The resistor also wastes B+ voltage. At the quiescent point, the resistor drops a significant fraction of the supply. With B+ = 300V and a 100kΩ load, the plate voltage sits around 170V — the output can only swing 170V peak before hitting the supply rail, and even less in the other direction before grid current flows.
Now replace the resistor with a constant current source (CCS). A CCS has infinite impedance at AC — its loadline is perfectly horizontal on the plate curves. Result: RL → ∞, the gain formula simplifies to Av ≈ µ. The full amplification factor is realized. The voltage swing approaches 2×B+ because the CCS maintains constant current regardless of plate voltage. Power supply rejection improves dramatically because supply ripple creates no current variation through the infinite-impedance load.
Moj 'chlopski' rozum i logika jakos nie potrafia wykumac jak byloby to mozliwe, by sygnal mogl wzrosnac do 450Vpp przy napieciu zasilania 300VDC.
Screenshot 2026-06-12 at 8.24.09 AM.png
Moglby ktos madrzejszy podpowiedziec jak to byloby mozliwe? Zerkajac na https://pearl-hifi.com/06_Lit_Archive/1 ... ontrol.pdf, strona 3 sugeruje "Now the power supply only provides DC operating current as the CCS provides isolation between the power supply and the triode." wiec czy w tym wypadku tylko Rload ma znaczenie i to ono wyznacza, jak daleko sygnal moze oscylowac?
Z powazaniem,
(wcale niemadry) Tomek
Nie masz wymaganych uprawnień, aby zobaczyć pliki załączone do tego posta.
Pozdr,
-Tomek Drabas
________ "One should not pursue goals that are easily achieved. One must develop an instinct for what one can just barely achieve through one's greatest efforts."
—Albert Einstein tomdrabas.com
Tak wlasnie czytam tez w ksiazce Jones'a (Valve amplifiers). Ale tamta strona raczej nie analizuje odwracacza... Perpetuum mobile lol
Pozdr,
-Tomek Drabas
________ "One should not pursue goals that are easily achieved. One must develop an instinct for what one can just barely achieve through one's greatest efforts."
—Albert Einstein tomdrabas.com
No wlasnie moje AI tools tez krzyczaly, ze 'tak se ne da, Panie.' Ale jako, ze ja nie ufam AI (i uzywam glownie do korygowania bledow w pisowni lub jako 'szukaczke') to wolalem sprawdzic z madrzejszymi
Pozdr,
-Tomek Drabas
________ "One should not pursue goals that are easily achieved. One must develop an instinct for what one can just barely achieve through one's greatest efforts."
—Albert Einstein tomdrabas.com
Pozdr,
-Tomek Drabas
________ "One should not pursue goals that are easily achieved. One must develop an instinct for what one can just barely achieve through one's greatest efforts."
—Albert Einstein tomdrabas.com
Pozdr,
-Tomek Drabas
________ "One should not pursue goals that are easily achieved. One must develop an instinct for what one can just barely achieve through one's greatest efforts."
—Albert Einstein tomdrabas.com
