Quad 303, hiss in one channel after warming up - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Leon Crampin · 30th Jan 2015, 11:55 pm

Apologies of course - I should have said smoothing choke.

Thanks for the picture of the burn mark. It perfectly illustrates the folly of mounting an overrun resistor in this way.

Leon.

AC/HL · 31st Jan 2015, 12:44 am

Quad are a World respected manufacturer, and many of the referenced equipments have survived into old age despite some theoretical shortcomings, as indeed have I.
We can't know with any degree of certainty what influences, or knowledge, shaped the design at this late stage, but perfection, if it ever materialises, would surely rob us of the healthy debate that separates any camp.
We've explored likely reasons for the problem with the OP's particular amplifier. If they don't help, please come back with a new thread.

30th Jan 2015, 11:55 pm	#21
Leon Crampin Octode Join Date: Nov 2005 Location: Surrey, UK. Posts: 1,874	Re: Quad 303, hiss in one channel after warming up Apologies of course - I should have said smoothing choke. Thanks for the picture of the burn mark. It perfectly illustrates the folly of mounting an overrun resistor in this way. Leon.

31st Jan 2015, 12:44 am	#22
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,643	Re: Quad 303, hiss in one channel after warming up Quad are a World respected manufacturer, and many of the referenced equipments have survived into old age despite some theoretical shortcomings, as indeed have I. We can't know with any degree of certainty what influences, or knowledge, shaped the design at this late stage, but perfection, if it ever materialises, would surely rob us of the healthy debate that separates any camp. We've explored likely reasons for the problem with the OP's particular amplifier. If they don't help, please come back with a new thread.