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Re: Steve Jobs and Tektronix
What was Apple buying from Tek for less than $10 in 1976?
I've seen Tek scopes on eBay that had Apple property tags. The one that I almost bought was a T900 scope with missing VOLTS/DIV knobs. I should have save the pictures from the auction, but I didn't have the presence of mind at the time. -- Jeff Dutky |
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Steve Jobs and Tektronix
An interesting item is up for bid in the RR Auction (rrauction.com) ¡°Remarkable Rarities¡± auction. Besides an original Apple I computer, there is item: Lot 3036. It is a check from Apple Computer Company in 1976 (the year of the company¡¯s founding) made out to Tektronix, Inc. The check is signed by Steve Jobs and was drawn from the company¡¯s Wells Fargo account. The signature has been authenticated. The estimate is $25,000. The check amount is $9.18.
There is also some genuine moon rock dust used in an experiment, hand-written notes from Albert Einstein, and a lot of other autographs and some items from historical figures and events. If I had a bundle of money, I¡¯d bid the check to win it and donate it to Vintage Tek. Unfortunately, I¡¯ve not that sort of disposable income. |
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Re: OT need long range (>500 ft) wireless simple transceiver (or one-way acceptable) modules
Hi, Ed.? I couldn't get your personal email address, but maybe others in the group may benefit or add to this anyway.? ?I'd check L-com.? No experience with their products, but they seem to have this type of stuff.? Good luck.? ? ? ? ?Jim Ford?Sent from my T-Mobile 4G LTE Device
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-------- Original message --------From: "Ed Breya via groups.io" <edbreya@...> Date: 5/31/22 5:05 PM (GMT-08:00) To: [email protected] Subject: [TekScopes] OT need long range (>500 ft) wireless simple transceiver (or one-way acceptable) modules Up at the farm this weekend I discovered that the water pump had been running all the time for who knows how long, overflowing the storage tank and wasting electricity. Normally, the level is controlled by a Clay valve at the tank, which is a float actuated pilot valve that just shuts off the flow, and the pump control end senses the stall pressure and shuts it off. There is no electric power available at the tank, some 400-500 feet away from the house and water pump. I rebuilt the valve a few years ago, and at that time I started looking into remote communication, figuring to build a simple system with a small solar PV panel and SLA battery for power at the tank, a float switch, and some kind of ISM transceiver set to span the distance. I even found some good candidate TXRX modules online, but they now appear to be long obsolete and not available anymore. These were nice and simple, with just a few data lines that could be set at either end, and replicated at the opposite end. I revisited this a couple years ago, and couldn't find anything like what I wanted - only fancy ones like for internet protocol and such.Does anyone know of any good old fashioned simple signalling module sets (that are available) that would do the job? The simplest would be just half-duplex, even one bit OOK, to say for instance, "water too low, turn on pump." More bits and full duplex would offer more control options and status monitoring. I don't want any PC or uP stuff involved - just something that runs when turned on, and conveys the bits, for this very simple operation.For now, I've had to shut down the pump, and next time up here will look at fixing the valve again, so it's time to find something I can put together fairly quickly and get the electronic RC option going.Please reply off-list only.Ed
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Re: OT need long range (>500 ft) wireless simple transceiver (or one-way acceptable) modules
If you are OK for RS-232 serial protocol, there is this:
and these: One of them is a USB to RS-232 device making a connection to a system (or a Raspberry Pi, Arduino or other microcontroller simple (well, maybe simpler; there are RS-232 boards for the microcontrollers). Plenty of online support and open software for the microcontrollers as well. I have no CoI with any of these suppliers or manufacturers. A friend of mine used something like this to connect a remote terminal (not a computer - just a terminal) in an outbuilding to the computer in his house. It was basically like having a hard-wired connection between the two. Steve H. On Tue, May 31, 2022 at 20:05 Ed Breya via groups.io <edbreya= [email protected]> wrote: Up at the farm this weekend I discovered that the water pump had been |
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Re: Interpreting Transistor Curve Traces
EJP,
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I discovered that 100mV/div agreed with when using a timebase in a horizontal slot and presumed that was correct but I really need to READ THE MANUAL! :) Thanks, Barry - N4BUQ ----- Original Message -----
From: "EJP" <esmond.pitt@...> On Wed, Jun 1, 2022 at 01:10 AM, n4buq wrote:If the STEPYes. See manual p.1-8. beta = VERTICAL AMPS per DIV/STEP AMPL. |
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Re: Interpreting Transistor Curve Traces
On Wed, Jun 1, 2022 at 01:10 AM, n4buq wrote:
If the STEPYes. See manual p.1-8. beta = VERTICAL AMPS per DIV/STEP AMPL. Also, I'm curious as to how to properly set this up with the tracer in aNo. You are supposed to set the vertical amplifier to 100mV/div, and then control everything else on the 7CT1N. See manual p.1-1. I presume theCorrect, with the 100mV/div proviso above. EJP |
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Re: P6137 probe parts wanted
There is a seller on Yahoo Auctions here in Japan currently selling a new-in-pack spare cable (part number 174-1081-04) for 6500yen (about US$50) including local shipping.
I purchased one from them previously and my faulty probe is no longer faulty, so they are good parts. Message me off-board if you are interested in it. |
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Re: 3B3 Time Base Interesting Problem
Thank you Max, I will indeed revisit the 6BL8. I checked all the tubes and they seemed fine on my Philco 7052 (which is a re-badged Hickok 533A). However, it may have been marginal. Too, I have ran across too many tubes that look good on the tester, yet fail to work properly in some Tek circuits.
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All the tunnel diodes are in place (I looked to make sure they had not been made off with). However, They have not been checked. Will check the tube first, then address the condition of the TD's. Thanks again. On 5/31/22 07:42, unclebanjoman wrote:
Hi Jerome, |
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OT need long range (>500 ft) wireless simple transceiver (or one-way acceptable) modules
Up at the farm this weekend I discovered that the water pump had been running all the time for who knows how long, overflowing the storage tank and wasting electricity. Normally, the level is controlled by a Clay valve at the tank, which is a float actuated pilot valve that just shuts off the flow, and the pump control end senses the stall pressure and shuts it off. There is no electric power available at the tank, some 400-500 feet away from the house and water pump. I rebuilt the valve a few years ago, and at that time I started looking into remote communication, figuring to build a simple system with a small solar PV panel and SLA battery for power at the tank, a float switch, and some kind of ISM transceiver set to span the distance. I even found some good candidate TXRX modules online, but they now appear to be long obsolete and not available anymore. These were nice and simple, with just a few data lines that could be set at either end, and replicated at the opposite end. I revisited this a couple years ago, and couldn't find anything like what I wanted - only fancy ones like for internet protocol and such.
Does anyone know of any good old fashioned simple signalling module sets (that are available) that would do the job? The simplest would be just half-duplex, even one bit OOK, to say for instance, "water too low, turn on pump." More bits and full duplex would offer more control options and status monitoring. I don't want any PC or uP stuff involved - just something that runs when turned on, and conveys the bits, for this very simple operation. For now, I've had to shut down the pump, and next time up here will look at fixing the valve again, so it's time to find something I can put together fairly quickly and get the electronic RC option going. Please reply off-list only. Ed |
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Re: P6137 probe parts wanted
Thanks, and good points ¡ª I¡¯ll keep my eye out for better probes in original condition.
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David: |
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Re: HELP NEEDED with 465 #1
Stephen,
Getting the vertical board out to access the HV Multiplier is really not that bad. I have had several 465's apart in the past few months to replace the probe coding lamps. Take pictures of the coax connections and the other connections and you will be fine. You can do this without removing the Interface board, just loosen the various screws that secure the board and flex it up just enough to clear those two studs that protrude from the HV multiplier. You may also cut the HV lead off flush with the side of the multiplier case, so avoiding problems getting that HV conductor and connector out from under the CRT. Cutting it off will still allow ample material remaining to use on your newly constructed Multiplier. Some of the screws are a bit fiddly to get out and in, but nothing that you can't handle. Feel free to PM me with questions or comments. -- Michael Lynch Dardanelle, AR |
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Re: Interpreting Transistor Curve Traces
Yup
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-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of n4buq Sent: Tuesday, May 31, 2022 12:14 PM To: tekscopes <[email protected]> Subject: Re: [TekScopes] Interpreting Transistor Curve Traces Thanks, Ross. I'll check that out as well. Thanks, Barry - N4BUQ ----- Original Message ----- From: "si_emi_01" <wellington@...> Hi Barry, |
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Re: Interpreting Transistor Curve Traces
Thanks, Ross. I'll check that out as well.
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Thanks, Barry - N4BUQ ----- Original Message -----
From: "si_emi_01" <wellington@...> Hi Barry, |
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Re: Looking For White Socket Side Covers for 7000 Plugins
Jeff,
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I placed an extremely low offer but it expired without response. That might have been a product, though, of the holiday. In reality, I think I would have felt bad to get that merely to rob the covers. In the meantime, I have sourced a set of replacements from a list member (Tek Museum) and they're on their way so I'm good for now. BTW, Shapeways offers a new resin(?) that's supposed to be quite strong for thin applications like this. The problem is it would cost $30 each plus shipping - presumably because it's an SLA process. There's another material that uses conventional printing that I thought might also work but it looks like I don't have to worry about it for now. If I were to try this, I think I would beef the thicknesses just a bit. While not too much, there's room to do that for all three walls without causing an interference so this might still work. Thanks, Barry - N4BUQ ----- Original Message -----
From: "Jeff Dutky" <jeff.dutky@...> Barry, |
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Re: P6137 probe parts wanted
David:
I have used and collected TEK probes for decades My favorites are indeed P6137 and P6136, for 10X and Zo. 1/ With great patience its possible to locate mint perfect probes in original TEK case or pouch with all bits. Have paid $30..$75 worth it! 2/ Suggest to Use ONLY epay USA sellers and avoid Chinese and dealers. We got some from Ham Radio fleas and Silent Keys. 3/ For 2465/7/A/B and TEK 7000, these are the best probes. 4/ We have some active probes, FET, differential, and some HV but those are seldom used. The point is you need to keep searching and have patience to find a great item at a reasonable price... Bon Chance, Jon PS: See the excellent Tek Circuit Concepts book Oscilloscope Probe Circuits for all theory and practice. |
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Re: Interpreting Transistor Curve Traces
Hi Barry,
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Another good reference for using a Curve Tracer is: Tektronix Measurement Concepts Tektronix - Semiconductor Device Measurement - 1970 (062-1009-00) It's available on the TekWiki at: Ross -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of n4buq Sent: Tuesday, May 31, 2022 10:45 AM To: tekscopes <[email protected]> Subject: Re: [TekScopes] Interpreting Transistor Curve Traces I see where the manual covers this so I'll study on that before asking more questions. Thanks, Barry - N4BUQ ----- Original Message ----- From: "n4buq" <n4buq@...> Now that I've had some time to accustom myself with my 7CT1N, while I |
Jared Cabot
Michael W. Lynch
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