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Audio and Video Talk
The Vintage Audio Section
Quad 303 restoration
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<blockquote data-quote="Family_Dog" data-source="post: 899277" data-attributes="member: 82"><p>Herman,</p><p></p><p>You might do well to browse through this UK forum:</p><p></p><p><a href="https://www.vintage-radio.net/forum/showthread.php?t=137769&highlight=quad+303+restoration" target="_blank">https://www.vintage-radio.net/forum/showthread.php?t=137769&highlight=quad+303+restoration</a></p><p></p><p>and here:</p><p></p><p><a href="https://www.vintage-radio.net/forum/showthread.php?t=137769&highlight=quad+303+restoration" target="_blank">https://www.vintage-radio.net/forum/showthread.php?t=137769&highlight=quad+303+restoration</a></p><p></p><p>They recommend using the original 2N3055 output transistors in place of modern components, for reasons of stability. I'm inclined to agree with this, the rust can be removed with a pot wire-mesh scraper (what does one call these things??). Their suggestion is to replace the power supply caps with higher value electrolytics (6800uF) as this will improve the bass response somewhat, equivalent capacity caps back in the days when the 303 was built were simply too large physically to fit.</p><p></p><p></p><p>-F_D</p></blockquote><p></p>
[QUOTE="Family_Dog, post: 899277, member: 82"] Herman, You might do well to browse through this UK forum: [url=https://www.vintage-radio.net/forum/showthread.php?t=137769&highlight=quad+303+restoration]https://www.vintage-radio.net/forum/showthread.php?t=137769&highlight=quad+303+restoration[/url] and here: [url=https://www.vintage-radio.net/forum/showthread.php?t=137769&highlight=quad+303+restoration]https://www.vintage-radio.net/forum/showthread.php?t=137769&highlight=quad+303+restoration[/url] They recommend using the original 2N3055 output transistors in place of modern components, for reasons of stability. I'm inclined to agree with this, the rust can be removed with a pot wire-mesh scraper (what does one call these things??). Their suggestion is to replace the power supply caps with higher value electrolytics (6800uF) as this will improve the bass response somewhat, equivalent capacity caps back in the days when the 303 was built were simply too large physically to fit. -F_D [/QUOTE]
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Audio and Video Talk
The Vintage Audio Section
Quad 303 restoration
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