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Thank for the link to the replacement drive. I re test with a bunch of different floppy disks, even a new sealed one. And it definitely seems like the drive is to blame. I’ll order the replacement

I second the faulty floppy drive in the scope few of the scopes I've had on the bench were a bit flakey. I recently converted my TDS784D and TDS794D to use the Gotek floppy adapters which work

Hi Barry, My comment about 2N2219A vs 2N2219 was: - "A" version is in the Tek replacement recommendation - "A" version fT matches to original Tek part - "A" version has higher Vceo of 40V. Plain

Ozan, I see -32.5V across at the output Q7042 was found to be bad when I started several days ago. I did not have one so I used a 2222A temoprarly. I have a couple "2N2219 PBFREE Central

Thanks Siggi That did the trick... works perfectly now. John w.

Top and bottom in brass was about 85usd. (0.1mm, as milled).

Assuming you have tried different discs my first choice would be a bad drive, most likely the one in the scope. If you can do GPIB you can get screenshots that way too. /H?kan

Hey John, Did you try the auto DC balance yet? Disconnect any probes or signals from CH1/CH2, then press the input coupling for CH1 and CH2 up at the same time. Wait and see whether this cleans it

BTW, if that's not a secret, can you tell us how much JLCPCB charged you for your CNC'ed part? Thank you.

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