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Well I have replaced the U500 and the scope is triggering just fine. However; when I changes Volts/Div scale without changing the input signal the display jumps off center. If I recenter the

Fyi: The jlcpcb cnc factory on youtube...not a small operation. https://youtu.be/YuSApjBn_zY?si=e38M-DFYBbrykJgV

You can use 6AU6 in place of 12AU6. They have identical characteristic, the only difference being the heater voltage, 12.6 V @ 150 mA for the 12AU6 vs 6.3 V @ 300 mA for the 6AU6. You can compensate

Hello, I have a TDS754D. Works fine but I’m having trouble getting some simple screenshots out. I used the hardcopy function, export as .bmp mono color and export to floppy. For some reasons it will

There were actually serious attempts at replacing some tubes with JFET alternatives in very-high-volume applications like telephony (1960s-70s). I think the most well known is Teledyne's "FETRON,"

And other examples of replacing a 6AK8 tube ( triple diode/triode tube ), with a solid state replacement in HF Rx receiver using HV MosFets. https://www.youtube.com/watch?v=KlXMnNx7ZDg

Any possibility that a HV MosFet might be substituted ? LND150 Mosfets have been substituted for a different tube ( the 12ax7 ; which is Not the 12au6 discussed herein for the Tek 575) See:

Common NIDEC or Mineba fan, usually the original can be recussitated if correct procedure is used. Jon

Hi Barry, I think you fixed the root cause of why shorting across C-E of Q8051 didn't work. I was expecting to see the same voltage as if Q7042 was removed (+0.6V) but at this point the regulator

Is there a good solid replacement? Thanks, Monte I have bought many of these for 2465/67B scopes over the years with good results. eBay listing: Nidec Beta V FAN TA300DC 12V 0.16 Amp A33315-16

I've read through a lot of posts regarding the replacement fans. Is there anything outside of the parts description from the service manual that I need to take into account? Both my 'scopes need the

I switched to x1 and the MAG light tuned off. Only UNCAL is still on, even though I have already cleaned the pot. Switched the triggering back and forth between AC and DC. Set the Source switch to

Ozan, I found a broken trace which I repaired. I also swapped out a few transistors. Today I am measuring -0.48 volts when I short across C-E of Q8051. I understand that 2N2222A is a lower

Yes I just downloaded it. Will spend some time reading it.

CH 2 is the same. Vertical Position knobs work in Beam Finder mode.

Thank you Ben for the detailed info - I really appreciate it! Here are my measurements for the reference points you listed: Junction between C369 and L369: 12.04V L343 (any side is fine for just

Thanks for the reply. Today I unsoldered about 20 chips that were near the capacitors to see if there were any interruptions in the conductor tracks. I didn't find any interruption. How do you think

- Adjusted Ch1 var and the "uncal" light is off, as I mentioned in post #207706 - The var for A & B time base is in detent, as you can see clearly in my video. That said, I cleaned the pot and it

Jeffrey, The uncal lights and x5 lights are still on. The uncal lights should turn off when you go to the detent position which you will feel. As others have said, the switch could be dirty making

Still trying to get a bit further without having to take measurements may yield more info. If both channels show the same behavior: Since bad contacts are rather frequent with old equipment like