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Re: 7K Programmable Plugin photos
Catnip is a better way to describe it. It doesn't have the negative connotations.
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Dennis Tillman W7PF -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Jim Ford Sent: Tuesday, August 13, 2019 9:14 AM To: [email protected] Subject: Re: [TekScopes] 7K Programmable Plugin photos And you said you don't like to brag about your collection, Dennis! This is like porn for us Tekheads! Jim Ford Sent from my Verizon, Samsung Galaxy smartphone -----Original Message----- From Dennis Tillman W7PF Sent: Tuesday, August 13, 2019 8:44 AM Thanks to help from members of the forum I have all of the 7K Programmable plugins working in 4-wide mainframes. These are the four programmable plugins Tek designed: * 7A16P 200MHz Single Trace Programmable Amplifier, with selectable 50 ohm or 1Mohm input impedance. * 7A29P 750MHz Single Trace 50 ohm Programmable Amplifier * 7B81P 1nSec Programmable Delaying Timebase (not released to production) * 7B90P 500pSec Programmable Timebase I have all four, but the 7B81P, which was only built as a prototype, is only partially working. Each one has a very pretty lit push button user interface that looks stunning when you fill a mainframe with them. They work with each other or any conventional 7K plugins so you can mix and match them with plugins you already have. For the photos I took for this album I chose to fill the mainframe with combinations of only the programmable plugins. The photos are in the TekScopes Photo section at: /g/TekScopes/album?id=94185 Dennis Tillman W7PF PS I have a few extra 7A16P plugins so if anyone is interested in one CONTACT ME OFF -LIST at dennis at ridesoft dot com -- Dennis Tillman W7PF TekScopes Moderator |
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Re: 7K Programmable Plugin photos
Hi John,
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No nothing else is needed if all you want to do is be able to use the front panel pushbuttons to program the 7A16P plugin manually. If you mean is the 7A16P programmable via the 7854 GPIB Interface? I believe the answer is that the 7854 GPIB interface of the 7854 does not talk to the programmable plugins but I have not investigated this myself. If I am not mistaken, in order to actually program the plugins in any of the 7K 4-wide mainframes other than the 7612 and 7912 digitizers they were designed for you have to have a 021-0374-00 GPIB Decoder 7K plugin installed in the mainframe. The expert on this is Holger Lubbin. He would be able to answer that question. Dennis Tillman W7PF -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of John Griessen Sent: Tuesday, August 13, 2019 8:52 AM On 8/13/19 10:43 AM, Dennis Tillman W7PF wrote: They work with each other or any conventional 7K plugins so you canIs there anything needed to use a 7A16P in a 7854? -- Dennis Tillman W7PF TekScopes Moderator |
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Re: non-gumming oil (was: 547 Fan lubrication) OT
Chuck Harris
The red 3-in-1 is a perfumed kerosene diluted motor oil.
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It was meant for use by people who couldn't tolerate the yucky sulfur smells of oil... wanted something pretty. It was used mostly for unsticking squeaky door hinges, and old warded locks. It got used on way more than it should have. When the kerosene eventually evaporates, the old thick base oil remains... which seems pretty thick and gummy. The blue 3-in-1 oil is good... but way too expensive for what it is. You are buying the name and the metal can. -Chuck Harris EricJ via Groups.Io wrote: There's a specific 3-in-1 that does not gum up. It comes in the blue bottle. The stuff in the red bottle will gum up and get sticky over time, the stuff in the blue bottle won't. I learned this from antique desk fan guys. |
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Re: non-gumming oil (was: 547 Fan lubrication) OT
Chuck Harris
For this job, it is nearly perfect. It doesn't gum,
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and it is cheap. Is it as good as Kano??? I can't say, I have no experience with the stuff. -Chuck Harris John Griessen wrote: On 8/13/19 10:30 AM, Chuck Harris wrote:I use mobil 1 5W30... because my car uses it, and I collect the |
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Re: non-gumming oil (was: 547 Fan lubrication) OT
There's a specific 3-in-1 that does not gum up. It comes in the blue bottle. The stuff in the red bottle will gum up and get sticky over time, the stuff in the blue bottle won't. I learned this from antique desk fan guys.
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--Eric On Aug 13, 2019 10:58 AM, John Griessen <john@...> wrote:
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Re: 7K Programmable Plugin photos
And you said you don't like to brag about your collection, Dennis!This is like porn for us Tekheads!Jim FordSent from my Verizon, Samsung Galaxy smartphone
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-------- Original message --------From: Dennis Tillman W7PF <dennis@...> Date: 8/13/19 8:43 AM (GMT-08:00) To: [email protected] Subject: [TekScopes] 7K Programmable Plugin photos Thanks to help from members of the forum I have all of the 7K Programmableplugins working in 4-wide mainframes.These are the four programmable plugins Tek designed:* 7A16P 200MHz Single Trace Programmable Amplifier, with selectable 50 ohmor 1Mohm input impedance. * 7A29P 750MHz Single Trace 50 ohm Programmable Amplifier * 7B81P 1nSec Programmable Delaying Timebase (not released to production) * 7B90P 500pSec Programmable Timebase I have all four, but the 7B81P, which was only built as a prototype, is onlypartially working.Each one has a very pretty lit push button user interface that looksstunning when you fill a mainframe with them. They work with each other or any conventional 7K plugins so you can mix andmatch them with plugins you already have. For the photos I took for this album I chose to fill the mainframe withcombinations of only the programmable plugins.The photos are in the TekScopes Photo section at: /g/TekScopes/album?id=94185 Dennis Tillman W7PF PS I have a few extra 7A16P plugins so if anyone is interested in oneCONTACT ME OFF -LIST at dennis at ridesoft dot com
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Re: 7K Programmable Plugin photos
The plug ins are all usable manually in the 7854. They are not programmable
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(will not receive GPIB commands) through the 7854; they are programmable in the 7612 and 7912. There is a special GPIB plug-in (021-0374-00) which Dennis alluded to previously that adds this capability in a 7854 (or other mainframe but the manual for the 021-0374-00 says that only the 7854 has an adequate 5V supply for the whole setup). The GPIB plug-in requires a second GPIB connection at the front panel. Dave Casey On Tue, Aug 13, 2019 at 10:52 AM John Griessen <john@...> wrote:
On 8/13/19 10:43 AM, Dennis Tillman W7PF wrote:They work with each other or any conventional 7K plugins so you can mixandmatch them with plugins you already have.Is there anything needed to use a 7A16P in a 7854? |
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non-gumming oil (was: 547 Fan lubrication) OT
John Griessen
On 8/13/19 10:30 AM, Chuck Harris wrote:
I use mobil 1 5W30... because my car uses it, and I collect the Do you think synthetic motor oil is as good as Kano Microil non gumming instrument oil? I'm getting low on that oil. |
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7K Programmable Plugin photos
Thanks to help from members of the forum I have all of the 7K Programmable
plugins working in 4-wide mainframes. These are the four programmable plugins Tek designed: * 7A16P 200MHz Single Trace Programmable Amplifier, with selectable 50 ohm or 1Mohm input impedance. * 7A29P 750MHz Single Trace 50 ohm Programmable Amplifier * 7B81P 1nSec Programmable Delaying Timebase (not released to production) * 7B90P 500pSec Programmable Timebase I have all four, but the 7B81P, which was only built as a prototype, is only partially working. Each one has a very pretty lit push button user interface that looks stunning when you fill a mainframe with them. They work with each other or any conventional 7K plugins so you can mix and match them with plugins you already have. For the photos I took for this album I chose to fill the mainframe with combinations of only the programmable plugins. The photos are in the TekScopes Photo section at: /g/TekScopes/album?id=94185 Dennis Tillman W7PF PS I have a few extra 7A16P plugins so if anyone is interested in one CONTACT ME OFF -LIST at dennis at ridesoft dot com |
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Re: 547 Fan lubrication
Chuck Harris
I use mobil 1 5W30... because my car uses it, and I collect the
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drips from "empty" bottles. -Chuck Harris Morris Odell wrote: Hi all, |
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Re: 547 Fan lubrication
Chuck Harris
The bearings are oilite, which is a sintered bronze
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sponge like material. You definitely do not want to use any lube with fine particles in it, like teflon, as it will clog the pores of the oilite. To clean the old bearings, a fine brush, and a long soak in naptha works about as well as you can do. Heat causes the oil to leave the bearing, and cooling causes the oil to be sucked into the bearing, so warm them up good and hot in a puddle of light synthetic motor oil, and allow them to cool. They will be as good to go as they are going to get. The felt that is held against the bearing is there as an oil reservoir. The oil basically flows from the felt into the oilite, and forms a very thin film between the shaft and the bearing. This is why it is important that the clearance between the oilite and the shaft be only a a couple of thousandths of an inch, or so. Oilite tends to be a little abrasive when it wears, and usually the hard steel shaft will wear out before the oillite. So, if your bearing rumbles, it generally means you need a new shaft. Over oiling the bearing will just work for a few days, then the oil will go away, and the rumble will return. -Chuck Harris Dave Daniel wrote: What kind of bearings are they? |
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Re: General Radio 874 Connector, inner conductor "bendies"
Hi Dave,
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Remember Tek gold plated their PC boards until gold skyrocketed in in price in 1972 or 1973 so I think it was an easy way for Tek to "color code" the adapters so engineers would know which way to connect them. It is definitely not solid gold. Even an idiot could tell that by the weight. There would be a very big difference in mass from the non-gold end to the gold end if it were solid gold. Dennis -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Dave Seiter Sent: Monday, August 12, 2019 4:41 PM To: [email protected] Subject: Re: [TekScopes] General Radio 874 Connector, inner conductor "bendies" Hi Dennis, Yes, the inner conductor for the 125ohm version is considerably smaller than the normal version. I've always wondered if there was another use for them because some of the people selling them think they are made from pure gold (apparently). The box that's on ebay now has been there since at least 2008. When I was actively looking for them, they were easy to spot from far away at swap meets due to the gold. If there was a bin of 874s, I always did a quick scan of all of them because just as you occasionally run across a "normal" 874 that is gold plated, I have found 125 ohm versions that are not gold plated. (I have a "T" connector sitting on the couch next to me which has no gold at all, even though all three ends are 125 ohm). Also, the oldest 519 I have has no gold plated connectors at all. Seems odd to use gold plating as a visual key, but I guess if you're buying a 519, it's nice to have some bling instead of colored plastic. -Dave On Monday, August 12, 2019, 09:40:29 AM PDT, Dennis Tillman W7PF <dennis@...> wrote: Hi Dave, If I remember correctly the reason for the 125 ohm connectors was because that was the impedance of the vertical deflection plates. The input signal went directly to the plates. So I would guess the answer is no - there was no other use for 125 ohm connectors To get 125 ohm characteristic impedance the size of the inner conductor has to be different than for a 50 ohm characteristic impedance so Tek made special 50 ohm to 125 ohm adapters. The 50 ohm GR 874 connector was on one end and the 125 ohm GR connector was at the other end. The 50 ohm end was the standard color of all GR connectors. The 125 ohm end was plated with gold. Because of the gold they were quite eye catching and "unique". The entire set of adapters Tek made for the 519 came in a really beautiful mahogany box. I had one of those boxes with most of the 519 adapters. The box, the adapters, and the 519 are now in Barrie Gilbert's collection of scopes. Dennis Tillman W7PF -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Dave Seiter Sent: Monday, August 12, 2019 9:03 AM Speaking of the 874 connectors, were the 125 ohm versions ever used for anything unrelated to the 519s, or by anyone outside of Tek? -Dave On Sunday, August 11, 2019, 05:12:44 PM PDT, Dale H. Cook <bridgewaterma@...> wrote: On 8/11/2019 4:08 PM, Bruce Hunter wrote: The 774-series connectors were the predecessors of the 874-type and best described as a banana plug encased with an outer shield. They were not hermaphroditic. -- Dennis Tillman W7PF TekScopes Moderator -- Dennis Tillman W7PF TekScopes Moderator |
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Re: 5xx 'Scopes
On Mon, Aug 12, 2019 at 12:02 AM, @0culus wrote:
. . . . In the meantime, a curve tracer is the next piece of gear thatOne of the best finds of mine was a very nice Type 576 Curve Tracer (at a great price). The 576 has indeed helped me repair other equipment. More importantly, it has greatly increased my understanding of all these little pieces of black plastic with various wires protruding from the sides. -- Michael Lynch Dardanelle, AR |
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Re: 5xx 'Scopes
Phillip Potter
Sean,
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There is a place in Las Cruses, NM, called Edgar Digital Electronics... google it. Gotta run, Phil Phil, N6OMM On Aug 11, 2019, at 10:02 PM, [email protected] wrote: |
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Re: 547 Fan lubrication
I have used Mobil One 0W-15 for decades to lube small electric motors and always had great results. Sleeve bearings are made of sintered bronze and are porous, so care needs to be taken to be sure the old residue is flushed out and plenty new oil is absorbed.
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Bruce Gentry, KA2IVY On 8/13/19 6:43 AM, Morris Odell wrote:
Hi all, |
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Re: 547 Fan lubrication
On Tue, Aug 13, 2019 at 05:43 AM, Morris Odell wrote:
As you well know, the problem with these bearings is that the ideal lube is a light bodied grease that stays put. Simple to apply such grease when the motor is being assembled, unfortunately, it is impossible to get such a product into the bearings because of the close tolerances and other design characteristics. One must revert to a less viscous product that will penetrate the slim gaps, but still lubricate and stay in place. Definitely use a synthetic product that will not gum up. I use synthetic motor oil on many of these type applications. -- Michael Lynch Dardanelle, AR |
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Re: 547 Fan lubrication
tom jobe
Sewing machine oil...
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On 8/13/2019 3:43 AM, Morris Odell wrote:
Hi all, |
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Re: 547 Fan lubrication
What kind of bearings are they?
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I¡¯d consider using a Teflon-based lubricant. DaveD Sent from a small flat thingy On Aug 13, 2019, at 06:43, Morris Odell <vilgotch1@...> wrote: |
Mlynch001
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