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Re: Grounded Grid [message #8665 is a reply to message #8661]

Mon, 10 January 2005 14:12

TubeCraft
Messages: 30
Registered: May 2009

Baron

Rosenblit may have designed this particular preamp, but the circuit has been around for many years. You can read all about it in the circuit guide at the Tubecad website. John Broskie refers to it as a "common cathode" circuit - if you look hard enough, there's a favorable evaluation of Rosenblit version there as well. It's two triodes with the cathodes tied together, hence the name "common cathode" - only the second triode is a real "grounded grid" - the first triode is really a cathode follower. The cathode follower drives the grounded grid.

Not many home audio components could drive a grounded grid circuit directly - typical input impedance of 600R - or less.

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[Message index]

		Grounded Grid Preamp Breadboarded By: GarMan on Fri, 07 January 2005 11:42
		Re: Grounded Grid Preamp Breadboarded By: Manualblock on Fri, 07 January 2005 20:56
		Re: Grounded Grid Preamp Breadboarded By: Russellc on Sat, 08 January 2005 04:02
		Re: Grounded Grid Preamp Breadboarded By: GarMan on Sun, 09 January 2005 19:43
		Re: Grounded Grid Preamp Breadboarded By: Manualblock on Sun, 09 January 2005 19:49
		Sweet! By: Wayne Parham on Sat, 08 January 2005 03:29
		Grounded Grid By: Poindexter on Sun, 09 January 2005 12:26
		Re: Grounded Grid By: GarMan on Sun, 09 January 2005 19:50
		Re: Grounded Grid By: TubeCraft on Mon, 10 January 2005 14:12
		Re:I should have said "like" a cathode follower By: TubeCraft on Mon, 10 January 2005 14:36
		Holy Toledo! By: Poindexter on Mon, 10 January 2005 21:25
		Re: Holy Toledo! By: Wayne Parham on Tue, 11 January 2005 06:24
		Re: Holy Toledo! By: TubeCraft on Tue, 11 January 2005 08:01
		Re: Holy Toledo! By: Wayne Parham on Tue, 11 January 2005 09:08
		Re: Holy Toledo! By: TubeCraft on Tue, 11 January 2005 11:53
		Other sources... By: PakProtector on Fri, 14 January 2005 18:06
		Interstage (or line output) transformers. By: Poindexter on Tue, 11 January 2005 09:54
		Re: Interstage (or line output) transformers. By: TubeCraft on Tue, 11 January 2005 12:15
		Re: Interstage (or line output) transformers. By: Poindexter on Tue, 11 January 2005 13:31
		Re: Holy Toledo! By: TubeCraft on Tue, 11 January 2005 08:11
		Yes. By: Poindexter on Tue, 11 January 2005 09:25
		Send in the Mud Hens... By: PakProtector on Fri, 14 January 2005 14:48
		So-called cathode follower. By: Poindexter on Fri, 14 January 2005 20:26
		Re: So-called cathode follower. By: PakProtector on Fri, 14 January 2005 22:19

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