[Amps] Reducing grid currents and improving gain

William Turner dezrat1242 at wildblue.net
Mon Jan 20 05:12:36 EST 2014

ORIGINAL MESSAGE:          (may be snipped)

n 1/20/2014 12:35 AM, John Lyles wrote:
> A little tube history here:
> RCA designed and manufactured beam power tetrodes such as the 6L6, 
> 807, and 829B to increase power output, allowing the plate voltage 
> swing to go lower without a large increase in screen current during 
> the minimum. 


I was a fan of RCA engineering even back in the 50's when I was a kid 
just getting into electronics. Not only tube design but TV, radio and 
electronics in general. I remember their SyncroGuide system for 
improving horizontal sync in TVs. They took a plain old sine wave of the 
correct sync frequency, turned it into a spike and used that as a much 
sharper trigger for the horizontal sweep. Outperformed anything on the 
market, but now it's just a footnote to history. I wonder how many other 
brilliant inventions of the time will be forgotten? I hope somebody is 
keeping track.  :-)

Those guys way ahead of their time. I never met any of them but I do 
admire them from afar.

Now the old RCA is just a fading memory. Wish I could have worked there. 

73, Bill W6WRT

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