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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

On Wed, 5 Dec 2018 22:11:12 +0000 (UTC), you wrote: > 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

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, USA

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 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