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I have a Tek 465B that had a graticule bulb burn out. I replaced the bulbs, but must have sparked the board to the chassis when replacing it as I have no voltage at the output now. I’m currently

I sure wish Chuck Harris were still around!!! I miss his advise and cross banter from others having so much more knowledge than I. Larry

Also of interest: https://w140.com/tekwiki/images/b/bb/Service_Scope_49_Apr_1968.pdf page 14 shows a quick check method using the sweep sawtooth output on Tek scopes.

Say, Dave, the Vee to Gnd shorted thing may be unrelated, but I will bring up the Vtt appearing to be shorted to Gnd issue anyway.? Saw it first back in the late 1980s when I first worked with ECL.?

Incredulous would be the word that comes to mind when I think how I felt about my diagnosis of U287C being dead in this 7D15. But I could not reason why else I was getting no signal out on pin 14.

Thank you guys! Alan

So, I recently became the owner of a Tek 2445 and low and behold when I got it, it worked. Been doing some reading and took a peek inside and how its running I don't know but it's time for a re-cap. I

?ann sun., 26. des. 2021 kl. 22:36 skrifa?i <quadzillatech@...>: I believe this is it: https://www.mouser.ca/ProductDetail/Eagle-Picher/LTC-7P?qs=MQ89PJz411eJdMnu%252BtznWw%3D%3D . As others

Any chance those could be nearby strong broadcast signals? Especially the 1 MHz & 1.4 MHz, which are in the AM broadcast band (in North America, at least). My location is up against a national park on

Warm up and auto cal. Check battery / contents saved on power down.

I'm looking for some help with my 495P spectrum analyzer. Hadn't used in a while or never noticed, but from zero to about 4MHz there are bunch of spikes at about 1MHz, 1.4MHz, 2.something MHz, etc.

Sort of working - but badly. As a test I tried injecting a sq wave from a cheapo chinese VNA, into the mixer port of the external diplexer, now I see groups of energy peaks pretty much as expected on

It's easy to miss -- the manuals are pretty thick, and if you've been deep in debug mode, it's natural to overlook the operator instructions! -- Cheers, Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205

Duhhhhhh ... I dont know how I missed that ... Thanks all who replied Dave manuals@... -- This email has been checked for viruses by Avast antivirus software.

I'll check mine when I get back home next week.? Just for the hell of it.? Can't hurt to know more about one's gear.? Thanks for the inspiration, Dave and Harvey.? ? ? ? ? ?Jim Ford?Sent

I have an old 7904.? The third knob down (A, B, knob) has a switch (inner) for control illumination, and an outer knob for readout intensity. Harvey

Still have the model 3 scope cart.? Model 203 is gone.? Still have 547 and plug-ins except 1a2.? Also have 2? ?M? ?4 channel? plug-ins.? 547 doesn't turn on.? Carl Hallberg (W9CJH)

I never paid it much mind in the past, but In playing with this old 7904 I notice that the numerical display on the CRT for the plug-ins is a bit bright. Is there a way to turn that brightness down a

It turns out that lack of -15V and yet some other problems are all caused by interconnect cables not seating properly / totally After I got my bearings straight on the power supply regulator board and

He has a ton of some of the best electronic content on You Tube. I have spent HOURS watching Alan explain various circuits and instruments. He is a wonderful teacher. -- Michael Lynch Dardanelle, AR