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Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace
Have you considered making your own? 1/8" phenolic or fiberglass epoxy sheet is cheap on Ebay, along with various sizes of round acrylic plastic disks. Thread some brass rod, and tap holes in the insulator of you choice. A nut on the reverse side will keep it secure.
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If there is enough interest, I could build a batch of them. I have 7 pin, 9 pin, and other tubes to use as models. I may still have some of the rare 10 in, which is a nine pin plus a single center pin which was used for some mixer applications. Noval and Compactron bases can be made the same way. I will be making some four pin plugs the make connectors for some obsolete batteries this way. The fun part is that the battery has the male pins, with 90VDC on two of the pins so I will add a switch to disable it until the plug is seated into the recessed connector. Here is a scan of an old Amphenol catalog that contains older tube sockets for your reference: http://www.tubebooks.org/file_downloads/Amphenol.pdf
-----Original Message-----
From: "'Dennis Tillman' dennis@ridesoft.com [TekScopes]" <TekScopes@yahoogroups.com> Michael A. Terrell
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Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace
butchwhitt@...
https://tubedepot.com/products/9-pin-socket-saver https://tubedepot.com/products/9-pin-socket-saver
This place has the 9 pin socket saver and a lot of other things including an 8 pin and converter. Hope this helps! First time posting... Long time learning here. Butch
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Re: CORRECTED POST : Tek 2445 vs Tek 2430A (Tek 2435A)
cmjones01
On Mon, Mar 27, 2017 at 4:14 AM, houdatto@gmail.com [TekScopes] <
TekScopes@yahoogroups.com> wrote: I think 2445s were always less common than their big brother, the 2465. I've seen lots and lots of 2465x in my career, including the three I own, but rarely a 2445. 2430 and 2430A DSOs were also fairly common. I suspect the difference in price and availability today is down to demand for what they are. A 2445 is a really good modern analogue scope, and does the things that people want from a good analogue scope, so they fetch high prices and sell quickly. You just can't buy a good new analogue scope any more. A 2430A is a very old DSO and looks pretty poor in many respects compared with the competition from a few years later or from new Chinese scopes. I've got one, and I use it, and it works well for me, and gives me a faint nostalgia for the days when a 2430 was the only DSO available in the lab and I had to ask special permission from the manager to use it, getting it out of a locked cupboard. But would I recommend someone to buy one today? Probably not. Hence why they no longer fetch high prices. Chris
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Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace
Ed Breya
Hey Dennis, this just occurred to me - if you can't find any off-shelf miniature tube style plugs, how about just cutting some pin stock to make them extra long, and jam them into a socket to form a male plug assembly. You should be able to solder the pins to the lugs on this socket, or epoxy it up to keep it together.
It would effectively start as a female-female adapter, with the loose pins joining two sockets face to face - one as an alignment jig, and the other to become the plug assembly once the pins are bonded to it somehow. Any base style that has reverse-axial symmetry could have plugs made in this way. Ed
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Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace
Dave Brown <tractorb@...>
Dennis
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How many of the 7 and 9 pin plugs do you need? Are you looking for a significant number? 73 Dave, ZL3FJ
-----Original Message-----
From: TekScopes@yahoogroups.com [mailto:TekScopes@yahoogroups.com] Sent: Monday, March 27, 2017 3:46 PM To: TekScopes@yahoogroups.com Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace Hi Bill, In my case I needed tube PLUGS that would plug into a tube SOCKET. That is my problem. I am well aware of Tubesandmore. They certainly have a nice selection of 4 pin, 5 pin, 7 pin, 8 pin , and 9 pin tube SOCKETS. Unfortunately other than 8 pin tube PLUGS they, or anyone else for that matter, do not sell 7 pin miniature tube PLUGS or 9 pin miniature PLUGS. Since 7 pin miniature tubes and 9 pin miniature tubes have their pins coming right out of the glass envelope this will make it very hard to get what I need by smashing spent tubes to try and get an intact set of pins around the base of the tube. As John Gord pointed out one way to find some of these is by searching for socket savers. They, too, are scarce these days. Not many people are designing things with tubes. There was a 9 pin and a 7 pin socket saver auction on Ebay and I bid $28 for them but someone outbid me. I have no way to know how high that person's ultimate bid might have been. Dennis Tillman, W7PF -----Original Message----- Sent: Sunday, March 26, 2017 5:08 PM Subject: Re: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace Dennis and all, Has everyone been overlooking the best source for tubes and related hardware? https://www.tubesandmore.com/products/tube_accessories Bill KB3DKS -----Original Message----- From: 'Dennis Tillman' dennis@ridesoft.com [TekScopes] <TekScopes@yahoogroups.com> Sent: Wed, Mar 22, 2017 10:06 am Hi John, Thanks for the suggestion. I know I kept coming across octal socket savers all the time but I never saw a 7 pin or 9 pin socket saver. I will give that a try. Dennis Tillman W7PF -----Original Message----- Sent: Tuesday, March 21, 2017 5:06 PM Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace Try a Google search for "7 pin socket saver". I got some hits. 9 pin socket savers seem to be more common. It looks like at least some of the socket savers could be disassembled. --John Gord ------------------------------------ Posted by: Doxemf <doxemf@aol.com> ------------------------------------ ------------------------------------ Posted by: "Dennis Tillman" <dennis@ridesoft.com> ------------------------------------ ------------------------------------ Yahoo Groups Links
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Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace
stuff that disappears does so for a reason. Maybe you just simply
don't get tubes with that base that are any interesting at all. No point trying to accumulate stuff that's boring other than it has a specific pinout. On Mon, Mar 27, 2017 at 6:56 AM, 'Dennis Tillman' dennis@ridesoft.com [TekScopes] <TekScopes@yahoogroups.com> wrote: Hi Cheater,
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Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace
Hi Cheater,
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In a pinch I did make a 9 pin plug using 0.040" bus bar pushed into an existing 9 pin socket, with a piece of PVC tubing around it, and I potted the entire thing. What you get is crude, and it takes a fair amount of time to do this. So this is hardly a reasonable solution except in a pinch. I was hoping for something that was much more professional and took far less time. I don't mind paying $10 for a plug that I can order from somewhere. Some of the tube stuff seems to have disappeared, and other stuff seems to be doing just fine. I haven't figured out which stuff is rare that I should jump at them whenever they show up versus the stuff that is still very common and still being produced. I'm new to the whole tube world. Last time I touched a vacuum tube was 40+ years ago until very recently. Dennis Tillman W7PF
-----Original Message-----
Sent: Sunday, March 26, 2017 9:29 PM Subject: Re: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace Am I missing something... why not just take a bare FR board and drill some holes in it.. use two boards for rigidity... and pot the whole job? On Mon, Mar 27, 2017 at 5:42 AM, Doxemf doxemf@aol.com [TekScopes] <TekScopes@yahoogroups.com> wrote: Dennis,------------------------------------ Posted by: cheater00 cheater00 <cheater00@gmail.com> ------------------------------------
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Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace
Am I missing something... why not just take a bare FR board and drill
some holes in it.. use two boards for rigidity... and pot the whole job? On Mon, Mar 27, 2017 at 5:42 AM, Doxemf doxemf@aol.com [TekScopes] <TekScopes@yahoogroups.com> wrote: Dennis,
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Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace
Bill (Doc) Courtright
Dennis,
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They have the 9 pin Socket Savers. I did not see any 7 pin. Quite awhile ago there were some cheap car stereo players, maybe eve 8 tracks, I forget, I serviced them once. Anyway, they used a 9 pin male/female connector. I think that the old Calrad or similar brand offered the cable sets. Fair Radio used to have some as well. Someone with a 3D printer could probably spit a bunch out that way. Just have to provide the pins. Bill, KB3DKS
-----Original Message-----
From: 'Dennis Tillman' dennis@ridesoft.com [TekScopes] <TekScopes@yahoogroups.com> To: TekScopes <TekScopes@yahoogroups.com> Sent: Sun, Mar 26, 2017 10:46 pm Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace Hi Bill, In my case I needed tube PLUGS that would plug into a tube SOCKET. That is my problem. I am well aware of Tubesandmore. They certainly have a nice selection of 4 pin, 5 pin, 7 pin, 8 pin , and 9 pin tube SOCKETS. Unfortunately other than 8 pin tube PLUGS they, or anyone else for that matter, do not sell 7 pin miniature tube PLUGS or 9 pin miniature PLUGS. Since 7 pin miniature tubes and 9 pin miniature tubes have their pins coming right out of the glass envelope this will make it very hard to get what I need by smashing spent tubes to try and get an intact set of pins around the base of the tube. As John Gord pointed out one way to find some of these is by searching for socket savers. They, too, are scarce these days. Not many people are designing things with tubes. There was a 9 pin and a 7 pin socket saver auction on Ebay and I bid $28 for them but someone outbid me. I have no way to know how high that person's ultimate bid might have been. Dennis Tillman, W7PF -----Original Message----- Sent: Sunday, March 26, 2017 5:08 PM Subject: Re: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace Dennis and all, Has everyone been overlooking the best source for tubes and related hardware? https://www.tubesandmore.com/products/tube_accessories Bill KB3DKS
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Re: 7912AD Repair
Bill Higdon
Should have been down not sown
Bill
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Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace
Hi Bill,
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In my case I needed tube PLUGS that would plug into a tube SOCKET. That is my problem. I am well aware of Tubesandmore. They certainly have a nice selection of 4 pin, 5 pin, 7 pin, 8 pin , and 9 pin tube SOCKETS. Unfortunately other than 8 pin tube PLUGS they, or anyone else for that matter, do not sell 7 pin miniature tube PLUGS or 9 pin miniature PLUGS. Since 7 pin miniature tubes and 9 pin miniature tubes have their pins coming right out of the glass envelope this will make it very hard to get what I need by smashing spent tubes to try and get an intact set of pins around the base of the tube. As John Gord pointed out one way to find some of these is by searching for socket savers. They, too, are scarce these days. Not many people are designing things with tubes. There was a 9 pin and a 7 pin socket saver auction on Ebay and I bid $28 for them but someone outbid me. I have no way to know how high that person's ultimate bid might have been. Dennis Tillman, W7PF
-----Original Message-----
Sent: Sunday, March 26, 2017 5:08 PM Subject: Re: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace Dennis and all, Has everyone been overlooking the best source for tubes and related hardware? https://www.tubesandmore.com/products/tube_accessories Bill KB3DKS -----Original Message----- From: 'Dennis Tillman' dennis@ridesoft.com [TekScopes] <TekScopes@yahoogroups.com> Sent: Wed, Mar 22, 2017 10:06 am Hi John, Thanks for the suggestion. I know I kept coming across octal socket savers all the time but I never saw a 7 pin or 9 pin socket saver. I will give that a try. Dennis Tillman W7PF -----Original Message----- Sent: Tuesday, March 21, 2017 5:06 PM Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace Try a Google search for "7 pin socket saver". I got some hits. 9 pin socket savers seem to be more common. It looks like at least some of the socket savers could be disassembled. --John Gord ------------------------------------ Posted by: Doxemf <doxemf@aol.com> ------------------------------------
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CORRECTED POST : Tek 2445 vs Tek 2430A (Tek 2435A)
I have 3 Tek 2445 scopes and one Tek 2430A scope. While idly bumming around eBay, I noticed that it seemed to me the 2445s were less common and on average more expensive than the 2430As. Seeing as how the 2430A is a DSO and the 2445 is analog I would have expected the opposite. Am I wrong in this thinking or am I missing something?
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Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace
Bill (Doc) Courtright
Dennis and all,
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Has everyone been overlooking the best source for tubes and related hardware? https://www.tubesandmore.com/products/tube_accessories Bill KB3DKS
-----Original Message-----
From: 'Dennis Tillman' dennis@ridesoft.com [TekScopes] <TekScopes@yahoogroups.com> To: TekScopes <TekScopes@yahoogroups.com> Sent: Wed, Mar 22, 2017 10:06 am Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace Hi John, Thanks for the suggestion. I know I kept coming across octal socket savers all the time but I never saw a 7 pin or 9 pin socket saver. I will give that a try. Dennis Tillman W7PF -----Original Message----- Sent: Tuesday, March 21, 2017 5:06 PM Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace Try a Google search for "7 pin socket saver". I got some hits. 9 pin socket savers seem to be more common. It looks like at least some of the socket savers could be disassembled. --John Gord
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Re: Tek 2445 vs Tek 2435A
Chuck Harris
The 150MHz 2445 came out concurrent with the 300MHz 2465,
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costing $3250 vs the 2465's $4750. Double the performance, and only a third more in price. More the wonder is why any sold at all? -Chuck Harris houdatto@gmail.com [TekScopes] wrote:
I have 3 Tek 2445 scopes and one Tek 2435A scope. While idly bumming around eBay,
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Re: 7912AD Repair
Bill Higdon
The Little Mountain part/Annex of Hill AFB has an interesting history. originally it was a specially built wind tunnel for testing the Ramjet engines for the Bomarc. After that program shut sown it was dormant for a period of time until the Air Force realized they needed to move the High energy X Ray system to some place where the particle beams didn't have a chance of hitting people like they did when they were on Hill AFB proper. So they moved them to the Little Mountain facility. They're on the west side of the the mountain, follow the road past Moulding and sons landfill.
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Re: Intro & Tek 2235 - Momentary trace only with dim bulb tester
A Rob
Voltages at Q114 & Q115 stay exactly the same when switching between ch1 & ch2.
I have double checked voltages and there is a slight difference to what I'd previously reported: U130 Pin 13 1.97 Volts Selected U130 Pin 13 2.79 Volts Not Selected U130 Pin 9 2.49 Volts Selected U130 Pin 9 2.78 Volts Not Selected U130 Pin 7 0.00 Volts Selected U130 Pin 7 -0.01 Volts Not Selected U130 Pin 14 0.74 Volts Selected U130 Pin 14 -0.59 Volts Not Selected R143 is reading as 98.62ohm in circuit L143 is reading 0.01ohm in circuit
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Re: 2465 Vertical Gain
Chuck Harris
The 2465B stores all of the offsets, and gain changes necessary
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to make the scope in calibration in the NVRAM that is on the A5 board. The only adjustment pots are in places where a resistor must be a resistor, not a computer generated voltage. It takes a full vertical recalibration to fix your problem. -Chuck Harris greg_knox@bellsouth.net [TekScopes] wrote:
The CH 2 vertical gain on my 2465b is a few percent off, relative to the CH 1
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Re: 7912AD Repair
Roger Evans
Chris,
The digitised output only appears on the XYZ connectors, I use a 485 in XY mode and found that the Z connection did not add anything useful. When I press the digital button. Tha analogue monitor goes black and two seconds later the digitised signal appears on the XY monitor. Subsequently pressing the digital button gives a new digitised trace immediately. The manual says the first two second delay is to allow voltages to stabilise. The same thing happens when you give commands via GPIB. I have a home made USB to GPIB interface and can store data and view images on a PC. Apart from the elation of getting the 7912 to work there is now the question of what to do with the enormous box in the corner! Roget
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Re: 7912AD Repair
cmjones01
On Sun, Mar 26, 2017 at 9:04 PM, very_fuzzy_logic@yahoo.com [TekScopes] <
TekScopes@yahoogroups.com> wrote: amplifier wasn't working due to, you've guessed it, yet another short-circuit tantalum on the -15V rail which had taken out its 10R decoupling resistor. I replaced both and the remaining tants on that board, and now I have a proper scan, with graticule and waveform! The focus control on the front panel has little effect on my 7912AD, thevery similar way: when it's not optimally set, the trace and graticule look a bit dim and ill-defined rather than fuzzy in the way they would on a standard analogue scope. I can get a sharp trace and graticule with the focus control at mid position and experience the blooming if I crank up either intensity too much. What I was seeing before was *all* blooming because I had no X read scan! Sounds like you should have a working 7912 soon!Yes, I think we're almost there. I'm not sure if the digitiser is working properly. I have a monitor connected to the linear TV out (the binary one also works but is harder to use for adjusting everything). I can see the trace and graticule. There seems to be some hum on the trace but that could be due to an earth loop and having the cases off everything. When I press the 'digital' button the screen goes white. I read in the manual this morning that a digitisation takes 2 seconds, and so I should probably be more patient: presumably I should see the frozen waveform on the monitor after that. I haven't tried the XYZ output yet. I do have a full 'doorstep' set of paper manuals, thanks to a fortuitous visit to Manuals Plus a week or so before they closed down. They're labelled 'Hill AFB - Little Mountain', so I bet they could tell a few stories. Chris
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Re: 7912AD Repair
Roger Evans
Chris,
The fastest sweep speeds need the x10 magnifier so you will have an apparently wide scan. On the 7B90P there is a 'mag' led that comes on. The graticule should show 10 x 8 equal squares so that would confirm that the read scan size is correct. The focus control on the front panel has little effect on my 7912AD, the spot blooms very quickly if the brightness is too high but is sharp at the lowest usable intensity. The Z axis amplifier is driven differently for the graticule and the sweep and mine struggles to show sharp trace and graticule at the same time. For serious use you would digitise the graticule separately, I believe the software is supposed to calculate the centroid of each graticule spot. The required intensity for a good trace varies a lot with sweep speed and rep rate. Also the cpu will limit the maximum Z axis drive at lower sweep speeds, I would try making small adjustments to the Grid Bias to get good results for a repetitive 10ns/div sweep with no more than one turn of the write intensity pot. You should then be able to digitise single sweeps with the intensity turned right up. There is a formal Z axis calibration but I have slightly low output from the Z amplifier so I opted for the trial and error approach. I would strongly recommend turning the intensity right down before you turn the 7912 on as a matter of habit. Sounds like you should have a working 7912 soon! Regards, Roger
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