Like I always do when I am ________ (bored, curious, etc... Fill in the blank), I was nosing around wikipedia and ran across this gizmo. Never heard of one before.
If, as I understand it, the transistor replaced the vacuum tube, that would mean that a MOSFET is a solid state Thyratron???
You can read about it here:
http://en.wikipedia.org/wiki/Thyratron
The first part (...used as a high energy electrical switch...) is the basic definition of a MOSFET as far as I know (but then again, I know so little)
Kevin
Thyratron
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The mosfet replaced the tube just as the transistor did, only operates on a little different principal (much like the tube) which is transconductance. However when looking at the transistor as replacing tube type triodes, the mosfet with dual gate elements could be viewed as replacing the tube type tetrodes.
Re: Thyratron
The transistor replaced valves (tubes) due to commercialpsycho wrote: If, as I understand it, the transistor replaced the vacuum tube, that would mean that a MOSFET is a solid state Thyratron???
rewards (size, cost, simplicity of power supplies, portability).
The transition for electrical engineers schooled on valves
was a steep learning curve.
Basically a valve is a voltage controlled resistor (like a FET)
and a transistor is a current controlled resistor, not very
linear, and prone to self-destruction (thermal run away).
FETs were discovered before transistors, but had to wait
until the semiconductor industry 'caught up' to be
a commercial product.
A Thyratron (or the similar Ignitron) is a voltage triggered
switch, and does its best work in high power circuits.
Present day examples are to be found around the
semiconductor equipment industry (for high power
spluttering and plasma etching and cleaning duties)
where MOSFets wouldn't be economical.
I have one or two in the 'serious glass' gallery of my
valve museum. I think they're sexy. About the size
of a thermos flask! Although the tiny ones are/were
associated with nuclear weapons.
- Karl Williams
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Sure, and Happy New Year! (Haven't seen you post here for a while - what are you working these days?)Karl Williams wrote:Can you post some pictures of your valve museum?
I don't have access to all my PIX form here, so this is a
taste... (plus I don't want to clog this forum - not sure
many of us are into hollow state electronics)
(1) Minature TV CRTs typically used in TV camera viewfinders.
Far right is a 40mm tri-phosphor colour CRT (world's smallest?)
(2) Video camera tubes.
(3) Amglo low pressure 'strobe' tubes
(4) Four generations of TV camera tubes:
(L to R)Plumbicon 1963, 3 ins Image Orthicon 1941, 4.5 ins Image Orthicon 1959, Iconoscope 1939
(5) Serious Glass Collection (circa 2002)
(6) Annual Cleaning
(7) A pair of Eimac 100th/VT218 75W RF Triodes
(Rare to find two with intact filaments!)
(8) 330mm Photoplotter magnetic Deflection CRT and frame
- dacflyer
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very nice glass !
i wish you was local, i'd love to see more,and up close..
in pic 3. are theose a type of strobe tubes ?
and in pic 5 in the glass case, what tube is that in the very lower right with the big pins?
and in pic 8, whats that thing
in the glass case i also seen some nice lamps too.. i like and miss the 1,500 watt incadescent lamps. you only can find quarts lamps that bright now days @ 220V. i liked the big bulb 115v versions for 2 reasons..
as a yardlight,. they lit up instantly, and unlike a HID, they came back on instantly if needed. HID's you almost have to wait 20 min for a restrike.
i wish you was local, i'd love to see more,and up close..
in pic 3. are theose a type of strobe tubes ?
and in pic 5 in the glass case, what tube is that in the very lower right with the big pins?
and in pic 8, whats that thing
in the glass case i also seen some nice lamps too.. i like and miss the 1,500 watt incadescent lamps. you only can find quarts lamps that bright now days @ 220V. i liked the big bulb 115v versions for 2 reasons..
as a yardlight,. they lit up instantly, and unlike a HID, they came back on instantly if needed. HID's you almost have to wait 20 min for a restrike.
Yes (and no...) On the left is a very rare neondacflyer wrote: in pic 3. are theose a type of strobe tubes ?
indicator that was used in only one product -
The 1937 Mills Studio jukebox as visual displays
for tone controls. The other three are low pressure
discharge tubes from Amglo. These were used for
strobes but also (and more likely) for decoration.
These are the inventions of Andrew F. Henninger, Jr.
(Who held many patents in this field).
A tungsten "sand bulb" used in movie setdacflyer wrote:pic 5 in the glass case, what tube
is that in the very lower right with the big pins?
lighting. At the end of the day the glass would be
dark from tungsten deposits. The cure was to agitate
the bulbs in a machine. The tungsten granules sealed
in the glass envelope swirl the deposts off!
A precision CRT (probably used for photoplotting).dacflyer wrote:pic 8, whats that thing
The face is a 330mm (12 ins) round bulb. The
deflection coils and various beam alignment coils
are on precision metal slides for "tuning" the spot
size and astigmatism. There's a video amp on the
CRT socket. The frame is about 900mm (33 ins) long!
The CRT was constructed by Thomas Electronics
in Wayne, NJ.
Yep. I have several more but they're too big todacflyer wrote:in the glass case i also seen
some nice lamps too..
fit my current display cabinet. I've added a
couple of "serious glass" triodes (in the 1500Watt
class). Some of the bigger ones are in a storage
locker, along with X-Ray tubes and a bunch of Tek
CRTs and few other odds and ends. I don't like the
ceramic/metal power tubes, and the all glass are
typically pre-WWII and under 2kW.
I have a non-working VT- 122/ WL-530 triode
(the grid collapsed) from an SCR-270 Radar
(Not the one that famously failed to accept the
detection of the invading Japanese air strike
on Pearl Harbor). Nice glass, nice providence.
I've seen the actual SCR-270 radar as its now
on display at a private museum in Baltimore, MD.
Yes, we witnessesd the evolution of thedacflyer wrote: i like and miss the 1,500 watt incadescent lamps. you only can find quarts lamps that bright now days @ 220V. i liked the big bulb 115v
"Edison" lamp from its maturity and mass production
to almost total obsolescence in a human lifetime.
I have a hole in my collection as I've not found adacflyer wrote: yardlight,. they lit up instantly, and unlike a HID, they came back on instantly if needed. HID's you almost have to wait 20 min for a restrike.
low pressure sodium vapor/neon start lamp.
They have been used for street lighting for decades.
Most contemporary sodium lamps are high pressure
types.
You would certainly be welcome to visit! Any collection
should not be kept hidden from visitors!
I've edited the pics to add your numbers (duh...I
should have made captions the first time).
collection
Nice pictures and collection Bigglez.
evahle
evahle
- Karl Williams
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