I don't know the full answer, but the nearest I can think of quickly is that some (or all?) of the 7000-series timebase plugins limit the beam current at slow sweep speeds to prevent CRT burn. That's

I mentioned the P6042 and A6302 in a recent message but is seems to have been lost somewhere. Both probes are long out of production. The P6042 has an interesting design and is complete i. e. does not

Yes it is unfortunate that someone took all the tubes , from what i had a was able to find some tubds , howerer not all i have a good number 6dj8 and a few other , but just not enough to complete the

[Sorry for the previous message, got sent inadvertently while I was in the middle of writing it ! :-/ Discard it] Hi group, Sometimes I wonder about this... maybe the experts on here have some

Hi group, Sometimes I wonder about this... maybe the experts on here have some view on this ?? I mean, the brightness of the trace varies considérably depending on sweep speed, ranging from

Shame when that happens; a full complement of tubes is not cheap to source and full calibration will be necessary. Also, the 565 can be prone to crt heater isolation breakdown and HV transformer

I doubt that communication via RS-232 or GPIB would be possible now that the system "hangs" after the error messages at start-up. I don't understand yet where or how an interrupt is generated. Is the

Hey Jack, Despite I'm member of this group for about 2 years, I consider myself still a rookie about Tektronix stuff. Specially because their product catalog is so small... What? Some 3 thousand items

As I said mine was a 2430a and all the cal and setup data was on the two dallas chips, as to what is stored where only Tektronix would know, I just copied the chips and replaced them adding a pair of

This site seems to have repair guides for a load of things : https://www.ifixit.com/ Enjoy. Geoff.

The Dallas chips were totally gone indeed (date code 9106). I can't find in the CSA803A service manual what precisely is stored where. The error T1331 should not prohibit normal operation (at

Hello All: Since I posted the DIY for this item on hackaday.io I let the built Ebay items sell out. However, lately I have been getting requests to purchase this item again. 3 times in this week

You should be aware of a company called Tektronix, which makes the P6042 current probe. DC-50Mz Hall effect / coil First offered in 1969! I think you can find a manual on the web. I have one and

Jeff, The Pioneer, sets were just a little less of a nightmare than Sony, neither had enough volume of sales nor problems to be regular in any way, Mitsubishi were a dream to work on, in my area

When powering on the scope from cold the readout is high by about half a graticule. After 3-5 minutes of warm up the readout drifts to the center of the top graticule. Is this normal for this to

I have a tek 565 that came without tubes, dose anyonehave spare tubes fot this scope ??? Thanks.

Since it sounds like there is a problem with your front panel, I recommend running the diagnostics via RS-232 instead of via the front panel. I'm not sure about the CSA803, but on the 11401/11402,

Did you copy the firmware from the dallas chips? I just did a 2430a and replaced the dalls 1245 with 1230ab 70ns. The scopes calibration is stored here and it isn’t as simple as replacing chips. If

Hi Dennis, Thanks for the detailed explanation of your experiments. Most of what you write matches my experience with the 7T11 setup, but for your triggering experience. Although finicky, it is not as

My recently acquired CSA803 showed power-on Extended Diagnostics errors. These were partly due to died batteries in the Dallas DS1213C smart sockets. I replaced these with MX48Z35 chips but still get