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Guy, Thanks for your insights Where I have been focused the last day is to try and understand why the CLKOUT stays at 25mhz both in the hung and running fine state. Actually its probably 24mhz due

Ke-Fong Lin, Thank you so much for your offer! I mean if it wouldn't be too much trouble for you, that would be incredible! I'd be happy with just one cable extender. Also would be willing to pay

Hi, I want to know the connections of the AC mains range selector switch of the 7904. This isn't the A model. I know the AC mains range selector switch is similar to the Tek 465. I don't have the

It's low likely because of a ton of ripple. More load ---》 more ripple.

Don, You have bad condensers. That is the most likely problem. Being from '78, that is enough years to warrant replacing them. I have a B version I put new condensers in as well as increasing the

I have some spare PCBs that you can have for cost of shipping.

Nice scope, that option is what I'd hoped for, but didn't get, when I found my 465B. Not useful anymore, with digital TV. The rest of the scope is a great classic Tek portable. First thing I'd

That's very kind of you to offer Eric! I greatly appreciate it. I think I'll shoot an email over to Dan to see if any of those kits are available. I'll keep looking before asking to

Always good to check the voltages rails first which I see you did. But I would still be interested in figuring out why that 5V rail is so out of spec (should be 5 +-0.075V). Also, I would check the

An acquaintance near here says he has some Tektronix gear that used to belong to his deceased father, who formerly worked for Burroughs. He sent me some photos of what he could get to easily, but that

First Post! Not seeing much by the way of editing tools for posts so I'll do my best. Test equipment: Hantek DSO2C15 oscilloscope Tektronix 2465A oscilloscope Fluke 87 V

I took a shoot in the dark an bought a non working 576 from a local classified section (something fell on top of it and cracked the aluminum bezel and sheered of a couple of the knobs on

I am glad to read that Dennis is doing well. I hope he has a great and speedy recovery. It would have been nice if there'd been a Tektronix 576 in the operating room. Dennis could've given them

From John with permission, personal friend of Dennis... Just got a call from Dennis. He sounds very good. On Saturday, Feb 10, they put in only one stent, the second being unnecessary. The one

It was amusing that the movie shows NASA engineers checking /sums of numbers /with their slide rules. The old-timers in the theater groaned quietly but audibly. -- Prof. Thomas H. Lee Allen Ctr.,

The probe compensation signal (referred to as the calibrator in the service manual) is different than most other scopes as Jon notes. It will produce a 5 cycle square wave on any sweep rate set

Jim, There actually were slide rules designed for particular specialties and occupations. A company called Hemmi (Japanese, and still around) made all manner of specialist slide rules. I believe they

I don't know if he's on this group or not, but I don't think he'd mind. If that doesn't work out, I have 2 that you could probably borrow for postage. Eric

Thanks a lot for the tip Eric! Is he in this group? Sorry I'm relatively new to this group and I know it has a ton of members. Do you think he would mind me emailing him? I've been looking for

I got a set of TM500/5000 cable-based extenders from Dan Meeks ( dan.meeks222@...) as a kit not sure if he has any left, but it might be worth contacting him. Eric