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It turns out that a friend has a Sencore CR70 CRT checker, but it doesn't seem to cover many scope tubes. Does anyone know if there's a way to use it to check the 547 crt? Thanks Gordon

Depends on what you mean by “broke”, Luca. If you mean uh, yeah, it seems like it’s working, then it could mean it’s not broke. But it would be foolish to assume that something inside one of

Hi Larry, The battery I used was a LTC-7PN 3.5v 750mAH from eBay. I paid $25 with free shipping (US). Unfortunately the vendor is out of stock and there are many of this battery listed on eBay for

Firstly, I want to say thanks to Steve for his good words, and clarify that his "Thank You" was unsolicited. In this day and age, the simple words "Thank You" are generally considered surplus and

Hi all, I noticed my 7A13 amplitude was way down on a 70 MHz sine the other day, so figured I'd run through the calibration. I skipped the input resistance section that requires the precision DC

Jay, The resistors that are known to give problems are to Q1851, Q1852 and Q1890. Mouser part number for these are: 279-H4P150KFCA, 279-H4P180KFZA, 71-CCF60-332K-E3, 279-H4P430KFZA and (2 in series)

From the Tektronix Documentation Eagle Picher LTC-7P Battery Non-Rechargeable,Rectangular, Lithium Thionyl Chloride,3.5 VDC,750mAh MFR Part #: LTC-7P RS Stock Number: 70141129 That's RS components

Thanks. The CRT's brightness is fine. It's the focus that is soft and is most noticeable in the corners. I'll have a look at the schematic and get my bearings on where the focus resistors are and

Luca, You nailed it! Some things you know to redo because of age/known problems no matter if it works today or not. What works today can easily fail tomorrow. What you save today could cost more

Jay, You know by now to recap the piece as PM. This way, you know it is up to date and better quality condensers are installed. There are some resistors that should be increased in wattage..

Problem solved. HV Module U130 has defect and have to be replaced. New one is unobtainable. U130 made by me. I chose diodes 2CL77 20kV 5 mA 100Khz and 470 pF 6kV for the multiplier. The remaining

The "if it ain't broke, don't fix it" attitude kind of doesn't fly with these scopes anymore. I've opened three of these 24xx series scopes and each of them had their selection of either cracked

Thanks Tom and Darla for helping Susan and the family to keep the inventory of electronics available. I was a customer of Sphere Research for both slide rules and electronics for years. Whenever I

I picked up a working 2465B locally for a decent price, at least much more decent than eBay prices. It has a lot of miles on it and has certainly been used (40k+ hours) but obviously not abused.

Thank you, Tom and Darla, for taking on this monumental task!? Best wishes as you continue the Shawlee legacy. Jim FordLaguna Hills, California, USA

As many may remember, Walter Shawlee II passed away September of 2023. Since that time, his wife Susan, and children, have been busying themselves with the task of liquidating much of the electronic

I am looking for someone to measure the height from the bottom of the knob to the center of the set screw hole. some dimensions on the qservice page. but not listed set screw height. same knob used in

Could you elaborate? URL or better description. Thanks, larry

I have a 2465BDV and have looked at re-capping it from time to time. So far, my "if it ain't broke, don't fix it" attitude has prevailed and, since the 'scope has worked beautifully since I had it

Hi: I just want to say I am moderating this post. It reads like, a promotion, for a product or service. AFAIR, TekScopes hasn't allowed promotions for products or services... with the exception of