Tube-based nanostructures are nanostructures made of connected tubes and exhibit nanoscale organization above the molecular level. 
Tube-Based Crossovers +200v-200v 6N1P 6N1P 300 40k +3.3v 1M 40k 1µF 1M 300 +6v R1 R2 C1 C2 10v This is a 2nd order lowpass filter that can be ... Tube Based Filters
Tube-based buffers provide no gain, but do offer a low output impedance and can deliver the current needed to drive capacitance-laden cables.
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NOTE: The Solicitations and topics listed on this site are copies from the various SBIR agency solicitations and are not necessarily the latest and most up-to-date.
Part 1 of 2: Build overview---This is my Canard Tube. It incorporates numerous airframe component designs that Ed has posted videos of on his channel ...
Vacuum Tube Based Audio Processing Devices Handmade in the U.S.A.
Just behind tube phono preamps and tube headphone amplifiers, the largest number of circuit requests I receive is for tube-based crossovers. Using tubes rather than ...
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Reprinted with permission from August 1 QST A the national association for Amateur adio ® www.arrl.org furnished both the pentode and the beam