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To Beeswax or not to Beeswax: that is the question.
Thank you for mentioning Faraday's “Experimental Researches in Electricity”. I hadn't known about it and have now ordered a copy. I visited the Faraday museum in London in 2001 and look forward to rea
Thank you for mentioning Faraday's “Experimental Researches in Electricity”. I hadn't known about it and have now ordered a copy. I visited the Faraday museum in London in 2001 and look forward to rea
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TomC
· #179924
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Help replacing a resistor/inductor in SG503
The ones that failed were rated at 15 volts and were on the 15 volt power lines. Obviously a poor choice as they only lasted 40 or so years before failing. Well, maybe not so bad after all. I think la
The ones that failed were rated at 15 volts and were on the 15 volt power lines. Obviously a poor choice as they only lasted 40 or so years before failing. Well, maybe not so bad after all. I think la
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TomC
· #179049
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Help replacing a resistor/inductor in SG503
Actually, what I failed to say was that I replaced those 4 tantalums, using a higher voltage rating, in every 7A26 I own. Both the ones that had failed short, and the ones that hadn't failed yet. But
Actually, what I failed to say was that I replaced those 4 tantalums, using a higher voltage rating, in every 7A26 I own. Both the ones that had failed short, and the ones that hadn't failed yet. But
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TomC
· #179017
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Help replacing a resistor/inductor in SG503
The 7A26 has 4 such LR components: LR1010, LR1014, LR1020, LR1024. They are 3.2uH wound on 10 ohm carbon comp. resistors. They are on the + and - 15 volt lines and are probably filtering noise going t
The 7A26 has 4 such LR components: LR1010, LR1014, LR1020, LR1024. They are 3.2uH wound on 10 ohm carbon comp. resistors. They are on the + and - 15 volt lines and are probably filtering noise going t
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TomC
· #179012
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Comments from Peter Keller on the 500 Series Scopes
Tim, that's a great photo. Especially striking with the blue phosphor and red graticule. Tom
Tim, that's a great photo. Especially striking with the blue phosphor and red graticule. Tom
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TomC
· #175319
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Asking for Help with Verifying Genuineness of 2465B from Ebay
This Tek FAQ is one such reference: https://www.tek.com/support/faqs/how-bandwidth-related-rise-time-oscilloscopes Also, with a lot more depth: https://download.tek.com/document/55W-18024-3.pdf
This Tek FAQ is one such reference: https://www.tek.com/support/faqs/how-bandwidth-related-rise-time-oscilloscopes Also, with a lot more depth: https://download.tek.com/document/55W-18024-3.pdf
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TomC
· #175261
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Asking for Help with Verifying Genuineness of 2465B from Ebay
Any of the above (whether 350 or 400) should be better than my 300 MHz 2465 that has a rise time measured at 0.91 nsec.
Any of the above (whether 350 or 400) should be better than my 300 MHz 2465 that has a rise time measured at 0.91 nsec.
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TomC
· #175208
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Asking for Help with Verifying Genuineness of 2465B from Ebay
Using Leo Bodnar's pulse generator, my 2465 (no A or B) measures 0.91 nsec. So there seems to be something not right with your 2465A. It should be better than my 2465. And your 2467 should certainly b
Using Leo Bodnar's pulse generator, my 2465 (no A or B) measures 0.91 nsec. So there seems to be something not right with your 2465A. It should be better than my 2465. And your 2467 should certainly b
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TomC
· #175197
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Scope Probe to BNC Adaptor
I use ones from Cal Test Electronics. So far, they have worked well for me. The two sizes are: CT2708 5 mm probe diameter CT3655 3.5 mm probe diameter They are available from, at least, DigiKey, Amazo
I use ones from Cal Test Electronics. So far, they have worked well for me. The two sizes are: CT2708 5 mm probe diameter CT3655 3.5 mm probe diameter They are available from, at least, DigiKey, Amazo
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TomC
· #166222
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2430A Smoke
I just checked. The wire is 36 gauge. Tom
I just checked. The wire is 36 gauge. Tom
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TomC
· #166164
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2430A Smoke
Hi Toby, No, I built replacements. Got some 10 ohm carbon comp resistors and a coil of small gauge wire. I counted 47 turns from a macro photo of an intact version. After winding it I applied a bit of
Hi Toby, No, I built replacements. Got some 10 ohm carbon comp resistors and a coil of small gauge wire. I counted 47 turns from a macro photo of an intact version. After winding it I applied a bit of
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TomC
· #166162
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2430A Smoke
Take a look at the interface connections for the A2 amplifier board. +15 comes on to the board and then through LR1024 (3.2 uH wound on 10 ohm carbon comp). After that is C1028, a 10 uf tantalum to gr
Take a look at the interface connections for the A2 amplifier board. +15 comes on to the board and then through LR1024 (3.2 uH wound on 10 ohm carbon comp). After that is C1028, a 10 uf tantalum to gr
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TomC
· #166160
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2430A Smoke
Hi Ernesto, In my cases, the tantalums all failed as a dead short, but still looked OK. However the dead short burned up the 10 ohm resistors that are used as coil forms for inductors. Tom
Hi Ernesto, In my cases, the tantalums all failed as a dead short, but still looked OK. However the dead short burned up the 10 ohm resistors that are used as coil forms for inductors. Tom
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TomC
· #166155
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Tek 2465 and 2465A
You might want to start with the 2465 as it doesn't have a battery backup for calibration data. The 2465A and 2465B do have the battery backup memory. If you haven't already, get the service manuals f
You might want to start with the 2465 as it doesn't have a battery backup for calibration data. The 2465A and 2465B do have the battery backup memory. If you haven't already, get the service manuals f
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TomC
· #166144
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2430A Smoke
My experience was tantalum failures in 7A26 plugins. When they fail short high current burns inductors consisting of 47 turns wound on 10 ohm carbon comp resistors. Those resistors can produce a heck
My experience was tantalum failures in 7A26 plugins. When they fail short high current burns inductors consisting of 47 turns wound on 10 ohm carbon comp resistors. Those resistors can produce a heck
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TomC
· #166110
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Tektronix 7904, no horizontal trace on input B
Now that the B intensity pot is moving freely, put a meter on it to verify that it is electrically OK too. Tom
Now that the B intensity pot is moving freely, put a meter on it to verify that it is electrically OK too. Tom
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TomC
· #161809
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2445 CH 3 and CH 4 vertical setting - volts/ div where ?
The channel 3 and 4 volts/div for the 2445 can be anything you want as long as you want 0.5 volts/div or 0.1 volts/div. It is selected by a pair of push buttons, one for each channel, between the chan
The channel 3 and 4 volts/div for the 2445 can be anything you want as long as you want 0.5 volts/div or 0.1 volts/div. It is selected by a pair of push buttons, one for each channel, between the chan
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TomC
· #161539
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P6042 -- bad line cord
Dennis, I got the same garbled email as you got. A search for "Tektronix P6042 current probe is a classic" got the EDN article as the first hit. Tom
Dennis, I got the same garbled email as you got. A search for "Tektronix P6042 current probe is a classic" got the EDN article as the first hit. Tom
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TomC
· #160397
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100 Tek Photos
That's a Nagra IV-SJ stereo tape recorder. It was an instrumentation data recorder, although it works for audio too. From Wikipedia: On 9/11/2019 8:01 PM, John Griessen wrote:
That's a Nagra IV-SJ stereo tape recorder. It was an instrumentation data recorder, although it works for audio too. From Wikipedia: On 9/11/2019 8:01 PM, John Griessen wrote:
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TomC
· #159985
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Photo Storage Space Solution, was IMPORTANT: Photos are eating up our storage
I'm pretty sure that the Arc files were transferred to the groups.io photo library. Tom
I'm pretty sure that the Arc files were transferred to the groups.io photo library. Tom
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TomC
· #157238
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