I think you will find the SEM cathode is a tungsten filament and can stand being exposed to air. Its drawback is much lower electron emission than oxide coated cathodes which are destroyed by exposure

There is a rotation coil around the tube but that's not for either focusing or deflection. Don Black.

I think either Stan Griffiths or Sphere has new ceramic strips available plus the silver solder for them. It might be simpler and a better job just to replace the strip. Don Black.

For the really expensive (1/3 $million plus) scopes, they should have a little man built in to twiddle all the dials for you. Oh, I guess that's next years AI models? Don Black.

I've had similar thoughts about data compression. If taken to the extreme we could end up with a one bit file. There would be two possibilities, a "one" file or a "zero" file. But how do you tell whic

Never mind, I'm sure the dog will get his dish back one day. Don Black.

You will probably see a gap in the trace where the TD switches too fast for the scope to see. In order to see the full curve you need big solid low inductance block terminals for the TD and low impeda

I'm intrigued by how small they can now make a 420 watt power supply now. eBay item 280783317481. Don Black.

Physicists spend many billions of dollars trying to beak the fundamental laws. If you did manage it you'd probably get the Nobel prize. Keep trying. Don Black.

Good point George. While the DC voltage isn't important for measuring signal voltages, it it were off by much it could point to other problems, DC voltage checks are always valuable and can often show

Agreed, see my other posting (it's due to the differential input). Don Black.

The DC is the operating bias voltage for the 536 input stage and should be ignored, it's the peak to peak signal voltage you need to measure. However I think there's a trap. The TU-2 calibrator only a

I've checked bot the CA and 536 manuals and neither seem to have the usual waveforms that would indicate the signal level from the plugin to the mainframe. However in the TU2 test plugin (attached) it

Perhaps a plate resistor gone high, likely to increase gain but also effect frequency response. Don Black.

Well, at least if it ever turns up for sale and a member here gets it, we'll know whose it is (unless this becomes a standard mod with dozens of examples). Don Black.

Ahhh, inflation everywhere. Don Black.

I'm on the other side of the world so won't be getting this one. However looking at the photo it strikes me how beautiful the front of these old scopes are. They make most others of similar era look l

Use all your senses. Look and smell and try to see where the smoke came from. It might not be as bad as you fear. Don Black.

You can measure the 24.5 M resistor by putting a lower value resistor in parallel and then measuring. If it's completely open you'll just get the value of the parallel resistor but if it's OK the resi

Maybe there's an opening for Bumblebee sound kits. They would comprise a resistor and instruction kit to connect said resistor across your ordinary capacitor for that special warm sound. There could b