Re: Looking for Power Cord for 400-series Scope
I have some but they are the ones that come out in the 90 degree rubber boot. Jim
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v_12eng@...
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#149953
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Looking for Power Cord for 400-series Scope
Anyone know where a replacement power cord can be obtained that matches the original for a 400-series scope (for U.S. power outlets)? Someone cut the ground pin off of my 465B and I'd like to replace
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n4buq
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#149952
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Re: Tek 495P A54 Memory Board Repair
Sorry on behalf of the group for the "helpless" comment. That was uncalled-for when you don't know who's at the other end of the conversation, or what their abilities/handicaps might be. That being
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John Miles
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#149951
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Re: Replacing Electrolytics in a 465/465B
Hi Jim, Thanks for the kind remarks. Unfortunately, I don't think there's any room for another snap-in cap on that board. Here's the list I used. I'm pasting this in with tabs but I have a feeling
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n4buq
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#149950
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Type 190A tuning donut
I was moving things around today, and happened to turn the tuning knob on my 190A, and the frequency display didn't rotate.? Turns out the rubber donut was cracked/broken in five places (but still
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Dave Seiter
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#149949
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Re: Homemade tunnel diodes
I hate to disagree with Jose, but there have been a fair number of papers on constructing NLTLs --- some even using discrete diodes. If you'd like to read a review of the patents, may I refer you to
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Mark Kahrs
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#149948
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Re: ceramic capacitors
I haven't seen a problem where I can pin it down to one of them failing. I'm probably not as critical as others might be, though. Harvey I tend to use x5R and X7R for new designs, though.
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Harvey White
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#149947
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Re: ceramic capacitors
Yes, they are.? And, yes, they suck! Sent from my Verizon, Samsung Galaxy smartphone
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Jim Ford
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#149946
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Re: ceramic capacitors
I don't think that Z5U types are still being manufactured; I know surface mount types were phased out years ago.? Maybe really cheap disk types are still being made.?? -Dave To: [email protected]
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Dave Seiter
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#149945
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Re: Replacing Electrolytics in a 465/465B
Really neat practical fix very tidy I am doing a 466 which uses six caps so how would that board work there would have to mount one closest to the transformer to the main board? What are you asking
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v_12eng@...
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#149944
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Re: Tek 495P A54 Memory Board Repair
Now sorry I posted here after the responses received so far. I didn't ask for advice on how to repair the board, or comments on my helplessness, but rather, a pointer to someone (knowledgeable) who
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Rick Boswell, K8EZB
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#149943
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Replacing Electrolytics in a 465/465B
Recently, I had a problem with the LV supplies in my 465B. Thinking it was a shorted electrolytic can, I decided to replace all of them (although it turned out to be a shorted tantalum but had already
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n4buq
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#149942
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Re: ceramic capacitors
And yet the scope is stable enough already. There is an old saying: "If it ain't broke, don't fix it." -Chuck Harris Jim Olson wrote:
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Chuck Harris <cfharris@...>
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#149941
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Re: ceramic capacitors
Forgot to add that the higher class 2 have much less change to capacitance +-15% vs +20%-85% so should make the scope more stable. Jim
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v_12eng@...
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#149940
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ceramic capacitors
Here is a pondering question for you all to think on. How many of you have considered replacing (upgrade) the ceramic disc caps to a higher class 2 grade like X5R or X7R to replace all the Z5U ones
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v_12eng@...
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#149939
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Re: 2215A LVPS repair
Yes forgot to tell him to check for that too... but in my defense it was implied in my generic "meets or exceeds specs" general statement ^^ Of course in case of gate capacitance, "exceeds" means
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Vince
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#149938
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Re: 2215A LVPS repair
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Bert Haskins
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#149937
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Re: Tek 495P A54 Memory Board Repair
Unless it's an expensive IC, troubleshooting a circuit like that is difficult since it is only read once while the SA is booting up. That's why most people would just change a gumdrop IC to attempt
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Michael A. Terrell
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#149936
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Re: Tek 495P A54 Memory Board Repair
To be fair, some of the members are just getting into electronics. I've been at it for over 50 years. At one point I spent eight hours a day testing new circuit boards and repairing the bad ones. My
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Michael A. Terrell
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#149935
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Re: 2215A LVPS repair
Hi Vincent, this is funny, after my previous post I went looking for a Faster, Lower On-resistance, Higher Voltage FET, and found this one: IPA60R280E6 , so this is in the same area as the one you
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satbeginner
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#149934
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