Question about step up in 300B PP amp

Tubenstein · 4th February 2012, 08:31 AM

Hi!
I'm assisting my friend to source some parts for his project and he is working on a pretty interesting amplifier that is a 300B push pull amplifier with 300B for driver and input stage as well.

He is thinking about to use the Lundhal 1:1+1 input transformer => 2 x 300B PP => 1+1: 2+2 IT => 2 x 300B PP => 1+1:1+1 IT => 2 x 300B PP => output transformer with 6.6K primary.

Don't you guys think it has adequate gain to drive the output??

zigzagflux · 4th February 2012, 12:42 PM

Gain depends on your speakers and preamp output. My only comment is an input transformer prefers very high impedance on its secondary; a 300B is anything but. As wild as the design may sound with all those 300's, I think you'll be better off with a first stage having less capacitance at the grid.

4th February 2012, 08:31 AM	#1
Tubenstein diyAudio Member Join Date: Aug 2011	Question about step up in 300B PP amp Hi! I'm assisting my friend to source some parts for his project and he is working on a pretty interesting amplifier that is a 300B push pull amplifier with 300B for driver and input stage as well. He is thinking about to use the Lundhal 1:1+1 input transformer => 2 x 300B PP => 1+1: 2+2 IT => 2 x 300B PP => 1+1:1+1 IT => 2 x 300B PP => output transformer with 6.6K primary. Don't you guys think it has adequate gain to drive the output??

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4th February 2012, 12:42 PM	#2
zigzagflux diyAudio Member Join Date: Oct 2006	Gain depends on your speakers and preamp output. My only comment is an input transformer prefers very high impedance on its secondary; a 300B is anything but. As wild as the design may sound with all those 300's, I think you'll be better off with a first stage having less capacitance at the grid.

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