
glpg80
Well-known member
I've been putting in a lot of hours into this design and have finally finished a prototype differential amplifier design with successful simulation. I've created a brand new differential amplifier that has better than 0.5ms settling time swinging over 170Vpp!!
What does this mean?
My design will produce a better low end response, better top end detail, all while providing better vacuum tube life. Your effects loop tone won't degrade and you won't need to worry about tone suck from effects loops in your amplifier anymore. This all stops with Radiotron Engineering
The current standard long tail pair that exists in every guitar amplifier in existence since the 1950's that utilizes vacuum tubes hasn't changed one bit. Everyone overlooks this critical part of a guitar amplifier due to its complexity and ability to be just good enough. But as high gain amplifiers continue to demand more of vacuum tubes and effects continue to get increasingly complex, this is a critical stage I found needed immediate resolution.
Here's a simulation of a 50W EL34 Class A/B amplifier utilizing a standard long tail pair design:
Here is Radiotron Engineering's new design:
What does this mean?
My design will produce a better low end response, better top end detail, all while providing better vacuum tube life. Your effects loop tone won't degrade and you won't need to worry about tone suck from effects loops in your amplifier anymore. This all stops with Radiotron Engineering

The current standard long tail pair that exists in every guitar amplifier in existence since the 1950's that utilizes vacuum tubes hasn't changed one bit. Everyone overlooks this critical part of a guitar amplifier due to its complexity and ability to be just good enough. But as high gain amplifiers continue to demand more of vacuum tubes and effects continue to get increasingly complex, this is a critical stage I found needed immediate resolution.
Here's a simulation of a 50W EL34 Class A/B amplifier utilizing a standard long tail pair design:
Here is Radiotron Engineering's new design: