Only takes a minute to look things up these days... One paper from '77 indicates their use as a thin film solar energy conversion array. They are claiming that an array using Al-SiO2-Si structure, is

Conservatively, I would estimate 100. Look at how many of "us" exist, than notice that we don't all have things that need their TD's replaced. Commercially, the requirement would be essentially zero.

On, I think all, of the tektronix curve tracers, the forward trace, and the backward trace are equivalent as there is no z-axis control, save for the intensity control. So, unless you are planning to

#photo-notice

Yep, I saw the pictures, but I am not buying it. Tektronix catalogs don't show a 2215A with memory. Not 1985, nor 1986, which were the only two years the 2215A appeared in the catalogs. I am pretty su

It might just be the math. You cannot get a perfectly flat top even with infinite bandwidth... Look up Gibbs Phenomena. Basically, the Fourier combination of sine waves to create a square wave will ne

Hi Mark, I am always willing to do the work. Contact me off group. -Chuck Harris <orangeglowaudio@...> wrote:

Why attribute that to me? I didn't write the statement you quote as being mine, but I can see where it would make sense. Try it this way: Pink paint can be used to repaint a red fire truck, but pink p

Not that I have ever seen. There are some versions of the manual that have two capacitor numbers swapped on the parts diagram... But, if you remove the old, and stuff the new capacitors one at a time,

All of the capacitors on the 2465 supplies have their polarity markers pointing in the same direction. A few are non-polar electrolytics, which don't matter. -Chuck Harris wrote:

Shielded mains cords just move the noise to the next open spot, which is the unshielded plastic boxes, and unshielded ROMEX wiring used in most USA houses. Better would be to put one of the snap-on fe

The noise that is coming back through the feedback channel and being negatively combined at the differential amplifier on the input is not the same noise that is coming in the input. It is random, so

A rule of thumb: If a toroid is painted all over, it is powdered iron. If a toroid is black, but not painted, it is ferrite. If a toroid is covered with a form fitting plastic case, it is a ribbon ste

Hi Paul, If I recall correctly, the pins are a plastic attachment pin, which has a coarse thread. I think I recall that I grab the head with a pair of sharp diagonal cutters, and pry. It will rotate C

Contrary to how a modern person might think they are done, the 2465 (orig) does not use digitizer pots to handle the variable controls on the front panel. They use actual pots. The cursors use a very

That has been discussed to death, but to recap: The 647 was tek's first wide temperature range scope. It operated from -30 to +65C, which would melt the beeswax out of the transformers. Tek did two th

You know that you can include a picture in your questions...right? -Chuck Harris John via groups.io wrote:

Radiation is a bugaboo for many folks. Think of it this way, a little bitty birthday candle emits photons. It will scarcely light a room, leaving the edges dark. You can burn yourself, but don't count

A thoriated tungsten cathode will glow bright yellow. It gives an incandescent light bulb a run for its money. Nobody wants that in a radio tube. So, barium and strontium ceramics are used to get even

There is more radioactive thorium in a coleman gas lantern mantle than is in a transmitter cathode. Typically, the thorium in a cathode is alloyed in the tungsten filament to make it emit electrons at

Hi Bernd, As I said, anything that fits on the usual ferrite core, and uses the usual cardboard former for the winding can be wound with my machine. So, it's all the same to me. I will make up the rec