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Re: Cheap differential probe ?
Bob Albert
Try ebay.
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Bob On Thursday, March 1, 2018, 6:11:02 PM PST, David Slipper <softfoot@...> wrote:
Can anyone suggest a source of the above ?? DC to 20MHz would be more than adequate. I don't even need a high voltage device - 30V would be OK, 100V would be better. I'd even consider a DIY or kit implementation. Any suggestions? TIA Dave |
Re: Looking for AWG2000 sample waveform disk
I'm looking for that disc for a AWG 2040.
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Michael Lynch From My I-Phone mlynch002@... 479-477-1115 On Mar 1, 2018, at 3:58 PM, John Shadbolt <john_shadbolt@...> wrote: |
Re: Back feet for 335 scope
A while back I found a guy named Bob Haas, who was selling molded 400 series feet on eBay, try and make up some 314 feet (same as the 335.) I sent him a couple of feet and he made a couple of sets for me but he said they were too hard to make and weren't of the quality he could sell. I'd be interested in how this goes and might be interested in a set myself.
Thanks, John Clark ________________________________ From: [email protected] <[email protected]> on behalf of Phillip Potter <p.potter@...> Sent: Thursday, March 1, 2018 4:56 PM To: [email protected] Subject: Re: [TekScopes] Back feet for 335 scope Hi Jeff, Are you N0dy? If so, I just emailed you about your 400 series feet. If your process is nondestructive, maybe we can get Lee H. (on list) to volunteer his one surviving complete foot for measurement... I have a picture of the foot, upon which I have drawn (crudely) the measurements, that I will put that in my folder on the server: /g/TekScopes/photo/33014/2?p=Name,,,20,1,0,0 If it comes to pass that Lee would allow you to measure and print out feet... he should probably be the one to receive your kind offer of printed feet, not me, but I would buy a set from you. Phil On 3/1/2018 1:36 PM, Jeff Davis wrote: Hi all, |
Re: Back feet for 335 scope
Jeff, the foot is packaged up in a USPS Small Flat Rate box. Hopefully I will remember to mail it tomorrow and you will likely have it Monday. You should have received an email from the USPS with the tracking number; if not yet then you should when they have the package. Just remember to save my shipping label for the return address.
Now to find a source for 2445 and 2430A feet.... |
Re: SG505 Output voltage too high
Hi Rick,
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This would be a much cheaper, do it yourself, alternative that would take you a few minutes to make. Buy this resistor and put it on a dual banana plug: Through Hole, 1W, 600ohms, 1%, $0.25 each, Mouser #71-CMF60600R00FKR6 Dennis Tillman W7PF -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of esmondpitt Sent: Thursday, March 01, 2018 2:37 PM To: [email protected] Subject: Re: [TekScopes] SG505 Output voltage too high The simple answer to this is that unless the output is terminated with 600 ohms it will be +6dB too high. Get yourself a BNC Y attachment and a 600 ohm attenuator from BroadWave Technologies, and be calibrated forever afterward! EJP -- Dennis Tillman W7PF TekScopes Moderator |
Re: TekWiki Helper Idea. Brainstorm or Washout?
Siggi,
At the bottom of H?kan's page that I linked in: "NOTE: Since my Microfiche copier recently broke down I will not be able to provide any scans, at least not for some time. This message will be removed if and when I either have it repaired or acquired another on. Updated Feb 27 2018" His webpage says that he does have additional information that he hasn't scanned and uploaded, but it looks like that process is on hold until further notice since it's all on microfishe. In the meantime, I'll keep searching for more databases of documentation in hopes of finding something that lists the options for various pieces of equipment. I know that's precisely what we're looking to accomplish on TekWiki, but my guess is that someone's already done exactly that or at least started to. Otherwise, it's on to catalog surfing and seeking out "with options" service manuals to reference, which is going to be extremely time consuming. Brian |
Re: TekWiki Helper Idea. Brainstorm or Washout?
Hey Brian,
H?kan is a member here - at least he was before the relocation to groups.io. He's frequently helped out other Tek enthusiasts with this and that, sometimes by consulting his microfiche stash. Maybe he has summaries of instrument options in his stash. We might ask, I guess. Siggi On Thu, 1 Mar 2018 at 17:44 Brian Bloom via Groups.Io <analogaddict013= [email protected]> wrote: Found a large list of Tek MODS and their relative documentation: |
Re: Tek 2465a grid bias and brightness problems
On Thu, 1 Mar 2018 at 17:21 Francesco <madowax@...> wrote:
Thanks Siggi, I have just tested every resistor you listed out of circuit,well, now that you know the resistor values for sure, the next step would be to measure the voltage drop over them in-circuit. I'd suggest leaving the scope running for 10-15 minutes before you do so, as it's easier to get consistent measurements that way. Alternatively you could short the slow-start capacitor to get a consistent measurement in the stone-cold state. If you measure and report the voltage drops over R1994, R1881 and R1992, we can do a bit of math and see whether the currents make sensible values. Is it reasonable for you to do this with the grid bias pot at min and max settings? Note that resistors can go wonky in weird ways. In my 485, I found a resistor that measured in spec on my DMM, but had voltage-dependent resistance in circuit. A bit of a head-scratcher that one :). Siggi |
Re: Back feet for 335 scope
Phillip Potter
Lee...
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Thank you for your willingness to help out a fellow Tek 335 owner in need!!? :) Thank you, Jeff, for offering your service, as well... If I can help with postage or ?, please email me off list and I will be especially happy to assist in any way I can. Phil On 3/1/2018 2:26 PM, Lee Houde wrote:
Phillip Potter, Jeff Davis N0DY - |
Re: Back feet for 335 scope
Jeff Davis
Hi Lee,
Thanks! I'll get to work on it as soon as the foot arrives! My address: Jeff Davis 12 Galora Lane Ladera Ranch, CA 92694 319-431-3846 (cell) Regards, Jeff ________________________________ From: [email protected] <[email protected]> on behalf of Lee Houde <houdatto@...> Sent: Thursday, March 1, 2018 2:26 PM To: [email protected] Subject: Re: [TekScopes] Back feet for 335 scope Phillip Potter, Jeff Davis N0DY - It would appear you two are on the same page so I would be more that willing to send my one good 335 foot to Jeff for modeling and creation of new feet. Jeff if you will pm me your address off group I will get the foot out in the mail ASAP. Lee NV8YH |
Re: Back feet for 335 scope
Phillip Potter, Jeff Davis N0DY -
It would appear you two are on the same page so I would be more that willing to send my one good 335 foot to Jeff for modeling and creation of new feet. Jeff if you will pm me your address off group I will get the foot out in the mail ASAP. Lee NV8YH |
Re: Tek 2465a grid bias and brightness problems
Thanks Siggi, I have just tested every resistor you listed out of circuit, they all test good and they are still in spec even the 1% tolerance ones, I replaced R1878 when I received the scope, the previous owner butchered it, probably the grid bias problem was there when he sold the scope, I also replaced c1991, just to be sure it wasn't leaking. The only thing I found a bit strange is the waveform from pin 7 of high voltage trasformer, the sinewave seems a bit asymmetrical, however -300v test point is exactly at -300V. Thanks again.
Regards Francesco. |
Re: Back feet for 335 scope
Jeff Davis
Hi Phil,
Yep, that's me. And I did get your email and have sent a response. What I do is entirely non-destructive. I just need to take measurements from the existing foot Jeff ________________________________ From: [email protected] <[email protected]> on behalf of Phillip Potter <p.potter@...> Sent: Thursday, March 1, 2018 1:56 PM To: [email protected] Subject: Re: [TekScopes] Back feet for 335 scope Hi Jeff, Are you N0dy? If so, I just emailed you about your 400 series feet. If your process is nondestructive, maybe we can get Lee H. (on list) to volunteer his one surviving complete foot for measurement... I have a picture of the foot, upon which I have drawn (crudely) the measurements, that I will put that in my folder on the server: If it comes to pass that Lee would allow you to measure and print out feet... he should probably be the one to receive your kind offer of printed feet, not me, but I would buy a set from you. Phil On 3/1/2018 1:36 PM, Jeff Davis wrote: Hi all, |
Re: Back feet for 335 scope
Phillip Potter
Hi Jeff,
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Are you N0dy?? If so, I just emailed you about your 400 series feet. If your process is nondestructive, maybe we can get Lee H. (on list) to volunteer his one surviving complete foot for measurement... I have a picture of the foot, upon which I have drawn (crudely) the measurements, that I will put that in my folder on the server: /g/TekScopes/photo/33014/2?p=Name,,,20,1,0,0 If it comes to pass that Lee would allow you to measure and print out feet... he should probably be the one to receive your kind offer of printed feet, not me, but I would buy a set from you. Phil On 3/1/2018 1:36 PM, Jeff Davis wrote:
Hi all, |
Re: Back feet for 335 scope
Jeff Davis
Hi all,
I'd be willing to undertake the 3D modelling and printing with a durable nylon material if I could get my hands on a reasonable existing foot to take measurements from. I've already developed models of 465/475 and 453/454 feet that are near identical replacements for the existing feet. In exchange for the use of your foot, I'd be happy to provide a set of nylon printed feet gratis to upgrade your existing feet. I would then make these feet available to the community through the same channels I use for my 465/475 and 453/454 feet. PM me if interested. Thanks, Jeff ________________________________ From: [email protected] <[email protected]> on behalf of Phillip Potter <p.potter@...> Sent: Thursday, March 1, 2018 12:34 PM To: [email protected] Subject: [TekScopes] Back feet for 335 scope Hello all, The feet on the rear of my 335 are crumbling apart, literally! I talked to Walter at Sphere and he has nothing even close, and searches on the net reveal nothing... so, I am coming to the group to see if there might happen to be someone who has any extra rear feet (Tek PN 348-0425-00) or even just one, that could be spared (or loaned?) to me as an example of a complete foot? I don't know if they could be 3-D printed or cast, but I don't have even one that is complete... mine are all crumbled. Here is a picture of what it looks like (borrowed from the internet): Thanks for any suggestion or help you can provide. Phil |
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