Re: Early 465 CRT "mesh" or "Post Accelerator Grid".
Eureka! There it is, right in front of me.
Dave
toggle quoted message
Show quoted text
On Tuesday, April 6, 2021, 02:26:57 PM PDT, Raymond Domp Frank <hewpatek@...> wrote: On Tue, Apr? 6, 2021 at 09:55 PM, Dave Peterson wrote:
I was wondering if you can see what's driving the wire to pin 12 of the CRT.
The early 070-1330-00 service manuals do not appear to have the necessary
components in the board diagrams for A9.
Sure it does. We're talking about VR1434 and C1434 in the CRT schematic. Figure 7-17 shows them just to the right of the space between the long ceramic combined resistor R1431? and C1404, right above C1404 and CR1404, printed diagonally. Raymond
|
Re: Early 465 CRT "mesh" or "Post Accelerator Grid".
That's what I was looking for.
Yeah, exactly, the early service manual doesn't include those components, and those are the components that are supposed to drive pin 12 of the CRT.
Your picture shows your board matches the early service manual and does not include CR1427, R1428, and VR1428 (note: previous message called out R1427 instead of R1428).
See the picture I just added. Your board doesn't have these. Interesting. Talk about missing parts!
Dave
toggle quoted message
Show quoted text
On Tuesday, April 6, 2021, 02:16:37 PM PDT, Stephen <stephen.nabet@...> wrote:
C1427, R1427??
I don¡¯t see them on the pictures you posted....? ??¡á?
Look at the one I¡¯m posting right now
|
Re: Early 465 CRT "mesh" or "Post Accelerator Grid".
Hi all,
A while back I transplanted a 465 CRT to a 2235, and in that one too I needed to add the Pin12 wire and components to provide the appr. 110VDC.
Like Raymond said, just one resistor, diode and capacitor.
Saludos,
Leo
|
Re: UPDATE : Tek 2430 Works Fine for 15mins Then Freezes
Thanks to all that offered advice on my freezing TEK 2430. I've replaced the RIFA safety caps and all of the less than 50v electrolytics in the low voltage supply.
I'm at the 4 hour mark and everything is still rock stable and running as it should.
I really appreciate having this resource to lean on when things go "south". Great bunch of helpful folks.
John / K7RLD
|
Re: Early 465 CRT "mesh" or "Post Accelerator Grid".
On Tue, Apr 6, 2021 at 09:55 PM, Dave Peterson wrote:
I was wondering if you can see what's driving the wire to pin 12 of the CRT.
The early 070-1330-00 service manuals do not appear to have the necessary
components in the board diagrams for A9.
Sure it does. We're talking about VR1434 and C1434 in the CRT schematic. Figure 7-17 shows them just to the right of the space between the long ceramic combined resistor R1431 and C1404, right above C1404 and CR1404, printed diagonally. Raymond
|
Re: Early 465 CRT "mesh" or "Post Accelerator Grid".
C1427, R1427??
I don¡¯t see them on the pictures you posted.... ??¡á?
Look at the one I¡¯m posting right now
|
Re: Early 465 CRT "mesh" or "Post Accelerator Grid".
Hi Stephen,
No, I was asking about components underneath the HV cover on the bottom of the scope. It looks from your pictures that you already have it off - I can see one of the hex stud posts next to Q1566. The last remaining power supply driver that's mounted to the heat sink.
I was wondering if you can see what's driving the wire to pin 12 of the CRT. The early 070-1330-00 service manuals do not appear to have the necessary components in the board diagrams for A9. See the photos I've added to your album (not posting links since they seem to be causing problems and potentially more confusion). This is the rear of the A9 board adjacent to the vertical pre-amp assembly, opposite the power supply side (left and right are confusing depending on orientation of the scope - looking at A9 the scope is upside-down).
I'm curious what your board has. In researching your original question I found that, at least with regards to C1549, your A9 board is constructed per the early service manual board diagram. That made me wonder what the mesh driver circuit on your board looks like, since the early service manual does not include any mesh driver schematic nor board components.
My original and fundamental concern is/was the uniqueness of early 465 CRTs. But it seems the early 465 CRTs should have a mesh, and therefore are interchangeable with later 465 CRTs. My conclusion, based on the location of C1549, was that this appeared to be a very early 465 and that it might not have the mesh/circuits. Presuming that yours does have the components CR1427, R1427, and VR1428 as indicated in the later service manuals, then you have an A9 board that is a hybrid/intermediate variation that includes the "old" C1549 location and "new" CR1427/R1427/VR1428 installations. It would make for an interesting documentation of such a board as it does not seem to be documented in either service manual.
Pardon the thread theft, and I'm sure I've flogged this dead horse enough.
Dave
toggle quoted message
Show quoted text
On Tuesday, April 6, 2021, 10:28:56 AM PDT, Stephen <stephen.nabet@...> wrote:
Dave,
I don¡¯t seem to find your last message.? But you were asking me something regarding removing the back to take a picture of the CRT pins, correct?
Could you refresh my memory?
|
On Tue, Apr 6, 2021 at 08:20 PM, Siggi wrote:
Rather than going this way, you might try to re-lube the motor. On my 485,
which had a horribly noisy & rattling fan, I did this successfully.
In 465/475 family 'scopes, I've encountered a few motors with worn-out sintered bronze bearings, causing a very unpleasant rumbling noise. I could clearly feel the radial play, mostly in one direction. Fortunately, I had a few donors available, which I treated mostly the way you suggest. Raymond
|
Re: Early 465 CRT "mesh" or "Post Accelerator Grid".
On Tue, Apr 6, 2021 at 03:54 AM, Dave Peterson wrote:
When you were asking him about his board part number you seemed to have a
similar board at hand? Do you? How does this earlier board drive pin 12?
I have one board left. It looks very old and is quite dirty. It carries ref. no. 670-2233, like Stephen's. The HV multiplier has date code 7341, earliest component dates are 7337, latest "originals" are 7431, so it's probably a 250000-plus board. It has the ganged focus tracking pot and has the mesh components (C/CR/R1427, C/R1428 and C1418/1419 (one dipped tantalum cap 47uF/35V) in the locations as indicated in the 250000-plus SM 070-1861-00. CRT pin 12 has been in use and connected and probably connected to C1427. Raymond
|
On Sat, Apr 3, 2021 at 2:41 PM durechenew via groups.io <durechenew= [email protected]> wrote: For those with a 2465A (or maybe B) version; I just received a 2465. Very
clean and good looking inside; probably heavy usage, though, considering
the status of the blower: noisy.
Another thing I noticed (didn't mention that actually works normal - up to
a point) is that adjusting intensity it goes in a de-focus state; partially
adjustable, but you don't want to do that every time you go from low
frequency to higher. Could be a CRT issue or something in the control
circuits; have to do some verification.
The first issue is the one I need some help with: the blower's motor is a
Siemens device that's beyond repair and I'm considering the idea of
changing the whole blower with a regular fan and some mods in the path of
airflow; that if there is a kind soul that could take the trouble to
provide a picture of the fan in a 2465A; from SM I take it might be not a
blower, but a regular fan; I might be also wrong.
I went through the conversion with my 2465, replacing the wonderful impeller fan with a 60mm case fan. I hated it so much that I bought a new Siemens motor when one came up on eBay and I reverted the modification. Note that the back cover on the 2465 doesn't leave as much room as does the cover for e.g. the 2467 or 2465A, so fitting a slim 60mm case fan was about the best I could do. Even with a temperature controlled speed reduction, this was all kinds of whiney and objectionable. Rather than going this way, you might try to re-lube the motor. On my 485, which had a horribly noisy & rattling fan, I did this successfully. I first de-soldered the motor and then removed the thrust bearing at the back of it. This allowed me access at both ends (bushings) of the motor. I then flushed the motor with isopropyl alcohol a couple of times to get decades of ick and crusted up oil out. I then lubed the bearings with a drop of 30W synthetic motor oil. This seems to have restored it to wonderful, near-silent operation.
|
Re: Looking for a 335 CRT
One reason why I stopped shipping scopes.? I never had a problem/failure, but it was only a matter of time.
-Dave
toggle quoted message
Show quoted text
On Tuesday, April 6, 2021, 07:57:37 AM PDT, Paul Amaranth <paul@...> wrote: That happened to me too a few years back.? The tube didn't break but suffered enough shock to misalign something so a horizontal trace looked like a check mark. ? Paul On Mon, Apr 05, 2021 at 08:24:40PM -0700, Sscandizzo@... wrote: Hi Folks,
Just picked up a Sony/Tek 335 from you know where. Included probes, case, and original manual. Even showed traces in the photos. Unfortunately, good ole' USPS delivered it. When I powered it up, the LED lit, but no traces. Followed the manual to get everything set to defaults for testing. No traces. Leaned the thing forward, heard a slight "tinkle" and the screen lit all green. Looking closer, I could see a shadow moving around in the tube of something. about 1mm x 3mm.
Not faulting the seller, but no insurance on "Parts only" items. Apparently, the parts aren't worth anything either? Anywho, anyone out there with a parts 335 willing to part with a tube?
Thanks for listening to my rant.
-S
!DSPAM:606bd483283321901920555!
-- Paul Amaranth, GCIH? ? ? ? ? ? | Manchester MI, USA? ? ? ? ? ? ? Aurora Group of Michigan, LLC? |? Security, Systems & Software paul@...? ? ? ? ? ? ? |? Unix/Linux - We don't do windows
|
Re: Early 465 CRT "mesh" or "Post Accelerator Grid".
Dave,
I don¡¯t seem to find your last message. But you were asking me something regarding removing the back to take a picture of the CRT pins, correct?
Could you refresh my memory?
|
Re: Sphere's 2021 Stuff Season is officially open....
Hi Walter,
I skimmed your page and saw the lovely 515A.
While I am unfortunately not in a position to store or use the scope, I
_do_ happen to have the paper manual for it. I have it for scanning for
Tekwiki but I don't need to keep it beyond that and it should accompany
the instrument.
Perhaps you can advise the buyer they can contact me if they want the
manual.
best
--Toby
|
Re: Looking for a 335 CRT
|
Looking for AM5030 Current Probe Amplifier
Hi,
I'm looking for an AM5030 Current Probe Amplifier (Basically an AM503B with GPIB), with shipping to Japan.
If anyone has one they want to get rid of at a reasonable price, let me know. :)
Thanks!
|
Re: Looking for a 335 CRT
That happened to me too a few years back. The tube didn't break but suffered enough
shock to misalign something so a horizontal trace looked like a check mark.
Paul
toggle quoted message
Show quoted text
On Mon, Apr 05, 2021 at 08:24:40PM -0700, Sscandizzo@... wrote: Hi Folks,
Just picked up a Sony/Tek 335 from you know where. Included probes, case, and original manual. Even showed traces in the photos. Unfortunately, good ole' USPS delivered it. When I powered it up, the LED lit, but no traces. Followed the manual to get everything set to defaults for testing. No traces. Leaned the thing forward, heard a slight "tinkle" and the screen lit all green. Looking closer, I could see a shadow moving around in the tube of something. about 1mm x 3mm.
Not faulting the seller, but no insurance on "Parts only" items. Apparently, the parts aren't worth anything either? Anywho, anyone out there with a parts 335 willing to part with a tube?
Thanks for listening to my rant.
-S
!DSPAM:606bd483283321901920555!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix/Linux - We don't do windows
|
Re: Re;Tektronix S-4 Head
Be warned that triggering the 7T11 can be tricky to say the least - it often takes me ages to get a well triggered trace. If internal triggering isn't working, try using external triggering.
Also can you trigger at lower sweep speeds (on say a 10kHz, 100kHz or 1MHz signal)?
David
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Albert Otten Sent: 06 April 2021 10:32 To: [email protected]Subject: Re: [TekScopes] Re;Tektronix S-4 Head What means without success? I think you'd better be more specific yourself about settings, cabling and the like. Is this combo working correctly with another sampling head? Or at lower frequencies? If this is completely new for you then please have a look at the Operating sections in the 7T11 and S-4 instruction manuals. Albert On Tue, Apr 6, 2021 at 09:39 AM, MARC CHRISTIAN wrote:
Dear Tektronix Group.
Attempting to Test a Tektronix S-4 Sampling Head but
without Success !! Tektronix 7S11 + S-4 Head placed in Tektronix 7854 4-Slot
Mainframe (Right Vertical)
And Tektronix 7T11A placed in (A Horizontal) - With No User Manuals it¡¯s
proofing difficult to Display a meaningful result with a 1 GHz Source.
Any assistance very welcome and more so with Switch Settings and
Interpretation of Results.
Many thanks,
Marc Christina
|
Re: Re;Tektronix S-4 Head
What means without success? I think you'd better be more specific yourself about settings, cabling and the like. Is this combo working correctly with another sampling head? Or at lower frequencies? If this is completely new for you then please have a look at the Operating sections in the 7T11 and S-4 instruction manuals.
Albert
toggle quoted message
Show quoted text
On Tue, Apr 6, 2021 at 09:39 AM, MARC CHRISTIAN wrote:
Dear Tektronix Group.
Attempting to Test a Tektronix S-4 Sampling Head but
without Success !! Tektronix 7S11 + S-4 Head placed in Tektronix 7854 4-Slot
Mainframe (Right Vertical)
And Tektronix 7T11A placed in (A Horizontal) - With No User Manuals it¡¯s
proofing difficult to Display a meaningful result with a 1 GHz Source.
Any assistance very welcome and more so with Switch Settings and
Interpretation of Results.
Many thanks,
Marc Christina
|
Dear Tektronix Group.
Attempting to Test a Tektronix S-4 Sampling Head but without Success !! Tektronix 7S11 + S-4 Head placed in Tektronix 7854 4-Slot Mainframe (Right Vertical)
And Tektronix 7T11A placed in (A Horizontal) - With No User Manuals it¡¯s proofing difficult to Display a meaningful result with a 1 GHz Source.
Any assistance very welcome and more so with Switch Settings and Interpretation of Results.
Many thanks,
Marc Christina
|
Re: Looking for a 335 CRT
You should fault the seller for probably a terrible packing job.
|
Dave Peterson
satbeginner
Raymond Domp Frank
Jared Cabot
David C. Partridge