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

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

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

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

Tim, that's a great photo. Especially striking with the blue phosphor and red graticule. Tom

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

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.

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

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 just checked. The wire is 36 gauge. Tom

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

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

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

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

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

Now that the B intensity pot is moving freely, put a meter on it to verify that it is electrically OK too. Tom

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

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

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:

I'm pretty sure that the Arc files were transferred to the groups.io photo library. Tom