I have one of the 2216's and the original owners manual (in poor condition) and would love to find a service manual (electronic preferred). If there are any updates on this thread it would be

I'm guessing that scope didn't have any amplifiers or sweep. That meant you had to have big enough voltage signals to deflect the beam directly. It would be interesting to see more detailed

Bob Albert via Groups.Io wrote: Hello-- And before that, in 1934 General Radio offered an oscilloscope (the model 687) with "useful" response to 130

Not so much a problem, but that the traces are running at about a 60 hz rate, so 10 traces refreshes about 6 times a second (or less, since it's a half cycle).  That's where the flicker/refresh rate

The story I heard was that Dumont himself said that his company would always be the leader in oscilloscpes, somewhat akin to the president of Ford saying the Japanese could never erase the 20 year

Been some time (several years, now retired) since I used mine and loaned it to a friend a few days back to check out-he thought he might buy it- but he reckons it's got too low a refresh

A strange decision for DuMont since they were deeply involved with television. -- Richard Knoppow dickburk@... WB6KBL

From what I was told back in the 60's, it was a Marketing decision. Dumont believed there was no market for high frequency scopes so they concentrated on low frequency (500 Kc max) high sensitivity

I have just acquired one of the above 1ns cables for the s-6 & s-52 & 7s12. Does anybody have info about how to use this cable..... Specifically about bending (or not !) ?

https://vintagetek.org/clone-scopes/

Hi all, again some progress today: I had to rebuild the entire DAC reference circuit using new resistors -flying wire style- because they were all toast and many traces were either gone or

I have two TM-506 and one TM-515 mainframes that I am parting with. All in good (for their age) condition, and worked last time they were powered up (about 10 years ago).They are free, but you will

Greetings, I’m not sure it is fair to call a Dumont scope a Tek knock-off. Allen B. Dumont opened his company in the 1930’s and was producing an oscilloscope around 1943. Tektronix was founded

Hi all, I got that dam'd TDS520 to repair. Powered up, it works perfectly. Then, the screen gradually expands and then darkens in about 20 mins. The process initially is very inappreciable, and

Oops, almost wandering off to the other side! Raymond

I have some PG506 modification kits that that are new parts and include this transistor. Contact me off list electronixtoolbox@... if you are interested. Craig

...and for troubleshooting the HP 4270A Automatic Capacitance Bridge, which to my surprise contains a 5V BNC socket inside, marked "Logic Probe"... That 4270A contains lots of other sweets, like a

There were several sets.  3 probes, logic clip (maybe) in a pouch.  Ditto  (minus the current probe but definitely with the clip) in a box, optimized for TTL.  Much larger box with a clip on logic

Yes the logic clip is part of the set: HP545A = Logic Probe HP546A = Logic Pulser HP547A = Current Trace Probe HP548A = Logic Clip You can find them sometimes as a set on ebay, but usually selling

I had misfortune and snapped off transistor's leg beyond repair. Tektronix part number 151-1108-00 Unfortunately this is enhanced N-Channel Mosfet Q758 (VN99AK) in high amplitude section. Some