Bondhus makes pretty good hex wrenches, as does Wiha. Mark

What do you mean? Replacing a byte-wide JEDEC SRAM chip with a uC?

I bought some cheesy no brand keys and they're useless. The 0.050 (1/20") key just sort of cams around inside the set screw. What brands do you recommend?

Yes, that's exactly what happened. when the value reached 1A the -8 V supply collapsed to -2 V and the current drops to a value of 600mA.

To be honest I've never worked with memory before; I've a lot more reading to do on the subject of memory emulation with a uC. Any pointers? P.

I've been reading the subsequent reactions to my original post. So far I haven't been able to do anything on my TDS380. Life just got in the way. :-) I'm going to try to remove the PCB this

Thanks, I am getting ready to build a minimum load fixture and wanted to be sure that nothing is required for pin1, I guess I do not need to worry about it. Thank You. Jerry Massengale

Not HP, but the Eico harmonic distortion analyzer used a compactron. I will take compactrons off your hands if you have no need of them.

I looked through the 547 schematics and parts list and did not find any compactrons. Tektronix had part numbers for the 6GF5 beam power pentode and 6M11 twin triode pentode and going by the parts

Hello David, yes, that would be me :-) A standard O-ring 8 mm x 2mm is all it needs. See http://groups.yahoo.com/neo/groups/TekScopes/photos/albums/85295469 Works. Cheers, Magnus

I mean the multiplexing of the memory address, data, and control lines of the memory itself. The alternative is to use a dual port memory but that is a lot more specialized. I have not seen one in a

Thanks Tom, I wasn't really sure while reading the schematics. Thanks for clarifying. As I am not a professional, what would be the suggested way of troubleshooting the error ? I am unsure as well

The 556 dual-beam scope uses several 6M11 tubes (dual triode + pentode) as well as two 6GF5 tubes (beam power tube). As far as I know, this is the only Tek scope that uses compactrons. I've got a

I think the 6M11 is a dual triode Pentode. Don Black. This email is free from viruses and malware because avast! Antivirus protection is active.

I don't think any are used in the vertical amplifiers of either the 547 or 556 (which are nearly identical designs BTW), as these are all transistorized, except the first stage cathode follower which

I FOUND IT. P122-1 is the Line signal for Line Trigger. It is called out on the upper right of the inverter schematic. Took me a while but its there.

Hello, Dan-- IIRC, one of Tektronix's scopes used Compactrons in the vertical-amplifier chain but I don't recall which scope used them or what their type numbers were. I may be

There is a signal sized trace coming from the pin to a via. I could separate the boards and try to follow the trace but hoped someone knew. I looked carefully on the schematics but have not found it

I think it may be unused. My cursory examination did not find any reference in the Service Manual to Pin 1 of J122 or its mate P122. Perhaps someone with their scope open can buzz it out for you.

I 'think' that the 547 used a compactatron and the 556 used several. No current access to manuals or to the scopes & memory is not what it was. Chris HJ