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Hello everybody, I managed to upgrade my TDS620 to a TDS640 by changing resistors on the acquisition-board. I now have 4 channels active and this is working fine and the scope reports that it is a

I changed R803 the 56k anode resistor for V814 to 68k to reduce V800's screen grid voltage, & adjusted the EHT to minimum. The CRT display is a lot less bright but I still have no intensity adj and

Ron, Ok now try to clear 04 diagnostic with EXER 3 as described in other post I sent. Calibration may need to be done if values aren’t correct.

Craig, all pinouts of U2101 have intact connection to the next component and the resistor ladder resistors ohm correctly including connection to +10V Ref. The C2010 measures 15.8 ?F. pac085, I

Hi all, I had a breakthrough over the weekend with my balky 492P. Rapping the VR module with a rubber screwdriver handle brought back the missing ~20 dBm of amplitude in fits and starts, so I

I appreciate it H?kan. Information on the rack mount versions of the 500 series is pretty hard to come by.

Yes, I have a Racal Dana 1998 with higher resolution, high stability option and GPSDO. I would not bother with messing with option 1E (even if it seems easy to do) if it was just for 8 digit

That’s awesome, Craig! Greatly appreciated. I was thinking it was U2550 on schematic <1>, like a dope. I’ll run through it later tonight. Thx, Ron

I'd like to see more discussion about using a Pi, to program the FRAM. The logic levels... AFAIK.. are compatible. Could do it in Python. Why not? -- Roy Thistle

Ron, I have added pictures to photo area albums. Review this album. /g/TekScopes/album?id=301356 Craig

Hi Giueppe, My comments are below. I agree, WR probe may not be useful especially if you have a LA. With WR option back case have a BNC for trigger output. It is possible to re-wire it for 10MHz

Thanks Ozan, area looks different. So it was indeed a 2465 manual, just not the "B variant". That explains why I was never able to find such a panel on a 2465B on the internet. Yes I

Forgot to mention my scope is above 50K SN. Here are the links I have on file: Hope they still work, Mouser's AI is once again blocking me on this browser for being "outdated" and probably not being

pac1085, I copied the original 1991 SRAM data to buffer, then put it on the new SRAM. That generated the 04 Fail. I then put the 1991 SRAM back in the A5, it also failed. The data had been changed

Options manual at https://w140.com/tekwiki/images/f/f9/070-6861-01.pdf and my 2465B with option 9 (CTT/WR) shows "A/B TRIG" That picture doesn't look like a 2465B. Timebase knob and trigger area

To second that I can add the fact that any crt TV will behave like this: EHT too low will produce "picture too big" whereas EHT loo high will show a reduced picture size. Was very common to deal with

Thank you -I obviously had an early download. This versn is much more helpful, especially as it shows how to put the bits back together (all those screws !!) Thanks again. Tim [email protected]>

I guess a simple explanation would be that the higher the accelerating voltage is, the faster the electrons go from the gun to the screen, and spend less time passing the deflection plates, therefore

<Space> John

Ron, Well I have used my GQ4x4 for many years and it works fine for me. But you shouldn't have to keep heating your solder joints if you had quick solder flow on each pin. Seems strange that the