Quantcast Figure 2-8.Grid operation in a remote-cutoff tube

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
 
2-8 Figure 2-8.—Grid operation in a remote-cutoff tube. In view B, the control grid is at zero potential (0 volts). Just as in the sharp-cutoff tube, electrons leave the cathode and travel along the lines of electrostatic attraction, through the spaces between the grid wires to the plate. In view C, a bias voltage of -6 volts is applied to the grid. Because of the close spacing of the grid wires at the ends of the grid, electrostatic lines of force at the ends are effectively terminated. The lines of force can only pass between the widely spaced grid wires closer to the center of the grid. In view D, the same negative potential -20 volts) is applied to the grid that caused the conventional sharp-cutoff tube discussed earlier to go into cutoff. This voltage is high enough to terminate most of the electrostatic lines of force on the grid wire. But, because of the wide spacing between the center grid wires, some electrostatic lines of force are still able to pass between the center grid wires and reach the cathode. Conduction will still occur in the tube, but at a reduced level. If the grid is driven even more negative, lines of force will be blocked from reaching the cathode, except at the very center of the grid. As you can see, the remote-cutoff tube, by its ability to reduce gain (conduction), handles large signals without going into cutoff. A variable-mu tube such as a 6SK7 with -3 volts applied to the grid will have a transconductance of about 2000 (µ) mhos. If the grid is driven to -35 volts, the transconductance of the tube will decrease to 10 (µ) mhos. This same increase in negative-grid voltage would have driven a conventional tube into cutoff long before the grid reached -35 volts.


Electrical News
Creating an 8x8x8 3D LED Cube: The Base PCB
Creating an 8x8x8 3D tri-color LED cube from the ground...
eetimes.com
Allocating MCU Resources Accurately
When you need a new MCU and new I/O for...
eetimes.com
Experts Call for Secure Sensors
Sensor nodes are the most vulnerable point of attack in...
eetimes.com
AMD Integrates X86, GPU & I/O
Early next year, AMD will ship Carrizo, its most integrated...
eetimes.com
Test Your Way to a Better IoT
Better design and test procedures will lead to much lower...
eetimes.com
12 Startups I Saw at Demo
The consumer Internet of Things sector is getting crowded and...
eetimes.com
Megachips: Japan's Best Kept Secret
In a recent interview with EE Times, Megachips' president and...
eetimes.com
Intel Expects 2015 Mobile Speedup
Intel is back on track with mobile, company officials said...
eetimes.com
Culture Is King in Job Search
Programmers, web developers, and software engineers often assume that technical...
eetimes.com
LEDs Go Color-Temperature & Tunable
The LED manufacturer Everlight introduced what it calls the world's...
eetimes.com
Drag An Oscilloscope Through 6km of Mud?
Sponsor Dave in the 2014 Sydney Mud Run, proceeds go...
eevblog.com
Friday Quiz: More Radar
An EE Times reader submitted our second Friday quiz about...
eetimes.com
Dick Smith – Amateur Radio & Adventure
Dick Smith talks about how he got started, the early...
eevblog.com
Want to Present a Paper at ESC Boston 2015?
If you are interested in presenting a paper on the...
eetimes.com
Transparent Car Shows Automotive's Future
TE Connectivity's clear-plastic, full-size model car shows the latest advances...
eetimes.com
Why No One Leaves Linear Technology
Why culture makes Linear Tech a winner....
eetimes.com
The Messe U-Bahn Crush Business Indicator
Electronica's healthy glow means good things for Europe's electronics sector....
eetimes.com
Automotive Industry Drives Chip Demand
Among all major end use-applications for integrated circuits, the automotive...
eetimes.com
Power Week: Duracell Buyout Tied to Wireless Power, EVs?
The acquisition of the Duracell battery brand by Warren Buffett's...
eetimes.com
What Are You Wearing?
The wearables market is at $6B this year and is...
eetimes.com
 


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +