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James: "What is the dog house hole? Is it the slot in the middle of the PSU panel where the HV lead The HV section has a metal cover (doghouse) with a 3/8" hole where HV U;tpr 21 kV connector

Hello Wofgang, Thanks for the initiative. I would also be interested in two sets of boards. I have 2 7A13's that I would like to repair. with best regards, Patrick Vandenberghe (Belgium)

Hi Barry, sorry for the confusion regarding the 148-0063-00. I didn't know the part number and just googled the part. From the pictures I found I thought it was just as simple DPDT relay (like

When I started working on mine, I found that bits of the meter scale were flaking off; so, I made an accurate photo of it. (I have a fairly good digital macrophotography setup). If the scale gets bad

Would love to have one but it would make all my other Tek stuff look bad even though I've put a lot of effort into spiffing all of them up! Tracy

Wow - I had spotted my scale is non-linear but had not appreciated that they were individual to the meter. When you say 'meter' do you mean one scale for that particular range of meters as used in

Thanks for that and filed away. Here's a link to one I did 30 years ago in Freehand on Mac a running OS 9.2.2, Did the arithmetic and just drew it, in about half a

There are several software programs for generating meter faces, paid or free. Two are: https://meterbuilder.com/mb1/custom-meter-scales.html

I have to redraw the scale for mine, it's faded beyond readability. If those scales weren't individual to the meter the redrawn scale might be of some use to others. Not happening anytime soon

Tektronix 106 Square Wave Generators for sale on eBay new surplus in Box. Preferred Air Parts have three of these left out of five. I just purchased one. If you don’t have one you need one! I will

Richard, many thanks glad I could help. Ed, fine mod, I will do the same on my 130 LC. By the way are the meter scales hand calibrated? Plan à similaire mod for à Tek 191 constant amplitude

One of my 7904s just crapped out with HV arcing inside the PS unit - very loud and obvious. I had just fixed it (it had other problems not HV) back in November, and I'm convinced the failure was due

I agree - no line filter is needed. I'd say also that no extra trim plate is needed either unless the metalwork has been messed up. I changed my 130s to IEC recently by filing out the hole periphery

James, The neon, DB1219, should stay lit for a bit of time after turning the unit off. By going off fast, that sure sounds like your main filters are bad. In these in my 7000 series, I used Nichicon

Hi Gerard, Does the CSA803A have a color display or is it BW? Could you give a refdes for the parts in question or link to a photo somewhere so I can find their location? PS: I would suggest the

The neon functioning is acting normal for operation of the PSU. The service manual calls it out as a "safe handling" indicator IE don’t handle the supply while it is still flashing. The supply has

Hi all and thanks for the replies and help. I'm pretty sure it's in the PSU but I will reconnect it all (again), fire it up, and try the trick with the microphone in a plastic tube. Trouble is, I'm

Hi Wolfgang, Regarding the 148-0063-00, I don't know what type of relay you're thinking of using but that relay is designed to operate such that when the polarity is one way, one set of contacts are

Clew...scope, bought in filthy condition.... Crackling... Almost certainly the HV ultor 21 KV at X7 multi On our 7904A, exactly same problem. Doubtful if LV PS or bus caps. We have experience in

Take a long plastic tube, at least 1 foot.? You could use cardboard, but plumbing material is fine.? Stuff a microphone down one end and seal it in with tape.? Run the microphone to an amplifier.?