UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

john.north · 3rd Aug 2020, 6:41 pm

I have a PW Winton amp with toroidal transformer and fet output transistors which I built in 1979. It’s pre stages were tlo72s.It has been in continuous use with sme3009 arm connoisseur bd1 deck and Nagaoka MP110 cartridge, and Telefunken 710s. I had slight hiss with the volume control at about 11 o’clock.
A few weeks ago I replaced the first stage with a surface mount OPA1642 dual jfet and stage 2 and 3 with OPA2134. I Can now turn it up to about 2 o’clock before I hear any hiss. This set up sounds just as good as a new Denon PMA600NE with Dali spektor2s.

3rd Aug 2020, 6:41 pm	#121
john.north Pentode Join Date: Jan 2013 Location: Immingham, North East Lincolnshire, UK. Posts: 174	Re: Very low noise op amp recommendations? I have a PW Winton amp with toroidal transformer and fet output transistors which I built in 1979. It’s pre stages were tlo72s.It has been in continuous use with sme3009 arm connoisseur bd1 deck and Nagaoka MP110 cartridge, and Telefunken 710s. I had slight hiss with the volume control at about 11 o’clock. A few weeks ago I replaced the first stage with a surface mount OPA1642 dual jfet and stage 2 and 3 with OPA2134. I Can now turn it up to about 2 o’clock before I hear any hiss. This set up sounds just as good as a new Denon PMA600NE with Dali spektor2s.