ORIGINAL MESSAGE:
On Wed, 22 Jul 2009 20:01:52 -0400, "Carl" <km1h@jeremy.mv.com> wrote:
>
>Grounded grid where the grids are at DC and RF ground is not the same as
>applying DC voltages to those elements that are still grounded for RF.
>Comparison examples would be GG 813's vs the THP HL1KA.
>
>The latter is called Super Cathode Driven for a reason that easily
>differentiates it from a simple GG cathode drive.
REPLY:
I guess we will have to agree to disagree. In both circuits the drive is applied
to the cathode (or filament). As long as the grid and screen are maintained at a
steady DC level, whether ground or some DC level, and have zero RF applied,
the circuit function is identical - the cathode is driven, the grids are not.
As to the Super Cathode Driven circuit somehow being different from GG, The only
thing I see is the matter of DC bias. In terms of RF functioning, what exactly
is the difference?
73, Bill W6WRT
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