UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - REVOX A700 Transport Control and Capstanboard: Underdesigned transistors?

Michael Maurice · 24th Oct 2017, 12:13 am

I think the reason they used the TBA931 is because on switching off, the +12V supply falls quicker than the -12V. That could induce a DC current which could magnetise the heads.

24th Oct 2017, 12:13 am	#8
Michael Maurice Moderator Join Date: Feb 2006 Location: Wembley, Middlesex Posts: 7,225	Re: REVOX A700 Transport Control and Capstanboard: Underdesigned transistors? I think the reason they used the TBA931 is because on switching off, the +12V supply falls quicker than the -12V. That could induce a DC current which could magnetise the heads. __________________ Forum Moderator http://www.michaelmauricerepairs.co.uk/