Gearslutz.com - View Single Post - Negative Feed back-Valve amps?

Marty Shields. · 7th January 2004

Hi There, peoples.
Iv'e built this push pull amp for the lounge room,and thaught i'd introduce some negative feedback.Ive designed the beast using a standard scmitt phase changer with a long tail pair.I thaught i'd take the FB from one side of the pair back to output, now, heres the question;Whats the best way to vary the attenuation?Can I wind my transformer with seperate switched tappings on a seperate fb winding, or should i just switch it thru a few differentresistors and caps? How do they do the ones at MANLEY?
Id be greatfull for your thaughts.
KIND REGARDS,
Marty Shields.
Tasmania aussie.

7th January 2004	#1
Marty Shields. Gear Head Joined: Jan 2004 Location: Tasmania, Aus't Posts: 66 Thread Starter	Negative Feed back-Valve amps? Hi There, peoples. Iv'e built this push pull amp for the lounge room,and thaught i'd introduce some negative feedback.Ive designed the beast using a standard scmitt phase changer with a long tail pair.I thaught i'd take the FB from one side of the pair back to output, now, heres the question;Whats the best way to vary the attenuation?Can I wind my transformer with seperate switched tappings on a seperate fb winding, or should i just switch it thru a few differentresistors and caps? How do they do the ones at MANLEY? Id be greatfull for your thaughts. KIND REGARDS, Marty Shields. Tasmania aussie.