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Incidentally there are some handy tricks in there. As a case in point, the DAC_MSB_CLK and DAC_LSB_CLK address ranges are defined in that order, each 0x40 bytes in length. When writing the DAC,

can anyone recomend a russian replacement td that may be ok in this scope?

can anyone suggest a russian td part number that may work with this scope so i can order from ebay,cheers.

Nope, the 6808 MPU only has 4 interrupt vectors, and they're all at the top of memory, from 0xFFF8-0xFFFF.

Siggi, do the locations 0x8000-0x9FFFF contain interrupt vectors which may need to be modified? That would be the main reason that I would expect random bits of memory to be remapped from ROM to RAM.

Dave, EXCELLENT Advice. That "Troubleshooting Your Oscilloscope" document is excellent. The sweep logic loop is the most challenging part of these scopes, for my poor brain at ;least. I had to read

Don't forget the wealth of useful information from the TekWiki site. Even more to the point, the 465 has it's own repair section: https://w140.com/tekwiki/wiki/465/Repairs When sorting out how to fix

Hey y'all, I've always been curious to peep at the firmware in my Tek scopes, so for giggles I installed Ghidra and pointed it at the ROMs from my 2467. Snooping around a bit, while reading the

Hugo, Anything that is in a socket is subject to corrosion, it is a good idea to check anything that in mounted in a socket. There is also the matter of the crappy "TI" IC Sockets, a problem which has

Hugo, To follow up on Michael's excellent advice, I have also seen socketed DIP ICs in a 475 (very similar to the 465) where the pins have become tarnished in the socket and are no longer making

Hugo, Once you get that LVPS ripple under control, I would take a close look for the presence of the various signals coming into and going out of the "A & B Sweep Generator Circuit". This is schematic

Phil, I have been repairing 475's lately, so I have been using the discs from E-bay. I really like the "standoff board" concept and I will contact Barry off list to see if he has some of these boards

I think the examples shown by Rehorn are too nice. The signals are periodic and exactly an integer number of periods fits in the sampling period. He must have made use of that information to arrive at

you will be dealing with mechanical issues when recapping. here are some ideas: this is the best solution i have seen when it comes to replacing old caps with new:

If you look at https://w140.com/tekwiki/wiki/Russian_tunnel_diodes you will find the spec of most of the Russian tunnel diodes you are likely to find. You need Germanium, not Gallium Arsenide,

Please excuse the TYPO in the subject line. That should read: Looking for 7704A - J20L (Power for Readout) I hit the 9 key by mistake and didn't notice it until I saw the message coming back from the

Could someone please point me to the schematic location of J20L on the Main Interface board for a 7704A? According to the schematic for the READOUT board, the cable for P34L (the power rail connection

can noone give me russian replacement td part numbers then that may work in this 453?

Michael. Im afraid the ripple is all over the place, and not able to see any sawtoot pattern at Q1038. Will order up new caps for psu and dismantle the board for access. Will order up for both scopes,

Stancor P-8191 or Thordarson 26F65 is a 6.3V primary, 6.3V secondary, 1.2 amp, with 5kv isolation. No idea where you could find one, though...