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" 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 TekScopes.

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

Hi, From my information, it is actually the Coulsdon Amateur Transmitting Society, not Crawley. The URL below gets you to the CATS Bazaar and there are links:

i have a couple of 2465B A5 boards for sale. These are the SMD version and will work in the 2445B, 2455B, 2465B, and 2467B scopes with serial # greater than B05XXXX. They have new socketed NVRAM

Hi Dan, I can help you test tubes on your 575. Like you I was very impressed with George Lydeck's (Glydeck) creativity and when a 575 fell into my lap for $20 it acted as a catalyst for me to build an

Hi Brad, Do you have or know anyone selling an adapter/fixture to match tubes on a Tektronix 575? Or, do you know if there is a schematic I can buy?? Glydeck has a blog about this, but there is no

How about plastic ice cube trays ? HankC, Boston, Wa1HOS

Hi John: Did you find out what it was?

Hello-- I'm offering FS the following original Tektronix manuals-- all are in very good condition except as noted. Please note that some of these manuals are available for downloading at no cost.

Q: How many 'scopes does one person need? A: "Just ONE more"! de G4LUA

I have a 250g ingot of pure Indium. It was purchased during the developement phase of a 500W Band II amplifier module, to see if it could be formed into thermally-conductive washers (RF transistor

On Tue, 04 Dec 2018 04:36:40 -0800, you wrote: If you want, you can color code the envelopes with colored dots from a stationary store, or colored labels. And for the OT? If someone talks about

I attended the hamfest in Phoenix last Saturday. I was able to pick up a TM506 with a DC503 and a PS501 all working for $40. Also 3 2430A along with 2 TDS320 and a TDS420 for $100. One of the 2430A

In the manuals for some 500 series Tek scopes, the TD3A tunnel diode (4.7 mA, used in the astable rather than the pulse generation section) has 'selected' next to it. Does anyone know by what criteria