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Emerson-Cumming used to sell a very good epoxy dissolving liquid. Wear super strong gloves and an N95 mask on your face, or the liquid will dissolve the skin on your fingers and wreak havoc on your

A frame and front panel from a 5000 series scope plugin is the same as the TM500[0] plugins. Sometimes they can be found for under $20 on ebay. Vince. -- K8ZW http://www.metalworkingfun.com

The balast resistor should be located as close to the tube anode as possible (minimum stray capacitance to the tube anode). Leon Robinson ?K5JLR

Bonjour a tous, Working on my 7L5, has just one bad shaft encoder knob, the FREQ span/div Usual flaky positions 1/2/5 kHz are acting like 100/200/500 kHz. Just using contact cleaner does not fix the

Rodger: Mille mercis: 1/ Swapping into another 7904 MF, the issues are in the 7603. Opened up, Voila, dirty board edge connectors on the backplane, folded biz card soaked in contact renew, cleaned all

I talked to a friend of mine that used to do Failure Analysis for Litton Laser. He has some PSUs made by Laser Drive, Inc. and he's going to look and see if he can find something with a similar part

Jean-Paul, You may also need to clean the switch segments in the plugins that are responsible for changing the readout characters - you will find some of the cam switch segments just switch different

I have just had an idea for aligning holes in cases where access to some internal item might be required (and I wish I'd thought about it some time ago). It occurred to me that lots of simple little

Walter, I'm not familiar with this instrument; so, I may be way off base --but - Rather than drilling a hole in the case, why not the following? 1) Adjust as normal 2) Close the case 3) Measure, as

Hi Walter, if you make that adjustment hole and it aligns successfully, could you please post the information so as to be able to duplicate it? I still need to make that same adjustment on my 2247A

Monty: How can I purchase the EZ-Test tapes and others you mention? Gary -- Gary Robert Bosworth grbosworth@gma

I should add Roger that I am not convinced that U2102 is the problem...but it might be. After reading the theory of operation, which I only partially understand, it could be many different things. If

Bonjour a tous, Voeux Nouvelle Année! The 7603 is used with 7L5 or 7L12 SA plugins. All OK except both SA have a flaky RO, with several areas showing scrambled alphanumerics. If I push on the FP of

Hi Bert. Cables not the issue in this case as the problem follows the input on the storage board not the cables connected to them. I'm continuing to investigate but this scope is not the easiest to

Thanks for that Roger. My 2230 used the later U2101 234-0408-20 chip which absolutely does not seem to exist anywhere but I believe I could get the earlier more common one you mention to work. My

Hi Attilio, It's in a TO-5 transistor package, so a bit non-standard. It's not soldered in place -- it plugs into a 3-pin socket (the nice ones Tek used in later products -- the ones with the silicone

Reading through Wikipedia, MEK is also a *welding* agent for plastic parts, used in scale modelling. I remember having put together many scale buildings for my fathers model railroad. The "glue" I was

Hi Tom, so it is a standard AT cut crystal, a third overtone crystal, with an accuracy of 5 ppm. But what kind of container is the crystal in ? Thanks -- Cheers Attilio

Maybe I should draw up some 3D files for 3D printable chassis parts. :D

Hi Jim, I did find the data in the Common Design Parts catalog (thanks again!), but I didn't see anything about the crystal being an SC-cut. The reason I'm so interested in this detail is that an