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Hi Manfred, Just a couple of comments: Manfred Mornhinweg manfred@... [TekScopes] wrote: If you have the 5642 filament voltage (1.3V/T) right on the first two transformers, and they are

You can adjust the gap easily by hand with some fine grit sandpaper. Place the paper on a flat surface, and lap the core until the outer legs are slightly shorter, making the gap smaller. There is

Have you checked the plate swing over the full load range (intensity) of the CRT circuit? Since there's quite a bit of power dissipation in the HV windings, the output loading may not have much

Albert, and all, I have just one doubt left before starting to wind the #3 transformer - which I will wind on a separate bobbin, to avoid destroying #2, which at least works for a good while before

Hello Tek experts: Recently I bought a Tek SG5010 oscillator from eBay. The seller claimed it worked normally. Yesterday I checked its functionality against an AA5001 distortion analyzer.

I have not seen one of those capacitors do this but I have seen other issues which caused similar problem. Usually it is the switches or socket connections to the attenuator modules but I have also

I would try and look at the outputs from the A and B sweep integrators. Usually I find that there is a mechanical problem with the switches not making good connections. For the A and B sweep rates

I have not seen one of those capacitors do this but I have seen other issues which caused similar problem. Usually it is the switches or socket connections to the attenuator modules but I have also

Channel 2 of a 7A18 showed a strange square-wave response on all input settings below 500mV/div. This made me suspect a capacitive or resistive loading error at the back end of the attenuator, as

Hi Pete, You know as well as I do that it is always easy to second guess the designers if you don't know what problems they were faced with. The environment the board is in may have played a part in

Hi Manfred, Thanks for the clarifications. I wish you success in trying the #3(?) transformer with the new design with less winding turns! As to my problems with the 564 I'd better leave that alone

Hello all, I got what I needed and it is fixed. I appreciate all of the help from everyone. Thanks, rich!

Hi, thanks Sean, yeah I'm leaning towards the ps its the only thing that makes sense to me. I Haven't measured anything yet. Just looked at the schematics.

Ok with the A inten or Mix mode - it is even weirder than I originally thought. In A mode all the sweep rates seem to work. In A Inten or Mix mode the A sweep (clear skirt) doesn't work in the

This pdf is invaluable http://www.worldphaco.com/uploads/TEKTRONIX_2465b_OSCILLOSCOPE_CALIBRATION___REPOWERING_THE_DS1225.pdf

John, Great! That gives me a good reference! Yes, so it seems. I also checked the available winding data again, and it agrees. That means that my transformer has the phasing wrong. On the other

That is my post about the DS1230 (32kx8) being replaced with the STK16C88 on a Tektronix 2440 DSO. I have mentioned it here several times. Replacing the DS1225 (8kx8) with the STK12C68 is trickier

I just ran across this post on page 19 of a thread on the eevblog. It looks like the DS1230 can be replaced with an EEPROM based STK16c88 and the DS1225 with a 12c88. This looks interesting, but I

Manfred, ==== pentode behaves basically as a controlled current source, there would be no problem at all if the conduction of the secondaries happens while the oscillator tube is conducting. But

I bought a 2246 back in January and noticed that turning the scale illumination up would cause the display to bloom (expand). I checked PS voltages and found they would sag as the illumination would