Hi Jim, Since your question is not related to the problems in the "7T11 horizontal memory" thread I opened this new topic for my answer. With the 7S12 you would also need an S-53 and an S-51 head for

Say, since I have the 7S12 and 7S11, is there any reason to obtain a 7T11 or 7T11A?  Aside from the fact that it's another cool piece of Tek gear to own, I mean.  IOW, do I have a justification

" @Dave, when you have had the bad NVRAM installed, how did the no-boot situation look? I.e., was it also a white screen, no beeps and no relay clicks, or did it at least show the DPO splash screen?

Just to be sure that the fault is in the 7S11, you might check that the terrible rise time is also present when you use the 7S11 in combination with an ordinary timebase unit in stead of the 7T11.

@Dave, when you have had the bad NVRAM installed, how did the no-boot situation look? I.e., was it also a white screen, no beeps and no relay clicks, or did it at least show the DPO splash

Another thing to consider (if you are feeding tube filaments via AC power) and want to minimize hum is to use twisted pair wiring to distribute AC power to the tube filament socket connections (rather

Yep, a colleague several decades ago told me if you ever work with audio tubes, try D.C. for the heater instead of A.C., you'll like it.  I never forgot that, although I have not worked with tubes

Here's another one, and you may want to think of this in a high end application. The original heaters (called filaments) were the same as light bulbs, simply tungsten wires that were heated to boil

Does anyone have any dead TM500 plugins they want to sell (cheaply)? I'm looking for a couple of carcasses to build some custom modules with. thanks Paul -- Paul Amaranth, GCIH | Rochester MI,

Chris, I'm envious that you have a CSA803 and SD24!  I had that setup about 25 years ago at my employer the time.  Nice! Have to make do with 7904, 7S12, 7S11, and two S-4's in my garage lab for

How electrically similar is the 3L10 to the 1L10? Components are numbered similarly. But clearly the circuits are different, at least at the output, since 560-series plug-ins must directly drive the

Brad, Thank you! My main interest is audio tubes. I have >1000 different tubes, mostly audio output and small signal/preamp tubes. I also own a Hickok 580A tube tester and a Tektronix 575 Curve

" Unfortunately, holding the B-trig during power up makes no difference. " My experience: When I replaced by NVRAM with a fake one I bought in China, the scope would light up, but would not boot. I

Hello, Dan and the group-- Thank you for your inquiry. Here's a column I wrote for Test & Measurement World magazine (subsequently absorbed by EDN) which describes my version of a tube-test adaptor

Aha! Your news is indeed good :-) I put the 7T11 in to a slot next to my 7S11 and I now have a horizontal sweep in the rea ltime ranges. It was U512 when I killed it, but I swapped it with U572 to

George, These are really outstanding!  Thank you very much, Dan

Hi Chris, I might have good news for you. The real time multivibrator doesn't work when you don't have a 7S11 adjacent to (or otherwise connected to) the 7T11. So then the memory gate is always

Dan, Dennis’ curve tracer is the more complete solution, but if you’re interested in the one on my blog its in the file section of

I have now replaced the faulty R541 and R542. I also found that U572B, a Tek special op-amp, was dead, I think due to a careless slip of my scope probe. For now I've kludged a 741 in its place. Joy of

Hi Chris, One more suggestion. Set the 7T11 for MANUAL scan. Set the test scope at 5 or 10 us/div, trigger from the 7T11 pulse output. Then probe all TPs 512, 515, 525, 555 of the horizontal