Hello Rick, may you use the e-mail massner@... please. Best regards, Stephan

the voltages on the vert position pot wipers is as follows fully ccw=3.6v,halfway point =1.2v,fully cw =3.6v.

Here is a PDF of the datasheet for the Greyhill 71BDF30-02-2-AJN switch that was recommended for the tester. The stop pins are shown on page 11. < http://www.farnell.com/datasheets/20309.pdf> If

Greetings Stephan, A quick message to ask whether the TM506 is still available and, if so, whether I can put in my request 🙏 Thank you, Rick.

The vintageTEK Museum has just released a new version of the 4051 Rampack, It is the same form factor as a rompack, and can store 2MB (equivalent to 7 DC300 tapes) of programs and data in rewritable

Dear all, if anybody is interested in the following parts, please write me a PM, please. Mainframe TM506 (working unit) including Word Recognizer/Delay WR501 (without cables) Digital Delay DD501

All teh plugins are spoken for as are the 7603 and 7613 -- Oz (in DFW, Texas USA) N1OZ

I have a small device that uses a 9600 baud rs-232 connection for communication that's not working correctly. I thought I could use my 308 to take a look at the data stream and I can't seem to get the

7B92, S/N B052568, No Sweep, Help! Thanks Miguel, TP321, and R765, have ~60mv, ½ usec pulses. So pulses but probably not functional. I went back and checked carefully on all pins of U310 and

I'm building a replacement U400 from discrete surface mount components. I'll let you know how it works out.

--- Base voltage at Q387 doesn't point to a failure by itself. We need voltages at other nodes to tell which component failed. This was the list in the earlier message: Voltage at bases of Q350,

Do you have pulses at TP321?

If I change the sweep speed such that there are more cycles/division, the hook seems to stay in the same place but intersects the first cycle just a bit. Essentially, the hook doesn't seem to change

7B92, S/N B052568, No Sweep, Help! Since it has been almost a year since my 7B92 arrived in my new-to-me 7904 I’ve decided that it is time to make it work. I’ve re-posted with a new title since

It would be good to know whether the "hook" changes if you change the sweep speeds (both) and what the nature of the changes, if any , are. Stephen Menasian

Jeff, Swapping boards is a good way to determine problems. Swapping ICs would be next to see if any are bad. Removing the trigger light is easy. It snaps in. Pry the black cap of the back. You can

So I got a second 7B92, and this one mostly works (TIME/DIV shafts are bent, trigger lamp does not illuminate, something wrong with ALT horizontal mode when TIME/DIV knob is pushed in, and delayed

I added a photo here: https://groups.io/g/TekScopes/photo/252850/3326143 Thanks, Barry - N4BUQ

That's correct. Only in mixed mode. Thanks, Barry - N4BUQ

It sounds to me like the beam is being "unblanked" a little early and you are seeing part of the retrace. Are you saying that you only see this in mixed mode? Not in regular sweep mode? -- Jeff