ECC82 in V3 Position of DSL40C???

Robert Herndon said:
I hear that a lot!!!!
Click to expand...
It's not really that any tube gives you more headroom at all.
It's that the 12AU7 (or whichever) is less sensitivity.
It breaks up later, rather than earlier.

The higher sensitivity tube like 12AX7 breaks up earlier. It is the most sensitive of all of them.

Gain: they all have the same gain.
The gain is limited by the power supply voltage.

The 12AX7 more sensitive, reaches limit of gain quicker. Breaks up quicker.
The 12AU7 reaches limit of gain later.
But both tubes will produce the same amount of gain before clipping, limited by the power supply.

So once again, "gain" and "sensitivity" are two different things.
Frequently mixed up, or called "the same thing," which they are not.

The only way you are going to increase the actual headroom, is to increase the power supply voltage.
If you increase the power supply voltage then:
you will have more gain, before limit of gain is reached.
More available voltage = more clean headroom before clipping.
 
Amp Mad Scientist said:
It's not really that any tube gives you more headroom at all.
It's that the 12AU7 (or whichever) is less sensitivity.
It breaks up later, rather than earlier.

The higher sensitivity tube like 12AX7 breaks up earlier. It is the most sensitive of all of them.

Gain: they all have the same gain.
The gain is limited by the power supply voltage.

The 12AX7 more sensitive, reaches limit of gain quicker. Breaks up quicker.
The 12AU7 reaches limit of gain later.
But both tubes will produce the same amount of gain before clipping, limited by the power supply.

So once again, "gain" and "sensitivity" are two different things.
Frequently mixed up, or called "the same thing," which they are not.

The only way you are going to increase the actual headroom, is to increase the power supply voltage.
If you increase the power supply voltage then:
you will have more gain, before limit of gain is reached.
More available voltage = more clean headroom before clipping.
Click to expand...

I've read charts that indicate there is higher transconductance in the 12AT7 in comparison to a 12AX7.

To my ears, the 12AT7 in V4 changes the gain structure in a positive, yet subtle way...
 
eSGEe said:
whats a tube again?
Click to expand...
It's this valve thingee invented by old guys.

1642010091514.png

Johnathan Ambrose Fleming; Unintentional inventor of Chug.
He was sitting in his lab with his Les Paul Standard one evening 1904; suddenly wondered what would happen if music became so loud that it dislodged brain cells....
"only high voltages could do that !" he pondered. "I must build an accelerator."

As you all know the rest is history / auditory nerve damage. Thus Chug was born.
But WOULD he have conducted these insidious experiments, had he known of the future global consequences?
Only history will judge, my friends. Not me; certainly not I.
 
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