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Old 10th August 2010, 02:40 AM   #1
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Default A heptode question

What are Heptodes good for?
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Old 10th August 2010, 02:41 AM   #2
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Multipliers. Also known as mixers, modulators, etc.

Seven Transistor Labs, LLC
Projects and Resources / Electronic Design and Consultation
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Old 10th August 2010, 02:52 AM   #3
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groovin' with some cool amphibians?
"It may not be easy for some to not hear differences, even if they are not there." - Vacuphile,
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Old 10th August 2010, 03:08 AM   #4
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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.
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Old 10th August 2010, 03:16 AM   #5
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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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Old 10th August 2010, 03:43 AM   #6
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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?
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Old 10th August 2010, 12:20 PM   #7
DF96 is offline DF96  England
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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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