Pioneer A443 blown up - Page 3 - UK Vintage Radio Repair and Restoration Discussion Forum

Ted Kendall · 22nd May 2020, 11:45 pm

When Quad launched the 405, Ross Walker explained that their policy of launching a new product every few years gave them the opportunity to design bugs out during development rather than patch them over with additional components. Sound idea - except it was followed by six editions of the board...

Nevertheless, I use and like both a 405 and the professional 520 variant.

PJL · 24th May 2020, 11:14 am

I am going to have to give in to my inner voice and move that chassis connection to 0V. It is wrong - wrong - wrong and if not the initial cause, the instability could have been tamed if the CR network on the outputs went directly to 0V. At a guess, this is the consequence of some country variants using an earth.

22nd May 2020, 11:45 pm	#41
Ted Kendall Dekatron Join Date: Jul 2008 Location: Kington, Herefordshire, UK. Posts: 3,675	Re: Pioneer A443 blown up When Quad launched the 405, Ross Walker explained that their policy of launching a new product every few years gave them the opportunity to design bugs out during development rather than patch them over with additional components. Sound idea - except it was followed by six editions of the board... Nevertheless, I use and like both a 405 and the professional 520 variant.

24th May 2020, 11:14 am	#42
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Pioneer A443 blown up I am going to have to give in to my inner voice and move that chassis connection to 0V. It is wrong - wrong - wrong and if not the initial cause, the instability could have been tamed if the CR network on the outputs went directly to 0V. At a guess, this is the consequence of some country variants using an earth.