Re: 7603 horizontal performance
Thank you for confirming, Dave!
And I agree with you that it's bad etiquette to hi-jack a thread; no matter what was my reason it was wrong. I regret it and I apologize to all that were offended by my action.
TT
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Thanks to all for the great interest this has started and for more than interesting information presented. Great, great article at antiqueradios; whoever's ready for that work, good luck!
Not going to work for me, as part of the bushing holder is broken and I think that's no repairable. I believe somebody mentioned the fan for 2465A(B?) or 2467 with driver circuit with an NTC; I didn't find than NTC in schematic, maybe I don't have the right one... The idea of a regular fan with that (thermal) controller (or another, maybe from a 2465 modified for the need) is attractive (I have some fans of high reliability).
Thanks all for thoughts
TT
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On Thu, Apr 8, 2021 at 06:55 PM, Raymond Domp Frank wrote:
Common Design Parts Catalog 1, August 1979, "Semiconductors", lists lamps in
chapter 15.
Tekwiki link: Raymond
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Great info. If you can get the bearings/bushes in hand first, it might be an idea to go for it. You can always buy the magnet wire easily. The fun is getting it working like when it came originally!
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Except for Instruments Used In, the info is already available in Section 15 of Common Design Parts Catalog ¨C Semiconductors. Dave Wise From: [email protected] [mailto: [email protected]] On Behalf Of greenboxmaven via groups.io Sent: Thursday, April 08, 2021 9:47 AM To: [email protected]Subject: Re: [TekScopes] TEK CX ref lamps If someone does this very desirable and valuable work, and any other for that matter, PLEASE! provide the option of receiving it in PDF form. Thanks, Bruce Gentry, KA2IVY On 4/8/21 12:40, Jean-Paul wrote: Hello all: Seeking a cross ref of all Tektronix lamps
TEK part # like 150-0090-00
spec volts, current, envelope
instrument used in,
industry lamp type #
Would be very handy! If it does not exist perhaps one of our members could help to compile in easily exchangeable form eg Excel XLS?
Bon Journee,
Jon
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On Thu, Apr 8, 2021 at 06:40 PM, Jean-Paul wrote:
Hello all: Seeking a cross ref of all Tektronix lamps
TEK part # like 150-0090-00
spec volts, current, envelope
instrument used in,
industry lamp type #
Would be very handy! If it does not exist perhaps one of our members could
help to compile in easily exchangeable form eg Excel XLS?
Common Design Parts Catalog 1, August 1979, "Semiconductors", lists lamps in chapter 15. Raymond
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If someone does this very desirable and valuable? work, and any other for that matter, PLEASE! provide the option of receiving it in PDF form. Thanks,
??? Bruce Gentry, KA2IVY
toggle quoted message
Show quoted text
On 4/8/21 12:40, Jean-Paul wrote: Hello all: Seeking a cross ref of all Tektronix lamps
TEK part # like 150-0090-00
spec volts, current, envelope
instrument used in,
industry lamp type #
Would be very handy! If it does not exist perhaps one of our members could help to compile in easily exchangeable form eg Excel XLS?
Bon Journee,
Jon
|
Hello all: Seeking a cross ref of all Tektronix lamps
TEK part # like 150-0090-00
spec volts, current, envelope
instrument used in,
industry lamp type #
Would be very handy! If it does not exist perhaps one of our members could help to compile in easily exchangeable form eg Excel XLS?
Bon Journee,
Jon
|
Switch for Jared's TM500 tester
The Grayhill 71BDF30-20-2-AJN multi-way switch(Digikey GH7108-ND) is out of stock at Digikey ?
Mouser has a few (16) and lead time is 16 weeks.
Master Electronics, Electrosonic, and Verical also have limited stock (14 or 15).
David
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Re: Early 465 CRT "mesh" or "Post Accelerator Grid".
HP did in fact resistor color code to identify some ribbon codes per the sockets, but more prominently used them to mark the small jumper cable (SMB, SMC, and some SMA cables inside the units ( ie. 8566A/B, 8568A/B, 8340/41 A/B). The plastic sheath was coded for the cable ref designation. This was done during the 1970¡®s and early 1980¡¯s. As the price of these jumper cables increased, they shifted to using grey sheathed cables with paint dots to indicate which connector it mated to, they finally switched to 2 digit numeric wire markers to indicate the connector.
Don Bitters
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Re: 454 Fireworks Followup to the Followup
Interesting...however, since my last message, I discovered three blitzed transistors in the vertical amp, Q388, Q394 and Q494. Those all could have gotten damaged by the 75V going way too high.
Sean
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On Wed, Apr 7, 2021 at 05:15 PM, Michael W. Lynch wrote:
Sean,
I have not worked on a 453, but the symptoms you mention have appeared in
various 465 475 and 485 scopes that I have repaired. A majority of these had
issues with the beam finder switches or circuits. My 485 had this symptom just
needed the beam finder switch cleaned to restore the trace to normal. It could
be something just that simple.
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Re: 454 Fireworks Followup to the Followup
Sean,
I have not worked on a 453, but the symptoms you mention have appeared in various 465 475 and 485 scopes that I have repaired. A majority of these had issues with the beam finder switches or circuits. My 485 had this symptom just needed the beam finder switch cleaned to restore the trace to normal. It could be something just that simple.
--
Michael Lynch
Dardanelle, AR
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Re: 454 Fireworks Followup to the Followup
I forgot to add, any signal gets squished down when moved to the extremes as well.
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On Wed, Apr 7, 2021 at 03:36 PM, Sean Turner wrote:
2) Vertical positioning is wonky, with the trace remaining on the screen even
at the extremes of the position controls. (I believe this may be related to
the point above)
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Re: 454 Fireworks Followup to the Followup
So this evening I am attempting to run through the cal procedure. In attempt to document this repair to help anyone else who might be working on one, I have identified three things which aren't correct (and might be interrelated):
1) Vertical gain is very low, by about a factor of five I'd say. The cal procedure for adjusting vertical gain calls for a 100 mV p-p square wave, and the volts/div set at 20 mV, which should give a five division trace. I get less than two divisions.
2) Vertical positioning is wonky, with the trace remaining on the screen even at the extremes of the position controls. (I believe this may be related to the point above)
3) The sweep is perfectly linear but about half a division short.
I'm wondering if I should be looking for damage from the +75 going high when the regulator shorted out. Anyone else experience these problems before?
Sean
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Good point, I forgot your 1S1 is already 50 ohms. What is the period of that ringing? That may help locate something that's the right electrical length. Track on the probe PC board maybe?
I agree, no way should an SMA connector cause that kind of aberration.
I want a TinySA too :)
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On Wed, Apr 7, 2021 at 1:39 PM adesilva_1999 via groups.io <adesilva_1999= [email protected]> wrote: If it is a bush bearing, is it not possible to turn one out using phosphor
bronze? If you are near a machine shop, it might be an idea to show them
and see how much they would charge.
The problem is that it appears the stator is wound around the rotor, encapsulating the bearings within the stator. Matt D'Asaro wrote an article on how to replace the bearings on one of those, and it involves essentially a full motor rewind: . Be patient and this will/may load from archive.org, as unfortunately the original article references now-dead image links :/.
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Re: Early 465 CRT "mesh" or "Post Accelerator Grid".
That's good to know- I don't think I've heard that before.
-Dave
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On Wednesday, April 7, 2021, 11:02:10 AM PDT, Dave Wise <david_wise@...> wrote: At least in the old days (500 series), if the wire is carrying a supply rail, it's color-coded with an approximation of the voltage.? Examples: -150V is black with brown and green stripes; +225 is white with two red stripes. Dave Wise From: [email protected] [mailto: [email protected]] On Behalf Of Paul Amaranth via groups.io Sent: Wednesday, April 07, 2021 9:39 AM To: [email protected]Subject: Re: [TekScopes] Early 465 CRT "mesh" or "Post Accelerator Grid". I finally realized a couple months ago that the colors on multicolored ribbon cable actually meant something other than just identifying separate wires. Standard resistor color code, duh. Start with brown on pin 1 and you're golden. The color coding on Tek wiring is very useful, particularly if you have to pull a board for some reason. Inventory must have been a headache though. I've had some equipment where all the wires are black and, if you're lucky, there may be an ID printed in 2 point type in white ink that may or may not be readable. Paul On Wed, Apr 07, 2021 at 12:27:08PM -0400, n4buq wrote: I agree with Michael. I always looked at the striping as just a means of identifying a wire from one end of a cable to the other and hadn't thought about the color codes indicating a pin number, etc.
I know HP usually notated the stripes on the schematics and that also helps troubleshooting but not sure if any of those correspond to anything such as a pin number, etc., on the boards. I'll have to remember to take a closer look at that the next time I have one of them open and see if I can determine any correlation.
Thanks,
Barry - N4BUQ
Time to give away another secret:
The wire actually is white, with a brown and a red stripe. Guess why?
Raymond
Raymond,
When I read your comments, such as above, I realize just how little I
actually know. Thank you for sharing your knowledge with us. I will never
look at those wires and stripes the same way, going forward.
Sincerely,
--
Michael Lynch
Dardanelle, AR
!DSPAM:606ddd6748531196043745!
-- Paul Amaranth, GCIH | Manchester MI, USA Aurora Group of Michigan, LLC | Security, Systems & Software paul@... | Unix/Linux - We don't do windows
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McMaster Carr has 946 different sizes of Oil-Embedded Sleeve Bearings. One might fit with minor adjustments.
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Re: Early 465 CRT "mesh" or "Post Accelerator Grid".
At least in the old days (500 series), if the wire is carrying a supply rail, it's color-coded with an approximation of the voltage. Examples: -150V is black with brown and green stripes; +225 is white with two red stripes. Dave Wise From: [email protected] [mailto: [email protected]] On Behalf Of Paul Amaranth via groups.io Sent: Wednesday, April 07, 2021 9:39 AM To: [email protected]Subject: Re: [TekScopes] Early 465 CRT "mesh" or "Post Accelerator Grid". I finally realized a couple months ago that the colors on multicolored ribbon cable actually meant something other than just identifying separate wires. Standard resistor color code, duh. Start with brown on pin 1 and you're golden. The color coding on Tek wiring is very useful, particularly if you have to pull a board for some reason. Inventory must have been a headache though. I've had some equipment where all the wires are black and, if you're lucky, there may be an ID printed in 2 point type in white ink that may or may not be readable. Paul On Wed, Apr 07, 2021 at 12:27:08PM -0400, n4buq wrote: I agree with Michael. I always looked at the striping as just a means of identifying a wire from one end of a cable to the other and hadn't thought about the color codes indicating a pin number, etc.
I know HP usually notated the stripes on the schematics and that also helps troubleshooting but not sure if any of those correspond to anything such as a pin number, etc., on the boards. I'll have to remember to take a closer look at that the next time I have one of them open and see if I can determine any correlation.
Thanks,
Barry - N4BUQ
Time to give away another secret:
The wire actually is white, with a brown and a red stripe. Guess why?
Raymond
Raymond,
When I read your comments, such as above, I realize just how little I
actually know. Thank you for sharing your knowledge with us. I will never
look at those wires and stripes the same way, going forward.
Sincerely,
--
Michael Lynch
Dardanelle, AR
!DSPAM:606ddd6748531196043745!
-- Paul Amaranth, GCIH | Manchester MI, USA Aurora Group of Michigan, LLC | Security, Systems & Software paul@... | Unix/Linux - We don't do windows
|
On Wed, Apr 7, 2021 at 07:39 PM, <adesilva_1999@...> wrote:
If it is a bush bearing, is it not possible to turn one out using phosphor
bronze? If you are near a machine shop, it might be an idea to show them and
see how much they would charge.
Never tried. I might still do that, motors still in a box, I think. Thanks for the suggestion! Raymond
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Raymond Domp Frank
Jean-Paul
David C. Partridge
Michael W. Lynch