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what's the market for newly produced tunnel diodes?
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
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
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Chuck Harris
· #181176
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what's the market for newly produced tunnel diodes?
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.
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.
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By
Chuck Harris
· #181165
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2nd life for a 575 after resting for 30+ years in the attic
#photo-notice
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
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
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Chuck Harris
· #181088
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TEK 2215A info
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
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
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By
Chuck Harris
· #181042
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More fun with avalanche pulsers
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
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
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Chuck Harris
· #181010
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2440 and 2465B battery/ram replacement
Hi Mark, I am always willing to do the work. Contact me off group. -Chuck Harris <orangeglowaudio@...> wrote:
Hi Mark, I am always willing to do the work. Contact me off group. -Chuck Harris <orangeglowaudio@...> wrote:
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Chuck Harris
· #180980
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Recapping Tektronix 2465
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
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
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By
Chuck Harris
· #180970
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Recapping Tektronix 2465
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,
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,
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Chuck Harris
· #180965
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Recapping Tektronix 2465
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:
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:
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Chuck Harris
· #180963
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Recapping Tektronix 2465
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
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
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Chuck Harris
· #180962
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How to explain how negative feedback lowers noise?
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
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
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By
Chuck Harris
· #180940
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More fun with avalanche pulsers
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
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
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By
Chuck Harris
· #180672
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Tek 2465 (1st gen) - help with A5 board troubleshooting?
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
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
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Chuck Harris
· #180396
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Tek 2465 (1st gen) - help with A5 board troubleshooting?
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
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
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Chuck Harris
· #180341
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To Beeswax or not to Beeswax: that is the question.
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
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
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Chuck Harris
· #180216
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Odd 453A on ebay UK
You know that you can include a picture in your questions...right? -Chuck Harris John via groups.io wrote:
You know that you can include a picture in your questions...right? -Chuck Harris John via groups.io wrote:
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Chuck Harris
· #180168
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Restoring CRT emission?
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
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
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Chuck Harris
· #180078
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Restoring CRT emission?
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
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
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By
Chuck Harris
· #180076
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Restoring CRT emission?
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
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
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Chuck Harris
· #180062
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547 HV Transformer: Bill Schell rewind failed
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
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
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By
Chuck Harris
· #180046
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