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That is brass, not gold. the top plating (nickel or something) is on top of a brass blank.? not as exotic as you might think. brass is very easy to engrave, which makes it popular for this task. when

When I had it in the A mode I measured approximately 20nS delay between gate A and gate B but my sweep out was just plain rubbish noisy nowhere near triangle and at wrong place. I found better place

An update on my 127. I got the power supplies running (one 6080 and a 12AX7/ECC83 were down to air) and the rails were all within spec, though +225V was a whisker low at 221V. While I was testing the

You're right, Eric! But, by now, I believe everyone reading this post knows that. And it is what I said right from the beginning, triangle generator is not working (I mean, I didn't say there is no

sorry, I don't really follow - would you mind rephrasing? thanks! <Brucekareen@...> wrote:

I’ll get all the appropriate caps tomorrow. I haven’t worked on the interior yet. Eric, how easy is it to replace those filter caps? It seems like a real hassle because of the ceramic strips on

As Dave wrote this could be because of missing load at W991. Does adding a 470-ohm 0.5W to ground from W991 reduce it to ~ 5.2V? Ozan

Cleaning it up revealed something else I had never seen before. Not that I’m an expert or anything, but this is new to me. The lettering of serial number is gold. I’ve always seen it black... Has

Hi Ondrej, Less than perfect videos are OK. My main concern is misunderstanding the state of the 485 and suggesting the wrong path. It is important to look at B gate during 5/2/1n setting of A because

I started a video about 5 times always ended up interrupted or doing some mistake I can send you link to those attempts because if you forgive the complete blabbering you may see something but my

What is the time/div setting? Your gate pulses are about 2x the length of what I measure in 1ns/div setting. Polarity of the sweep is opposite of what it should be (note that internally it has a

Negative feedback reduces the amplitude of signals that do not appear at the input point of the feedback circuit. Thus, it will reduce noise generated within the feedback loop through degeneration,

An employee does something wrong.? Management tells them about it.? They try to do better.? Management isn't satisfied, so they have another talk.? This cycle continues until management is

https://photos.app.goo.gl/rV6gSvehN2uzbaes7 This is what I get, the a sweep signal is very weak, under 20mV at the back of the scope but it looks fairly close to what you get

Giorgio, 80-R82DC4100DQ60J for 1mfd 80-R82CC4470DQ30K for the three 4,7mfd on the power supply board 647-ULD1C221MPD1TD for 220mfd 647-ULD2C100MPD1TD for 10mfd. These are 160V. 647-UHE1C121MED for

Is the 5.2V rail at 11V because it is unloaded ?? Dave

Bonjour à tous Great topic, and as Dr Lee mentioned, historical links. We must deal separately the noise of the input signal vs internals noise of the amplifier opamp, resistors, etc. There is also

Other time bombs: there are study cases made for transporting gear. Typically they have an aluminum extrusion frame with plywood panels that have been laminated with Kydex plastic sheet, and those

Hi, "You cannot control what you do not measure" is how I introduce negative feedback to my freshmen. An example that they all seem to get right away is a thermostat. I go from there to explaining how

The following photos have been updated in the Sampling with 3S2 ( /g/TekScopes/album?id=261250 ) album of the [email protected] group. * GR oscillator display with Russian D42