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In Reply to: RE: What I like about the Crowhurst analysis posted by Ralph on June 16, 2021 at 14:59:51
The grounded grid has more gain than a grounded cathode.And yet the section with the grid grounded *NEVER has more gain.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Edits: 06/16/21Follow Ups:
The point here is that the input side will have voltage loss delivering the signal to the other half that does not have its grid driven.
GG has more gain. Not in this case due to less input. But
So then, with a large Rk, where is this input going?
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
I remember some time back simming the input section of the EAR 509 cct to get my head around it. It uses DC coupled cascaded LTPs; equal anode resistors. The first has a very long tail to a neg supply.
The outputs of the first were ever so slightly different but the second evened that up so the result was the same from the 2nd anodes.
Best not discuss what happens after those stages ;)
I have built with cascaded LTP's too. They do a very fine job IME if the gain is needed. Since I like a medium-mu linestage, two-stage amps have done quite well. The latest are LTP's for balanced drive to the active cross-over.
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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