Dynaco 400 amp mods

dognut · 10th March 2009, 10:16 PM

Hello to all. I picked up a clean,running dynaco 400 amp. Are there any mods that need to be done or any mods that are routinely done to this model? Going to drive it with a phase liner 4000 pre amp & 4 bose 501series4 speakers.Thanks, tom

Ragnwald · 10th March 2009, 11:50 PM

Dognut, you can read this to begin with.

And have a look here.

Perhaps Erno Borbely is the designer of this beast?

Don Nebel · 21st March 2009, 04:20 PM

I remember reading a post by James Bongiorno several years ago. He stated that he was the man behind the Dynaco ST400. The Dynaco ST400 driver stage was based on the Sid Smith designed Marantz 15 and the series output stage was designed by Jame Bongiorno. Check out his interveiw at TNT audio.http://www.tnt-audio.com/intervis/bongiorno_e.html

Ragnwald · 21st March 2009, 09:48 PM

Ok, thanks.
Also Erno Borbely, owner of Borbely Audio, designed many circuits for Dyna's ground-breaking solid-state components in the 1970s.

10th March 2009, 10:16 PM	#1
dognut diyAudio Member Join Date: Oct 2007	Dynaco 400 amp mods Hello to all. I picked up a clean,running dynaco 400 amp. Are there any mods that need to be done or any mods that are routinely done to this model? Going to drive it with a phase liner 4000 pre amp & 4 bose 501series4 speakers.Thanks, tom

21st March 2009, 04:20 PM	#3
Don Nebel diyAudio Member Join Date: Jan 2006 Location: Kentucky	I remember reading a post by James Bongiorno several years ago. He stated that he was the man behind the Dynaco ST400. The Dynaco ST400 driver stage was based on the Sid Smith designed Marantz 15 and the series output stage was designed by Jame Bongiorno. Check out his interveiw at TNT audio.http://www.tnt-audio.com/intervis/bongiorno_e.html __________________ Mechanic with a soldering iron

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10th March 2009, 11:50 PM	#2
Ragnwald diyAudio Member Join Date: Feb 2008 Location: Gotland	Dognut, you can read this to begin with. And have a look here. Perhaps Erno Borbely is the designer of this beast?

21st March 2009, 09:48 PM	#4
Ragnwald diyAudio Member Join Date: Feb 2008 Location: Gotland	Ok, thanks. Also Erno Borbely, owner of Borbely Audio, designed many circuits for Dyna's ground-breaking solid-state components in the 1970s.

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