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

Ted Kendall · 2nd Dec 2017, 8:30 pm

The quarter track erase head is of different inductance - easiest way to deal with it may be to find a complete quarter track oscillator card.

Two hole heads had gone by 1974, when the A700 was launched - that machine was single hole from day one. I think the changeover was during Mk II - new, harder heads came in during Mk III, but all replacements available now will probably be of this material (Revodour) by default.

2nd Dec 2017, 8:30 pm	#7
Ted Kendall Dekatron Join Date: Jul 2008 Location: Kington, Herefordshire, UK. Posts: 3,675	Re: Revox A77 head mounting The quarter track erase head is of different inductance - easiest way to deal with it may be to find a complete quarter track oscillator card. Two hole heads had gone by 1974, when the A700 was launched - that machine was single hole from day one. I think the changeover was during Mk II - new, harder heads came in during Mk III, but all replacements available now will probably be of this material (Revodour) by default.