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In Reply to: RE: what's the best stopper approach to avoid trouble with 5842q? posted by Eli Duttman on July 18, 2017 at 21:32:11
hi Eli D. and Triode_Kingdom
when I first built it sans any 5842q grid stopper, it oscillated strong enough to pretty much block any audio. I think I removed several tube socket grid pins and just used one stopper around 120 ohm - it seemed to play music pretty well on my old Edgarhorn system but would not be surprised about lurking oscillation.
about where would you expect the 4-10K stoppers to roll things off? What spec/size bead would be appropriate for the heater wiring?
thanks
Karlson Evangelist
Follow Ups:
Eli,
Like the diagram? What advantages and application (transmitting RF?) would use this?
Thanks!
The control grid, is now screening the input( the cathode ) from the output. Dealing with C_Miller was a major driver of the tetrode( and then its improvements, the beam tube and pentode ).
It is not w/o its drawbacks; input impedance is cathode||bias resistor in that particular circuit...which is OTO a positive grid in a grounded cathode circuit.
There won't be a step change in loading when the grid goes positive though...and for power tubes, this is a non-trivial consideration. My next amps are grounded grid finals.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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