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My 536 serves as a lab power supply for occasional tube experiments. Otherwise is in excellent condition, complete and functional, and will keep it as such. On winter evenings I sometimes fire it up

Hi Reg, In another thread you say: "Watching the clock period vary by 100 femtoseconds over the course of 15-30 seconds with a 1 s gate time is rather interesting.". I'm not sure whether I read this

If there hasn't been a ripple measurement on the 110V line, now would be a good time. If a diode is open circuit, or a filter is very high ESR, the ripple could be such that the regulator is dropping

Posts crossed again! It sounds very much like you have an excessive current load on the +110V line. If you look at the power distribution diagram, schematic <11>, then the horizontal amplifier would

I guess it is obvious out last posts crossed and also I seem to have a different board revision from you.(serial 708886, Holland, no Q1497). For some reason the series regulator Q1496 (on my

Hello, Acquired an interesting device at a recent swap meet - an Electromyograph ("EDX-1") based on what appears to be a 5000 series mainframe. I posted a few pictures in the photos section under

I still have a 556 which I built my own cart for. I have it next to my test bench and use it often. I bought it with the manual for $25 at a HAM fest about 15 years ago. Other than needing a vertical

Many thanks Roger. At R1423, I find +141.7. Now, my issue is something dragging down the +110. It's currently sitting at 87.3. If I leave the unit on, it will slowly drop even more. Glen

OK, I understand the +105/+160V measurement problem! There is some screen printing on the 475 PCB near Q1490 that says '+105/160V' and it is printed on one of the PCB traces but that trace does NOT

I'm trying to measure the +105/160 from the labeled trace. This trace with +105/160 printed on it ends on the + of C1452. So, basically, I was trying to find +105/160 on C1452. Maybe I'm trying

I have a 549 with Type Z, 1A2 and 1A4 plugins. I love it and it just works, though I need to do some mechanical restoration work on one of the 1A4 channels. I also have a 564 which produces a trace

There's still an interest!? ? I have a 575 (used irregularly) and a 545 (used OFTEN).? ?but it just works every time I turn it on.? ?I haven't needed to fix it in a few years.? ? I completely

David DiGiacomo wrote: .... Ok, when I read the above line, I immediately snorted! Then I realized he was talking about the cooling fan, and not scope aficionados. -Chuck Harris

That is not what the OP is talking about! The 2465 family has a variable frequency calibrator, which always shows a couple cycles of the calibrator signal, regardless of the sweep speed. The purpose

Hi, I am struggling to understand your measurements. The +105/160 is the unregulated supply to Q1496 which regulates the +110V line, so it is hard to understand why the output voltage from the

Hi everyone , I also have 500 series scopes , 547 , 2 x 549 and a 564 . I even have a 661 that still works . I like all these scopes and will hang on to them as long as I have the space as they are

Hi, 7104 is a very special instrument with a MCP CRT, which is very susceptible to damage from excessive brightness and static images. You can easily destroy it if careless, or if the instrument is

I still use a 547 as my main bench scope and a 575 to test semiconductors. Fortunately I have the skills to maintain them. I have several 7000 series and a DSO but don't need their facilities very

I'm unconvinced it could check the measurement accuracy in one sense, since I assume the cursors and calibration signal are derived from the same source. It could be used to check the X linearity and

Hi Marcial, Have a look at W2AEW's YouTube channel here: https://www.youtube.com/channel/UCiqd3GLTluk2s_IBt7p_LjA search there for 'compensation' and watch the probe compensation videos. This