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 __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

10th August 2010, 02:52 AM	#3
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	groovin' with some cool amphibians? __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

10th August 2010, 03:16 AM	#5
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	use grids 2&4 as a line level in, grid 3 for a compressor per Fred Nachbaur?: "Li'l 4x4" Compressor Option __________________ ‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky

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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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