Most of my Tek equipment was built in Guernsey, and it all has serial numbers starting with 1. My 535A is right in front of me, serial number 101936, and my 7904A (built in Guernsey even though I boug

david.partridge@...> wrote: When I've had readout problems like this it's often been due to dirty contacts on the edge connector. Since the readout is an analogue system, and is sufficiently

The 7B85 delaying timebase can certainly do this in a 4-bay 7K mainframe, and according to Tekwiki they date from 1976 which somewhat predates the 24xx series. Chris

Thanks to everyone for the input and for the practical experiments. I use the 7A13 frequently for working with multi-cell battery systems, for which it's an absolute delight, and the 1A5 has very simi

Thanks for your thoughts. I tried my other plugins tonight with my standard test: view a 0.5V pk-pk squarewave at 0.1V/cm, then increase the amplitude to 10V pk-pk and watch for any change in the base

I've just become the proud owner of a 1A5 differential comparator plugin for my 535A scope. It's a wonderful thing and its only real fault was that the variable volts/cm pot was made of that awful cru

That's what I'm beginning to think. My particular A6302 is a newer version, I think: the connector to the hall/transformer/core is different to the one in the manual, and instead of a fixed resistor t

I've tried manually degaussing the probe with the wand I normally use for tape head degaussing, and it doesn't seem to have had any noticeable effect on the offset. One thing I do observe is that the

Yes, the delay lines are built in to the 11802's acquisition module. They're very substantial, heavy pieces of plumbing. Each of them has a power splitter on the input which sends part of the signal d

I've certainly used the degauss function on the AM503s lots of times, and it's definitely working (the probe makes the characteristic 'boing' noise). However, perhaps the core or metalwork is more mag

I have here an A6302 current probe which has a DC offset too big to be corrected by the AM503's balance control. I've had it apart and it doesn't seem to be damaged, and indeed appears to work fine ap

Soon after I bought my CSA803A I picked up a scrap 11802 (missing its power supply) off eBay in order to get the delay lines. The delay lines aren't useful for TDR, as far as I know, but they make the

If it helps, my office/lab/collection of Tek equipment is in Warsaw, Poland, and very close to a post office. Chris

I have a Type G differential amplifier plugin for the 500-series scopes available for sale. I bought it a whole ago and fixed it up but have now got another plugin which better suits my needs, so this

Tek fans, I've just switched on for the first time a 7104 that I picked up in a disposal auction recently. It came with the correct plugins (7A29, 7A29 with variable delay, 7B15 and 7B10) and the main

I have a 7B90P which lives in my 7912AD. As Brian has said, these plugins run their logic (including the microprocessor) from the +5V lighting supply, so they don't work at all if that supply is missi

wrote: If the 7L13 is anything like the 7L12, the resolution bandwidth filters contain the unreliable Tek relays. My 7L12 showed no results on some bandwidth settings until I took the relays out and e

Yes, this is certainly possible on the 4-slot scopes. I do it on my 7904A. Two timebases in the vertical slots. Horizontal mode set to ALT, vertical to CHOP I think (though it could be the other way r

<pulaskite@...> wrote: If your 11801 is anything like my CSA803A, the internal clock output disappears when I select external triggering. I've just tried it. Chris

I've done exactly this to my 2430A. I've replaced both of the dead Dallas NVRAM chips with Cirrus FM18W08 FRAMs in off-the-shelf SOIC to DIP converters (Aries LCQT-SOIC28), all bought from Farnell in