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Re: 492 master reference oxco adjustment possible? or useless?

 

The 492BP that I have has the external ref input, accepts 1,2,5,10MHz references (edge close to internal 1MHz PLL.)

P.s.I don't fully understand the tuning mechanism even after reading both service manuals. Its complex as hell. At some lower span the first LO stops sweeping and the second LO takes over? What about the auxiliary?
Locked Re: Dennis Tillman

 

FACT - I invited Chuck to rejoin. He declined to do so.

Discussion ended please.

David

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of cheater cheater
Sent: 15 February 2022 22:42
To: TekScopes <[email protected]>
Subject: Re: [TekScopes] Dennis Tillman

On Tue, Feb 15, 2022 at 2:44 PM Lawrance A. Schneider
<llaassllaaass@...> wrote:

On Mon, Feb 14, 2022 at 01:28 PM, Jim Ford wrote:

A dispute with group co-owner Michael Dunn, as I understand it.
That's incorrect, Jim. There was a dispute and it was about Chuck
acting very badly on the list which is the actual reason he got kicked
off. Other words would better describe his behavior that I won't want
to post here.

In a private message, Chuck told me roughly the same thing. I do not have permission to post that message and thus, will not. I have not asked Mr. Dunn for his version of the dispute as I have never specifically sought his advice about any problems I've had with my scopes and thus have no personal relation with him.
You're using his list, every message you send comes through something
he set up and has been taking care of, that's your personal relation,
you could show a little bit of thankfulness for that.

My wish is that the two groups combine. Chuck has been an inspiration to me and the banter between he and others helped me refurbish a 2445B. As I understand it, the purpose of this group is to EXCHANGE IDEAS. So long as 'banter' is polite, I welcome and appreciate it.
And that's the sticking point. Chuck has been impolite to countless
members. He hasn't been like that to you, so you regularly come back
demanding he gets unbanned. It's not happening.

People like you say "oh I thought this was about the EXCHANGE OF
IDEAS". Yeah, no, you can't have exchange of ideas in vacuum, it's
always connected to people acting personable towards each other, and
Chuck showed time and again that he can't be trusted to do so.
Personally I think people who don't manage to do that are like people
who can't wipe their own butt, and should be pitied, but also it's
been demonstrated they don't belong here.

As I understand it, Chuck has been asked to rejoin the group and declined.
He wasn't. Stop repeating made up stories that aggrandize your friend Chuck.

I like/enjoy/learn from the banter between various peoples on this group and the '2' group.
That's nice - for YOU. Chuck took away this enjoyment from many people.

These groups are the closest 'amateurs' like me have to the peer reviewed journals I used to read so many years ago. The group separation is similar to the censorship of ideas. It is absurd to go from one group and quote something to the other group seeking the banter enjoyed within each SEPARATELY.
Peer reviewed journals exist like they always have. Chuck helped you
repair a few scopes. That's in no way comparable to the sheer amount
of work required to progress the world's state of science to an extent
where someone wants to actually publish you in a peer reviewed journal
that people read. It's a glorified engine oil change, and you're
romanticizing.

The truth is that the list has been faring perfectly well without
Chuck and the likes of him and therefore it's right to say "good
riddance" on someone who's been less than nice to people on here. If
you cared about the list you'd care about how others are being made to
feel, rather than zero-in on what sort of repair advice resources you
can acquire, to the exclusion of any other consideration of other
members of the list. We're not here to entertain a guy who you want to
keep around. You have his email address, go email him on your own
dime, we don't want the toxic radiation.

Every time Dennis Tillmann is brought up you start spinning yarns
demanding Chuck gets unbanned. Dennis has no role in this and probably
wouldn't anyways. Stop asking. He shouldn't have been an a**hole to so
many people.

Can the Chuck thing die off already. It's not happening as long as the
list owner is alive, and you all know it, so drop it.
Locked Re: Dennis Tillman

 

On Tue, Feb 15, 2022 at 2:44 PM Lawrance A. Schneider
<llaassllaaass@...> wrote:

On Mon, Feb 14, 2022 at 01:28 PM, Jim Ford wrote:

A dispute with group co-owner Michael Dunn, as I understand it.
That's incorrect, Jim. There was a dispute and it was about Chuck
acting very badly on the list which is the actual reason he got kicked
off. Other words would better describe his behavior that I won't want
to post here.

In a private message, Chuck told me roughly the same thing. I do not have permission to post that message and thus, will not. I have not asked Mr. Dunn for his version of the dispute as I have never specifically sought his advice about any problems I've had with my scopes and thus have no personal relation with him.
You're using his list, every message you send comes through something
he set up and has been taking care of, that's your personal relation,
you could show a little bit of thankfulness for that.

My wish is that the two groups combine. Chuck has been an inspiration to me and the banter between he and others helped me refurbish a 2445B. As I understand it, the purpose of this group is to EXCHANGE IDEAS. So long as 'banter' is polite, I welcome and appreciate it.
And that's the sticking point. Chuck has been impolite to countless
members. He hasn't been like that to you, so you regularly come back
demanding he gets unbanned. It's not happening.

People like you say "oh I thought this was about the EXCHANGE OF
IDEAS". Yeah, no, you can't have exchange of ideas in vacuum, it's
always connected to people acting personable towards each other, and
Chuck showed time and again that he can't be trusted to do so.
Personally I think people who don't manage to do that are like people
who can't wipe their own butt, and should be pitied, but also it's
been demonstrated they don't belong here.

As I understand it, Chuck has been asked to rejoin the group and declined.
He wasn't. Stop repeating made up stories that aggrandize your friend Chuck.

I like/enjoy/learn from the banter between various peoples on this group and the '2' group.
That's nice - for YOU. Chuck took away this enjoyment from many people.

These groups are the closest 'amateurs' like me have to the peer reviewed journals I used to read so many years ago. The group separation is similar to the censorship of ideas. It is absurd to go from one group and quote something to the other group seeking the banter enjoyed within each SEPARATELY.
Peer reviewed journals exist like they always have. Chuck helped you
repair a few scopes. That's in no way comparable to the sheer amount
of work required to progress the world's state of science to an extent
where someone wants to actually publish you in a peer reviewed journal
that people read. It's a glorified engine oil change, and you're
romanticizing.

The truth is that the list has been faring perfectly well without
Chuck and the likes of him and therefore it's right to say "good
riddance" on someone who's been less than nice to people on here. If
you cared about the list you'd care about how others are being made to
feel, rather than zero-in on what sort of repair advice resources you
can acquire, to the exclusion of any other consideration of other
members of the list. We're not here to entertain a guy who you want to
keep around. You have his email address, go email him on your own
dime, we don't want the toxic radiation.

Every time Dennis Tillmann is brought up you start spinning yarns
demanding Chuck gets unbanned. Dennis has no role in this and probably
wouldn't anyways. Stop asking. He shouldn't have been an a**hole to so
many people.

Can the Chuck thing die off already. It's not happening as long as the
list owner is alive, and you all know it, so drop it.
Re: Test Post

 

Test failed. Please cal#($(@+@-^?????
NO CARRIER

Enviado do meu Tele-Movel

Em ter, 15 de fev de 2022 18:16, Bill Perkins <sales@...>
escreveu:

No reply needed

BP
Re: Test Post

 

Hello Liam, please send me my manual.

On Tue, Feb 15, 2022 at 10:16 PM Bill Perkins <sales@...> wrote:

No reply needed

BP
Re: Stuff Season opens for 2022 Tuesday at Sphere

walter shawlee
 

Jared,

ti seems we stupidly threw them out, so I deleted them.
thanks for the info though.

-walter
Test Post

 

No reply needed

BP
Re: counter problem

 

Thank you Harry.
That was my guess, but I could not find any reference in the manual. Mind you, it is a repro from the wiki site and it may not be complete.
Time to start over.

Jose

-----Original Message-----
From: Harvey White
Sent: Monday, February 14, 2022 5:49 PM
To: [email protected]
Subject: Re: [TekScopes] counter problem

That sounds a lot like an error code, which is documented in a very
small and obscure portion of the manual.

There's a similar type (guessing here for the DC5030A) of error message
on the DM5010 DMM. It indicates that the calibration has been lost
because the internal NiCd battery is dead and the battery backed up RAM
(which holds calibration constants) is dead.

First, I'd see if there's a battery on board. Dead battery is the
source of many error messages.

Secondly, there may be that error code section in the manual (possibly
service manual).

I'd go from there.

Harvey



On 2/14/2022 6:23 PM, Joseph Orgnero wrote:
A while ago, I found, at a ham swap, a TM500 DC5030A counter., SN B011601, visually good condition, but, on being powered shows what, for me, is an odd fault.
With or no input, digits on te right side show the number 224 with no change regardless the settings of the controls
At the same time, the digits on the left side glow very faintly
The decimal point can be shifted and all the digits glow well when pressing Reset. Besides that there is no response to the controls or
input and the manual offers no clues.
Any ideas as to the cause of ths fault ?

Thanks in advance

Jose Orgnero VE7LBI










--
Jose Orgnero
Locked Re: Dennis Tillman

 

Lots of support for Chuck Harris coming back. I don¡¯t.

He took a hard nip at me once after he misread twice, a post I made a few years ago.

Said I should take up a different hobby and save my family grief.


NielsenTelecom
Re: A sick 465B

 

Jeff,

R4124 is the correct resistor that is 22meg (red red blue gold). The Mouser number is a metal film type. Go ahead and get ten (price break) or more for spares for your other scopes. It might be best to replace the resistor. That way you know it is known accurate and not have the varying intensity at turn-on.

I am glad to help you. You are welcome.

Mark
Re: 492 master reference oxco adjustment possible? or useless?

 

On Mon, Feb 14, 2022 at 08:26 PM, John Miles wrote:


It may be a good idea to drill a hole in the cover and adjust the trimmer
through it,
Hi KE5FX:
The probable problem with drilling an adjustment access hole, in the case, is locating the hole's center accurately.
If the hole ends up off-center, making it bigger is sometimes an option.
IME, the hole is usually larger (usually much larger) than what is needed, or appropriate.

--
Roy Thistle
Re: A sick 465B

 

Mark,

Thank you for the detailed list of replacement parts.

I am working my way through repairs to this scope (I have a list with at least ten entries, including recapping the power supply and replacing the CRT), and the work is going a bit slowly (partly due to other projects unexpectedly demanding the bench). The new CRT will be arriving today, so I think I should address the beam intensity issue soonest, so I can verify that the new CRT is in good order. To that and, I would like to check the 22M resistor that you said may have gone high in the CRT circuit. Is the resistor in question R4124? If so, is there a good reason to not simply replace that with a common metal or carbon film resistor?

¡ª Jeff Dutky
Locked Re: Dennis Tillman

 

I¡¯m glad to hear that Dennis is doing well, and look forward to him rejoining the conversation, when he is able.

As for TekScopes2, I second the recommendation to join that group as well as this one. Traffic on the group is still fairly light, but not as light as when I joined a year ago. Being a member of both groups does give me a little bit more to read on the topic of Tek instruments and their maintenance, which is welcome, and, yes, the kinds of responses you get is different for each group, which is also welcome.

Between the two groups, and a couple of groups I am a member of on other platforms, I get a satisfying amount to read on a daily basis, as well as a satisfyingly wide range of opinions and topics, but without the fire-hose effect of reading something like the EEVblog forums.

¡ª Jeff Dutky
Re: Tek 453 Trigger Fault

 

The manual is available at w140.com .
My low-serial-number 453 lost B trigger in 2000-something. I traced it down to tunnel diode D675. It worked after I installed a spare, then failed again. This time I traced it to Q684. I replaced it with a USSR KT3126A (PNP 20V 20mA 500MHz 2.5pF) and it has worked ever since. There are Nuvistors in the trigger circuits (V443 and V633) but they are okay.

HTH,
Dave Wise

From: [email protected] <[email protected]> On Behalf Of Taylor_d2010 via groups.io
Sent: Monday, February 14, 2022 2:59 PM
To: [email protected]
Subject: [TekScopes] Tek 453 Trigger Fault

Hi everyone,

A friend of mine has contacted me (because i dabble with Scopes from time to time) about his Tek 453, its been sat in his garage for a while and is in bit of a sorry looking state but he wants to use it for some repairs on his Motorbikes. Ive only seen a photo of it so far, and he says that the fault is that the scope will Trigger on Channel B but not Channel A.

He hasnt double checked it yet, but he does believe it has a 6x10cm display, so we think it might be a pre 1971 model (his photo also shows 453 not a 453A), which if TekWiki is correct, means its more likely to have Nuvistors inside.

As im not familiar with the Tek scopes of this vintage or Nuvistors for that matter, im wondering if its really repairable or not, it will be a few weeks until im over his way again to get an actual look over the instrument. Just looking for some thoughts/opinions on the practicality of repairing these. Admittedly from browsing auction sites etc, it doesnt look like the 453's are all that common in the UK. Not yet browsed any service/schematics yet so may not even have any Nuvistors in the trigger circuit etc, but want to feel a bit more confident about it before agreeing to take a look at it for him.

thanks in advance,
Taylor
Locked Re: Dennis Tillman

 

Good points Harvey.
Locked Re: Dennis Tillman

 

In a word, not a good idea to combine both groups.

The philosophy behind any group lays with the owner and moderators.

The moderators are ethically constrained by the owner, it is, after all, his group.

The two groups are very different.? There is a very valid reason (to those who did move or join) the other group.

Then philosophy aside, who would be in charge of this new supergroup?

If you are not a member of the other group, I'd suggest you join.

The groups tend to work to slightly different purposes, so you may well get different answers.


Harvey

On 2/15/2022 8:44 AM, Lawrance A. Schneider wrote:
On Mon, Feb 14, 2022 at 01:28 PM, Jim Ford wrote:

A dispute with group co-owner Michael Dunn, as I understand it.
In a private message, Chuck told me roughly the same thing. I do not have permission to post that message and thus, will not. I have not asked Mr. Dunn for his version of the dispute as I have never specifically sought his advice about any problems I've had with my scopes and thus have no personal relation with him.

My wish is that the two groups combine. Chuck has been an inspiration to me and the banter between he and others helped me refurbish a 2445B. As I understand it, the purpose of this group is to EXCHANGE IDEAS. So long as 'banter' is polite, I welcome and appreciate it.

I am sure both gentleman are proud and honest people. As I understand it, Chuck has been asked to rejoin the group and declined. My hope is that others write him and encourage him to rejoin. As outlined above, I like/enjoy/learn from the banter between various peoples on this group and the '2' group. With two groups, banter is limited by lack of a common platform.

These groups are the closest 'amateurs' like me have to the peer reviewed journals I used to read so many years ago. The group separation is similar to the censorship of ideas. It is absurd to go from one group and quote something to the other group seeking the banter enjoyed within each SEPARATELY.

Simply, I hope people encourage Chuck to rejoin and the two groups combine to one.

Thanks, larry
Re: 2465 Delta Cursor not visible

 

Inflation.

Harvey

On 2/15/2022 7:59 AM, David Templeton wrote:
Thought I¡¯d was a thousand words ;-)

David

On 15 Feb 2022, at 12:52, Jean-Paul <jonpaul@...> wrote:

?photos worth a million words
Re: 212, 213, was Re: [TekScopes] New kid on the block...

 

On Sat, Feb 12, 2022 at 04:09 AM, Roy J. Tellason, Sr. wrote:


I have some spare bare PCB's as in my video if you want to build the rectifier upgrade in that document too. (I can probably scratch up all the parts needed too, if you want to buy it as a kit).
I might be interested. How necessary is that mod? And what sort of cost are we talking about?
I don't think it's critical to do the upgrade, but it does help with the reliability of the unit, hence the reason Tek made the upgrade in the first place. :)
If you are inside the unit doing repairs anyway, it's probably worth doing the upgrade while you are there.
I think US$10 plus postage would cover the kit. Contact me off list if you are interested and we can work something out.

Jared.
Re: For sale: Tektronix 2467BHD

 

Before I list on the auction site I thought I¡¯d sweeten the deal here. I¡¯ll include a front cover (not in the best condition but will protect the scope during shipping) as well as a set of original hard copy service manuals. This is the service manual and the options service manual.
Re: 2465 Delta Cursor not visible

 

Correct; everything appears to operate normally except that you can't actually see where the Delta cursor is!!

That is to say that the brightness of the Delta cursor is suppressed (invisible) compared to the REF cursor. To repeat; this applies regardless of whether in Time or Voltage mode.
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