¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io
Date
Re: Looking for Power Cord for 400-series Scope
Hmmm. I'm not sure if that would work with the existing panel and not sure how much effort it is to replace the entire back panel. Also, shipping would start to climb with the panel and we're
By n4buq · #149956 ·
Re: Looking for Power Cord for 400-series Scope
I actually have one that is at an angle but it is only a small plastic knob it that helps but all the rest are in the large rubber style boot. I can leave it in the panel if you like that way you
By v_12eng@... · #149955 ·
Re: Looking for Power Cord for 400-series Scope
That would probably work but I'd have to cut off the boot and I kind of hate to do that as those are hard to find. Perhaps I'll find one of the "plain" style cords. Thanks, Barry - N4BUQ
By n4buq · #149954 ·
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
By v_12eng@... · #149953 ·
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
By n4buq · #149952 ·
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
By John Miles · #149951 ·
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
By n4buq · #149950 ·
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
By Dave Seiter · #149949 ·
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
By Mark Kahrs · #149948 ·
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.
By Harvey White · #149947 ·
Re: ceramic capacitors
Yes, they are.? And, yes, they suck! Sent from my Verizon, Samsung Galaxy smartphone
By Jim Ford · #149946 ·
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]
By Dave Seiter · #149945 ·
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
By v_12eng@... · #149944 ·
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
By Rick Boswell, K8EZB · #149943 ·
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
By n4buq · #149942 ·
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:
By Chuck Harris <cfharris@...> · #149941 ·
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
By v_12eng@... · #149940 ·
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
By v_12eng@... · #149939 ·
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
By Vince · #149938 ·
Re: 2215A LVPS repair
By Bert Haskins · #149937 ·