Today, I was watching youtube where a japanese company was telling the internals of moving magnet cartridge. There was a electrical flow loop when the cartridge moves top or bottom end. This was causing distortion. I found that loop is magical. I thought same thing could happen at vacuum tube .

And I thought may be I can learn how to build a vacuum tube, 300b size transistor with controlling electron transfer loops for original or creative tube or say transistor distortion.

Is there single transistor with size of a cola bottle and easy to construct at home by hand ? I learned first transistor was ceramic ? Is it possible to find big size of electronic ceramic or is silicon necessary ?

Mustafa Umut Sarac
Istanbul

 

Today, I was watching youtube where a japanese company was telling the internals of moving magnet cartridge. There was a electrical flow loop when the cartridge moves top or bottom end. This was causing distortion. I found that loop is magical. I thought same thing could happen at vacuum tube .

And I thought may be I can learn how to build a vacuum tube, 300b size transistor with controlling electron transfer loops for original or creative tube or say transistor distortion.

Is there single transistor with size of a cola bottle and easy to construct at home by hand ? I learned first transistor was ceramic ? Is it possible to find big size of electronic ceramic or is silicon necessary ?

Mustafa Umut Sarac
Istanbul

There were devices called "Fetrons" - allegedly equivalent to a selection of small signal tubes.

AFAIK: there are high voltage power JFETs from a very small number of sources - they behave very much like a thermionic triode.

There are certainly high voltage power MOSFETs that are not quite so accommodating.

Most thermionic devices are put in a self compensating circuit with a cathode resistor to sense current - you need a sampling transistor sensing the Rk volt drop to control the positive biased gate.

 

There were devices called "Fetrons" - allegedly equivalent to a selection of small signal tubes.

AFAIK: there are high voltage power JFETs from a very small number of sources - they behave very much like a thermionic triode.

There are certainly high voltage power MOSFETs that are not quite so accommodating. And also depletion mode MOSFETs that are better.

Most thermionic devices are put in a self compensating circuit with a cathode resistor to sense current - you need a sampling transistor sensing the Rk volt drop to control the positive biased gate.

 

Today, I was watching youtube where a japanese company was telling the internals of moving magnet cartridge. There was a electrical flow loop when the cartridge moves top or bottom end. This was causing distortion. I found that loop is magical. I thought same thing could happen at vacuum tube .

And I thought may be I can learn how to build a vacuum tube, 300b size transistor with controlling electron transfer loops for original or creative tube or say transistor distortion.

Is there single transistor with size of a cola bottle and easy to construct at home by hand ? I learned first transistor was ceramic ? Is it possible to find big size of electronic ceramic or is silicon necessary ?

Mustafa Umut Sarac
Istanbul

It is an interesting question. Part of what makes a transistor work is the size of the base region relative to the collector and emitter. Without taking a deep dive into the geometry and operation of a transistor let me propose that scaling a transistor up to the size of a coke bottle would probably not work at all.

Checkout the Early Effect
https://en.wikipedia.org/wiki/Early_effect

Making the base region smaller reduces the Early Voltage.

 

Fetron products started to be manufactured at 1972 and at that day production technology was tragic compared today. IC layouts was cut from red tape by hand.

Now today which softwares are available ? Open source or for money ?

Mustafa Umut Sarac
Istanbul

 

I remember an old Amateur Scientist column in Sceintific American where they made thick film transistors in a kitchen oven. Iirc, the Hfe was like 10.

 

I am thinking two things.

Years ago , one famous guy optimized existing electronic circuit patents and lens patents and repatented them. He used genetic algorithm. I think this was 35 years ago and nowadays softwares might do the same.

Second project is to do the same with existing parts.

VLSI softwares get a order list and output the circuit. I know all are available but please shed some light.

 

I'm not following what you are saying. How come I never heard of this guy with all the patents? I only have two patents and neither one was worth the gunpowder to blow it up. What exactly do you want to do? Please tell me you don't want to start manufacturing 1970's ICs as a growth industry in modern Turkey!

https://www.google.com/patents/US44...ved=0ahUKEwjXvvn76rzWAhWM4iYKHaRMDRoQ6AEIJjAA
https://www.google.com/patents/US52...ved=0ahUKEwj7zpmv67zWAhXBZiYKHU6YBr0Q6AEIJjAA

 

a japanese company was telling the internals of moving magnet cartridge. There was a electrical flow loop when the cartridge moves top or bottom end. This was causing distortion.

A Cathode Ray Tube (CRT) does the same thing. Only they depend on the changing magnetic field to redirect the flow of electrons to strike a screen. If you've ever played with a magnet and an old CRT screen (older TV, not LED or Plasma) you could draw the electrons toward or away from the magnet, depending on polarity. In a vacuum tube, electrons are flying off (boiling off) of one plate and go to another. Depending on the number of grids and their voltages the tube is designed to do different things. Not at all magical to understand that a magnet next to a vacuum tube can distort the flow of electrons.

The transistor works on an entirely different premises. It isn't free electrons boiling off one point, it's whether they liberate electrons or fall into holes. I'm sure I got part of that wrong, but you get the idea. Magnets do not affect transistors - at least not that I've ever heard of. Except for maybe "Hall Effect Transistors", which are designed to sense magnetic fields.

 

https://spectrum.ieee.org/semicondu...he-vacuum-transistor-a-device-made-of-nothing

 

https://spectrum.ieee.org/semicondu...he-vacuum-transistor-a-device-made-of-nothing

Silly title. As someone who has worked with field emission in machines for several decades the major trick to make the device reliable even if it does work. Field emission (Fowler Nordheim Tunneling) by it's nature (even at the nano-scale the local electric fields V/cm at emission tips are very high) is usually eventually destructive to the emission structure even under ultra-high vacuum.

 

I found an fetron modern product called as soft stone, 12ax7 fetron. I read an russian article about it , I think an co inventor wrote it and he says they did similar but worse product. I listened the samples and far from the even moderate product i for me tube was great but fetron was horrible, like listening a soprano healthy and after grip disease. Short , I will try to investigate germanium diodes and they can do. Modern transistors does not match with tube if the price was very low.