Power Control of Pentodes: 6L6GC & Beyond

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SUMMARY

The discussion focuses on controlling the output power of pentodes, specifically the 6L6GC model. Users seek information on the relationship between plate current (Iplate) and control grid voltage (Vcontrol grid) across various screen voltages. The RCA Receiving Tube Manual and resources like the Frank Phillips 6L6 data sheet are referenced for their comprehensive information on this topic. The goal is to establish a family of curves that illustrates these relationships for effective power control.

PREREQUISITES
  • Understanding of pentode operation and characteristics
  • Familiarity with the 6L6GC tube specifications
  • Knowledge of screen grid voltage effects on output power
  • Ability to interpret tube data sheets and characteristic curves
NEXT STEPS
  • Research the output characteristics of the 6L6GC pentode
  • Study the effects of varying screen grid voltage on power output
  • Examine the family of curves for Iplate vs. Vcontrol grid
  • Explore additional resources on tube amplifier design and optimization
USEFUL FOR

Audio engineers, tube amplifier enthusiasts, and anyone interested in optimizing the performance of pentodes like the 6L6GC.

yungman
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I read a few pages of what BobS posted and I read through the RCA Receiving Tube Manual. But I cannot find any info on the output characteristic and power when varying the screen grid of the pentodes.

Bottom line is I want to find a way to control the output power of a pentodes like 6L6GC etc.
 
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is there not a family of curves Iplate vs Vcontrol grid for various screen voltages?
tomorrow i'll look at mine...

see the Frank Phillips 6L6 link here
http://drtube.com/tubedata.htm
http://www.mif.pg.gda.pl/homepages/frank/sheets/093/6/6L6GC.pdf
around page 5
 
Last edited:
Thanks, this is a lot more complete than the RCA book I have. I have to study it more.
 

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