A heptode question

ChipTube · 10th August 2010, 02:40 AM

What are Heptodes good for?

Sch3mat1c · 10th August 2010, 02:41 AM

Multipliers. Also known as mixers, modulators, etc.

Tim

aardvarkash10 · 10th August 2010, 02:52 AM

groovin' with some cool amphibians?

ChipTube · 10th August 2010, 03:08 AM

Ok, cool... I've been testing my stash of tubes and found a 6SA7 that's in really good shape and was wondering if it could be used for anything in a guitar amp.

PeteMcK · 10th August 2010, 03:16 AM

use grids 2&4 as a line level in, grid 3 for a compressor per Fred Nachbaur?:
"Li'l 4x4" Compressor Option

ChipTube · 10th August 2010, 03:43 AM

ok, Pete, let me see if I'm anywhere close to understanding this....

grids 2 & 4 wired together for a line-in input and grid 3 as instrument input with the compression fed back into it like in the Li'l 4x4?

DF96 · 10th August 2010, 12:20 PM

Heptodes are noisy. They were designed for mixing or gating, yet with good isolation between the two signal sources. One of the input grids may have variable-mu characteristics which could be used for a compressor.

10th August 2010, 02:40 AM	#1
ChipTube diyAudio Member Join Date: Jun 2010 Location: DeKalb, IL	A heptode question What are Heptodes good for?

10th August 2010, 02:41 AM	#2
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Multipliers. Also known as mixers, modulators, etc. Tim __________________ Seven Transistor Labs Projects and Resources

10th August 2010, 02:52 AM	#3
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	groovin' with some cool amphibians? __________________ "Folks, you can't prove truthiness with information. You prove truthiness with more truthiness. In a process known as truthinessiness." - Stephen Colbert, The Colbert Report

10th August 2010, 03:16 AM	#5
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Western Sydney	use grids 2&4 as a line level in, grid 3 for a compressor per Fred Nachbaur?: "Li'l 4x4" Compressor Option __________________ Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency

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10th August 2010, 03:08 AM	#4
ChipTube diyAudio Member Join Date: Jun 2010 Location: DeKalb, IL	Ok, cool... I've been testing my stash of tubes and found a 6SA7 that's in really good shape and was wondering if it could be used for anything in a guitar amp.

10th August 2010, 03:43 AM	#6
ChipTube diyAudio Member Join Date: Jun 2010 Location: DeKalb, IL	ok, Pete, let me see if I'm anywhere close to understanding this.... grids 2 & 4 wired together for a line-in input and grid 3 as instrument input with the compression fed back into it like in the Li'l 4x4?

10th August 2010, 12:20 PM	#7
DF96 diyAudio Member Join Date: May 2007	Heptodes are noisy. They were designed for mixing or gating, yet with good isolation between the two signal sources. One of the input grids may have variable-mu characteristics which could be used for a compressor.

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