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Check the voltages on the horizontal amp schematic on page 193. If those are okay, then move to whatever is before the horizontal amp and check those voltages. If you have another scope you can check

Cool, Jared! Document with pics as you go. I'm sure that you'll learn a great deal and will have good advice for the next person to attempt a probe repair. And if you ever get a chance, I personally

Thanks Raymond, That’s exactly it ??a linearity problem???. That’s the term I was looking for and which best describes the issue. Thank you

Although I don’t understand 90% of all this, it seems very interesting. Maybe you guys have an idea where I should start looking, besides the voltages mentioned earlier. Worth noting that when I

Ok, so repair is back on the table. The seller gave me a full refund and told me to keep the probe. :) I was thinking about how to uncrimp the connection, I think if I cut the cable flush, then dig

Hi Ozan, Yes, it's funny how once you notice something, you suddenly see it everywhere. In the case of the 741, that NPN-PNP mashup was done to work around the terrible performance of PNPs. By

Hi Tom and keantoken, Thank you for the information. I don't want to hijack this thread, maybe we should start a new one if we have more ideas. I have seen series NPN-PNP pairs before, LM 741 input

I'll second Dave Wise's statements. My rules-of-thumb for replacing tantalums - in order of preference: 1. Film caps where they will fit - same or slightly higher capacitance, and generously higher

There could be several causes to the flashing. Sorry if I am repeating some advice you've gotten, as I haven't the patience to read the entire thread. Grid-cathode shorts are not an uncommon problem,

Tam I am crossing my fingers that hopefully the CRT is okay but in the case that it isn't I have another broken 577 which I think I can salvage a CRT from but in any case your offer is appreciated.

Thank you very much, John -- I appreciate it greatly! I had fun this afternoon trying to figure out how the T-coil in the 6131 is wound and connected. It's a quadrifilar winding -- four colors, two

Tom, I'm happy to send the manual along. I think that the P6131 had some major changes over its production history, particularly a new comp box housing design. They show both box types in the

A horizontal amplifier has very different requirements from those for a vertical amplifier. A vertical amplifier is supposed to be reproduce arbitrary waveforms within a large specified bandwidth. It

I have wanted for years to get into technical glass, perhaps 'retirement' will allow..? In the meantime, this fellow would be my candidate for fabrication of the 21st Century

I am just replacing caps on a TDS420 power supply , more than one actually, they looked fine from the top, no corrosion.When I took them off they were all leaking underneath but had not damaged

If the CRT has croaked, do NOT scrap the unit. If my health allows, I will have something for you shortly. Tam -- With best regards Tam HANNA Enjoy electronics? Join 15k7 other followers by

Jared What about a short piece of brass tubing slipped over the crimp area and crimp the center conductor in it. Leon Robinson ?? K5JLR Political Correctness is a Political Disease. Politicians

I am 77 years old (WA7VQR) and I think anyone can do what he wants when he is older than 50. Thanks for saving me some trouble . I just bought some 500 mainframes. Last week I did not know they even

Hi Ozan, on DIYAudio.com this arrangement is known as a "Rush cascode", because it was used by Christopher Rush in connection with THX. But it was always one potential way to make a differential pair

that didn't last long. amusing that they referred to the scopes as having cool "display panels"