I HAVE ADDED AN IMPORTANT NEW FEATURE TO MY AMPLIFIER
My amplifier has six gain stages and two of them can be switched between CATHODE FOLLOWERS and RESISTANCE COUPLED AMPLIFIERS.
CATHODE FOLLOWERS don’t actually amplify the signal but they output in low impedance which is important. My RESISTANCE COUPLED AMPLIFIERS 6CG7s or 6SN7s amplify the sound about 14 times with a high impedance output. Switched as a CATHODE FOLLOWER they are very low gain. A RESISTANCE COUPLE AMPLIFIER is high gain. The forth and sixth stages are both switchable. The sixth stage is actually made up of two tube segments In parallel because it comes after the phase inverter.
With the 4th stage on high and the sixth stage on low much of the overdrive is done by the fourth stage.
With the 6th-stage on high and the fourth stage on low most of the overdrive is done in the sixth stage.
With both 4 and 6 on low there is still enough gain to overdrive the power tubes.
With both tubes on high neither tube can be over driven because the gain becomes too much for the sixth stage. If no overdrive is needed then both can be set on high. If you wish to overdrive one or both tubes with both set to position you need to add an attenuator (device that adjusts the volume level) between the fourth and sixth stage. You can then overdrive at one or both of these stages. This allows the sixth stage to handle over driven signals from the fourth stage and cascade them together. The sixth stage a RESISTANCE COUPLED AMPLIFIER need not to be over driven at this time but it will add more ambience than if it was a CATHODE FOLLOWER.
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