There is also a TDS540 on there too, but if that is the type I am thinking of, it can take a HUGE amount of work to get the AQC board working. I have two 575's if anyone is anywhere near central, PA (

Does anyone have an STL file for the trigger shaft and knob on a TDS3000 series scope? I broke the damn shaft on one of mine. I could probably superglue it, but printing a new one would be most satisf

I saw your post on Facebook; great job. Question: Are 535 transformers easy to get? I would imagine the 535 still around have been fixed up and restored. The 547 is a better scope than a 535, so to sa

" successor 013-0055-00" I found one, new in the original bag/instructions, never opened on EBAY for $50. I jumped on that and got it ordered right away; thank you! Dave

I can see that useful for making an extender cable. I wonder if there ever were any official extender cables for the 500 series?

Thank you!

My fav: https://eds-inc.com/cap.html EDS 88A

" If you were building a replacement for one of these delay relays (hypothetically speaking, maybe for a 533A), would it be enough to have a timer that cut a relay in after a fixed time? Is that reall

" For instance https://frank.pocnet.net/sheets/084/6/6NO45T.pdf . Albert" Albert; thank you; I had been thinking of this too. In industrial controls, we would use on-shot (Time Delayed) relays too, bu

" It does look like a nice scope, if you like the fly-by-wire instruments." It's not as easy to operate as a Siglent or Tektronix TDS3000 series. It does have a very nice display. Even though it's Win

They are very, very nice scopes, but they are not quite as easy to use as other digital scopes. You can not always just reach up twist knobs and what not. A mouse hooked up does help, despite the touc

No, no, no, sorry, the 6AU6 tubes. I fixed the problem. I cheated. I kept going back and forth between the "good" and "Weak" module. The differences were so subtle. I do think I have a few weak 6AU5 t

Sorry, I accidentally hit enter and the message was sent before I was done. The funny thing is it seems one tube being weak appears to drag the gain of both channels down. Both channel one and channel

Well, it's down to the 6AU6 tubes. I got them confused now between the good module and the bad module. I can make the bad module the same as the good module by swapping the 6AU6 tubes. I now have the

"You should check the voltage divider from pin 15 of the plugin connector. That pin needs to sink 150 mA at 75 volts in all plugins. The 75 volts is derived from the +100 in the mainframe dropped thro

Hello again Jeff, " calibration process on the plug-in?" I just did the resistance test on both the high gain modules and the weak one. Everything looked the same except the filament resistance. Pin 1

Not fully. With the exception of some trim caps that can not be reached without and extender (I'm not sure how they adjusted those), the only pot inside in the Vertical Position/Range pot. The front p

I thought the spam was a problem on my end with GMAIL sorting spam in the Forums tab. So, it is a problem with the spam coming in the group? terrell.michael.a@...> wrote:

Hello all, Type CA. All tube sockets cleaned, switches cleaned and the two pots that can be clean are cleaned. 10volts will only read as 8 volts on either channel. I swapped the output tube (common to

...or P850 Probe gmail.com@groups.io> wrote: