are compressed horizontally and vertically but the readout
is only compressed horizontally. Checking the CRT vertical amplifier
schematic shows that this behavior with the readout is deliberate.

2. Intensity was *not* changed with the beam finder activated.

3. Only traces were blurred; the readout focus was unchanged.

My manual says the beam finder switch can be locked in the outward
position but my 7904 does not do this - weird.

Only one symptom - dim trace.
I agree with Marian. Check the output of the z-axis amplifier for
proper operation and if it is good, replace the high voltage
capacitors and diodes in the DC restorer circuit.

For what it is worth, correct deflection means that the cathode
voltage is correct.