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wrote: Electro static discharge could have damaged an internal circuit connected to that pin such that it still worked but would fail later. In TTL when this happens, I usually see one of the totem

I have a few other Tek pieces with AMI 08s. It may be of interest that the 68xx family has an instruction, H(alt)C(atch)F(ire) that does nothing except turn the chip into a counter. Seems to be

The scope worked for 10 years with the 6808, so I would say it did not need the ram. I don't know if the 6808 was there because of the service as a replacement(I don't know for sure where all the

!!!! Could just be a random failure of the output driver. An AMI part should be fine, but note that 6808s were sold as RAM-less versions of the 6802, which means the on chip RAM may have failed test.

Jerry, Note that this applies also when you want to check only one channel. Then also the cable should be terminated at the end (the CH1 or CH2 input), not at the SG503 side. So you might have to

First, Thanks to everyone for having this forum my 2445 is back from the dead. A short recap of the last three decades: I bought a 2445, SN B012772 back in 1984, It had been owned by a tek employee

No actually not, a viola is musical instrument like a larger violin, and Viola is a girls name. VOILA is the french word in question. Regards, David Partridge ________________________________ Sent: 19

Viola: http://en.wikipedia.org/wiki/Viola Voilà: http://en.wiktionary.org/wiki/voil%C3%A0 Raymond

Gee, guys, ...lets show some culture on the blog, here. ? Viola is french for "...and there it is..." ? It has nothing to do with violins or fiddling, ...it is even pronounced phonetically "wa-la".

Love the pun! Raymond

I need on piece ( or two) of 155-0042-02, 155-0042-03, 155-0028-00. ( Or any pin for pin replacement) These are the so called Miller Integrator/Reset Generator ICs and are used in several Tek scopes

Thanks Stefan. In this day of digital and handheld T & M, this is antique, but affordable and functional it is... Dave

Buy a used Dranetz? ST

I have a dot! I was wondering why the power LED never turned on, so I tested it and it was bad. I replaced it with another one I had on-hand, and now I suddenly have all the voltages in-spec, and the

Data logging devices are commonplace now days. Many high-end multimeters have such a feature where you can plug the meter up to a power source and record levels over time. But I'm interested in

I added a 10 ohm current shunt to the anode circuit of V20, the 20 MHz amplifier, and used it to test all of the tubes. The anode currents varied from 4.8 to 5.7 milliamps, the gate voltages varied

I figured it out! Removing the top cover and lifting up didn't provide quite enough clearance. But I found if you remove the bottom feet and the cover, the black plastic rails are held in by a single

OK I finally have something on screen! Kind of. I found an open between a blue wire and the fuse, and repaired it with a piece of wire. Now, when I turn it on, It sits there with a blank screen for

I was surprised to find that it does *not* use the same CRT as the 2247A or 2440 series. I wonder if they are interchangeable though. <tmiller11147@...> wrote:

The attached may be helpful in the described situation with Staples. I am fortunate in that I have an 11*17 printer and find that any schematics and/or troubleshooting diagrams I have printed on 11*17