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Re: the Schematic [message #31713 is a reply to message #31712]

Tue, 24 January 2006 17:03

PakProtector
Messages: 935
Registered: May 2009

Illuminati (2nd Degree)

Nope...remember, this low impedance stuff is at the other end of a high impedance device. The grid resistor, or grid choke. For most power tubes, 100k is good. It is a reasonable compromise between loading and isolating.

For valves like the 1619/1624 or triodes like the 2A3, some makers suggested inductive coupling to ground. Either the secondary of an IT or a grid choke. For a pure resistive element would load the previous stage too much.

Hence Galahad, with its 10k plate load. Even a 2A3( which seems to accept over-spec grid circuit resistance values ), a 60 or 70k might be a better idea...:)
cheers,
Douglas

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[Message index]

		Bias supply By: PakProtector on Sat, 21 January 2006 06:30
		the Schematic By: PakProtector on Tue, 24 January 2006 09:55
		Re: the Schematic By: Damir on Tue, 24 January 2006 15:21
		Re: the Schematic By: 2wo on Tue, 24 January 2006 16:36
		Re: the Schematic By: PakProtector on Tue, 24 January 2006 17:03
		Re: Bias supply By: Manualblock on Wed, 25 January 2006 10:01
		Re: Bias supply By: Damir on Wed, 25 January 2006 13:49
		Re: Bias supply By: Manualblock on Wed, 25 January 2006 16:11
		Re: Bias supply By: Damir on Wed, 25 January 2006 23:28
		Re: Bias supply By: Manualblock on Thu, 26 January 2006 07:59
		Re: Bias supply By: Damir on Thu, 26 January 2006 11:17
		Re: Bias supply By: Manualblock on Thu, 26 January 2006 12:40
		Re: Bias supply By: Damir on Thu, 26 January 2006 13:04
		Re: Bias supply By: Manualblock on Thu, 26 January 2006 15:03
		Should you consider Anything involving high voltages novice work? By: Old Brown Eyes on Thu, 26 January 2006 13:14
		Re: Should you consider Anything involving high voltages novice work? By: Manualblock on Thu, 26 January 2006 15:02
		Latest Seth schematic By: Old Brown Eyes on Fri, 27 January 2006 05:55
		Re: Latest Seth schematic By: PakProtector on Fri, 27 January 2006 09:19
		Re: Latest Seth schematic By: Manualblock on Fri, 27 January 2006 09:22
		yes it does... By: PakProtector on Fri, 27 January 2006 13:30
		Re: yes it does... By: Jeff Lessard on Tue, 31 January 2006 12:53
		Re: yes it does... By: PakProtector on Tue, 31 January 2006 16:47
		Re: Should you consider Anything involving high voltages novice work? By: PakProtector on Thu, 26 January 2006 18:08
		patience... By: PakProtector on Thu, 26 January 2006 18:18
		Re: patience... By: Manualblock on Thu, 26 January 2006 20:56
		Galahad Amp By: Wayne Parham on Fri, 27 January 2006 09:11
		Re: Galahad Amp By: Manualblock on Fri, 27 January 2006 09:22
		Re: Galahad Amp By: PakProtector on Fri, 27 January 2006 09:27
		Re: Galahad Amp By: Wayne Parham on Fri, 27 January 2006 10:37
		Re: Bias supply By: 2wo on Sun, 29 January 2006 18:22
		ooooohhhh! neat By: PakProtector on Tue, 31 January 2006 17:13
		simple circuits By: PakProtector on Wed, 01 February 2006 17:42
		MOSFET D-S voltage By: PakProtector on Wed, 25 January 2006 14:42

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