As it turns out, I have the Tektronix 2645A with serial number B010101. I picked it up at Surplus Gizmos for ~$150 and have probably spent that much more in caps, keeper battery and probes. Had

Hi all, There is some calibration data in the EEPROMs on the acquisition board, but also in the NVRAMs on the CPU board. I have been told that you should never swap acquisition boards between scopes

I have a design in pcb-rnd, which can maybe export to kicad, but pcb-rnd is a better FOSS ECAD tool for my style. No one has asked for the sources and one has asked for gerbers. Last time I bought a

First, you need to do research on which one the AudioPhools go bonkers over! Then search for the one they reject. I have actually seen technicians and customers try a dozen different brands and

Hi everyone, I debug by removing the top cover of my TM503 or the left, right, and top sides of my TM5003. That gives almost as good access as the pictured "naked" TM502. But my problem with an FG507

Hi Bob: Your excellent discovery that the TM502 power supply can be totally removed from the mainframe would haved save a lot of time years ago if I had only known about it. Many years ago I made a

That's a really good idea! Vince. -- K8ZW http://www.metalworkingfun.com http://www.hamradio.fun

Not having a board on hand I can not be sure of the LED dimensions, but the pinout is similar to the HDSP-7503 display from Broadcom. ed

You may be thinking of the board I made for the DC508 counter. It could be modified (new board) to fit the DC503A, but I would need an original board for the pattern as there are no dimensions in the

https://groups.io/g/TekScopes/album?id=239714 Photo of a "naked" TM502 as a service tool. -- Bob Haas

Steve, Here is the link to the discussion on using Java SW to copy your NVRAM data using the TDS784C internal floppy:

wrote: SPC stands for "Signal Path Compensation". This injects a calibration signal into the pre-amplifiers for each channel, and calibrates away any DC offset in the signal path

Steve, I don't know what you consider a low ball offer but I usually make brutally low offers on liquidator's equipment because usually it's so overpriced. I usually start at a max of 10%~20% of the

I've seen late TM503's (nomenclated TM503A) with a self-contained power supply but all the TM504's I've seen don't have a removable power supply assembly. A "naked" TM504, even a TM503 would be

can rotate it to get convenient access to the plug-in. It can be use with double-wide plug-ins such as the SC504. How about using a TM504? Does the cover come off those easily?

I had some (7000 series scope plug-ins) connectors made, but am out of stock right now. If you want to order 100, I have a source in Taiwan.

I find a convenient way of debugging TM500 modules is to use a bare TM502 power supply. It can be removed from the case. You can rotate it to get convenient access to the plug-in. It can be use with

Back in the olden days, if you saw: 5V4, you were talking of the metal envelope tube. 5V4G, you were talking of the coke bottle glass tube. 5V4GT, you were talking of the straight sided glass

Colin, Hatchet is sheathed. My point on my spelling of Guernsey, is the only internal spelling checker I have in me (an intentional redundant redundancy) spells phonetically. So, every time I type

Thank you for that clarification. I was puzzled by the fact that two adjacent 5V4G tubes were in different bottles. So if I'm reading your comment correctly, the straight-sided, smaller one is newer