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Do you need tube colorations? Dynamic Microphones
Old 31st July 2010
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Wavebourn's Avatar

Talking Do you need tube colorations?

Some people insist that we love tubes for their specific sweet distortions.

Here is a thingy that allows to control such a "Tubiness".

Try and report, how do you like details, soundstage, etc...

A single channel drawn. For stereo 100K audio taper must be dual. Dial it in and find the sweet spot you prefer.

Very cheap 6J6 tubes were used (1 tube per channel), very simple schematic with few components.

It may be used as a preamp as well, voltage amplification factor is about 20.

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Do you need tube colorations?-harmonizer.gif  
Old 2nd August 2010
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Wavebourn's Avatar

Here is an improved version:
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Do you need tube colorations?-shred-2.gif  
Old 13th August 2010
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Wavebourn's Avatar

This one is designed for a lead guitar. I did not try it yet, though...
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Do you need tube colorations?-shred-4.gif  
Old 13th August 2010
Gear addict

Originally Posted by Wavebourn View Post
Here is an improved version:
Wavebourn, can you just describe the circuit in a little more detail?

I have no experience at all with valves, but this could be fun for a first project.


Old 13th August 2010
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PeteJames's Avatar
Are the ones that don't say for lead guitar for synths?
Old 13th August 2010
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Wavebourn's Avatar

The main idea is, to make a thingy that adds harmonics starting from the 2'nd one, depending on level of signal. The lower is signal level, the lower is order of harmonics.

Some people believe that the truth why vacuum tubes are so sweet is because they add own sweet tube harmonics.

So, I designed a thingy for those who want to add "a tube sound" to something, so they can check, if specific tube distortions are exactly that thing they want, or not.

The first variant was designed to add high 2'nd harmonic and increase it's level with loudness, then gradually increase 3'rd, 4'th, and so on.
The second variant allows to null-out a fundamental frequency so distortions would be more pronounced.

And the last one was designed especially to "enhance" the sound of electric guitars.
Old 16th August 2010
Old 16th August 2010
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Wavebourn's Avatar

Originally Posted by Teddy Ray View Post
According to description their blackbox is just a plain clean preamp with high linear input resistance. Of course, musical instruments with pickups would sound better when connected to such a thingy instead of low and non-linear input resistances of the majority of modern amps and di-boxes. What I propose, is more than that: it is a device that adds specific distortions with vacuum tube profile. The last version is a Gyrator - loaded Vari-Mu pentode. Gyrator allows to vary anode current keeping anode voltage relatively stable. It's output is loaded on a pair of clipping diodes that act also as a rectifier that changes bias of the tube causing slight compression when overdriven.
Old 21st April 2016
Gear Head
Toobd's Avatar

I just noticed a similarity between the harmonizer and the Masco expander circuit I'm using (fig. 5).
Volume Compressors and Expanders
I found that the expander can produce distortion which is discussed in the article.
Old 18th May 2017
Gear Head
Toobd's Avatar
A lot of money for a circuit having two 6SN7 tubes.

I made the Masco circuit here
using 12ax7 tubes instead of 6SL7 tubes (very similar). Recently, I tried replacing the 1 meg resistor after V2b with a 500k resistor in series with a 500K potentiometer to vary the attack and recovery times. Adjusting this control produces some interesting, but subtle effects. When adjusting this control, the effect on the sound produces a dramatic effect at one setting and a less dramatic effect at another setting.
Old 18th May 2017
Just posting to keep an eye on that masco circuit!
Old 19th May 2017
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The last schematic has a Fet right?
Is it going to apreciate the 250 volt your feeding it?
Old 19th May 2017
Gear Head
Toobd's Avatar

There's a good thread on tubed dynamic range expanders here
Electronics Forum -> Tubed Dynamic Range Expanders
A lot of people on the forum are pretty knowledgeable on electronics, too.
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