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Old 29th June 2006, 08:51 PM   #1
jim is offline jim  Belgium
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Default Ideas for a tube that heavily distorts ?

Hi,

I would like to know if there are special types of tube that
heavily distort a signal instead of being linear.
This because I'd like to build a distortion-effect with tubes but
something different than overdriven 12AX7/ECC83.
Thermionic Culture for instance uses a 6AS6 tube.
Any suggestions ?

Thanks,
Jim
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Old 29th June 2006, 09:14 PM   #2
Giaime is offline Giaime  Italy
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Some remote cutoff tube? You can find them cheap.
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Old 29th June 2006, 11:31 PM   #3
jlsem is offline jlsem  United States
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Any tetrode.


John
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Old 30th June 2006, 12:00 AM   #4
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dual control tubes: 7 pin: 6GY6, 6GX6, 6HZ6, 6AS6, 6DB6, 6DT6, 5725, 6187, 6954

9 pin: 6LE8, 6BU8, 6KF8, 6MK8, 6GS8, 6HS8 (these have dual plates too)

octal: 6888
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Old 30th June 2006, 12:21 AM   #5
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Look at the 6BN6...

http://www.pmillett.com/etf_sod.htm

Pete
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Old 30th June 2006, 05:47 AM   #6
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Try playing games with a pentode (or tetrode like the other guy suggested). Maybe a EF86 or something simple. 6AU6? Maybe drive the screen with signal instead of grid. Or tie screen with a high value resistor such that it gets sucked down for long sustain.

Don't limit yourself to triodes. How about a vari-mu tube?

jh
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Old 30th June 2006, 10:16 AM   #7
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You could have real fun experimenting with a frequency-changer lke a triode-hexode.
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Old 2nd July 2006, 03:00 PM   #8
jim is offline jim  Belgium
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Quote:
dual control tubes: 7 pin: 6GY6, 6GX6, 6HZ6, 6AS6, 6DB6, 6DT6, 5725, 6187, 6954
What do you think is the best way to hook them up ?
Signal to grid and changing screen-grid voltage for less or more
distortion ?
Feeding signal in both control-grid and suppressor grid ?


Quote:
Originally posted by ray_moth
You could have real fun experimenting with a frequency-changer lke a triode-hexode.
How could I use those ?

Greetings,
Jim
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Old 3rd July 2006, 02:32 AM   #9
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I was experimenting with an old Fender Champ (5C1 series) several years ago when I came across an interesting discovery. The old (really old) Champs used a 6SJ7 pentode (sharp cutoff pentode) for the voltage amplifier tube. If you plug in a 6SK7 (remote cutoff pentode) instead the amp works normally when the guitar signal is low (volume knob on the guitar on 5 or less) as the drive is increased the distortion increases. Driving the amp with a fuzz box set on its cleanest setting produced a unique sound. This sound went away when I put the 6SJ7 back. I never got around to experimenting with that sound.

More recently I was testing out boxes full of tubes trying to find out which types were suitable for clean, undistorted voltage gain. I made a similar discovery. I found that a 6AU6 can be used for clean gain but the similar remote cutoff pentode, 6BA6 would not deliver more than a few millivolts without distorting no matter how much I tried. It may be possible to use this phenomenon to an advantage in a distortion effects unit. The distortion is dependent on the tube current and the screen voltage.
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