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Audio and Video Talk
The Vintage Audio Section
Quad II mono-block amplifier question
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<blockquote data-quote="MusicMan_ZA" data-source="post: 1035503" data-attributes="member: 14924"><p>I have obtained a scruffy-looking pair of QUAD II amps, S/N 30773 and 30679.</p><p>They are going to need a lot of cosmetic work, but all the resistors and capacitors have been replaced in 2014,</p><p>(for a total component cost of R82 from Communica in Cape Town!) <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p>I will check all the values, and make sure they are as they should be.</p><p>I have connected them up to my Sansui AU101 in pre-amp mode, and they sound wonderful!</p><p>But my first question/main concern is the following:</p><p></p><p>Valves are (for each mono-block):</p><p></p><p>1 x GZ32</p><p>2 x GEC KT66</p><p>1 x Telefunken EF86</p><p></p><p>and</p><p></p><p>1 x Telefunken ECC83!?!</p><p></p><p>I know there should be 2 x EF86 (original ciscuit).</p><p>I have heard of Triode in Cascode mode mods - but I think then both EF86 valves are replaced by ECCnn valves,</p><p>after the necessary circuit modifications?</p><p></p><p>So what is going on here?</p><p>If no circuit mods, would they even work / sound good (as they do) with an ECC83 just "dropped into" an EF86 circuit?</p><p>Could this have damaged anything?</p><p></p><p>If any mods have been made - which I can't see - what will happen if I remove the ECC83 and put in an EF86?</p><p>I am happy to try this, if it won't do any damage, and either just work, or not work.</p><p></p><p>Any advice?</p><p></p><p>Thanks,</p><p>Johan</p></blockquote><p></p>
[QUOTE="MusicMan_ZA, post: 1035503, member: 14924"] I have obtained a scruffy-looking pair of QUAD II amps, S/N 30773 and 30679. They are going to need a lot of cosmetic work, but all the resistors and capacitors have been replaced in 2014, (for a total component cost of R82 from Communica in Cape Town!) :-) I will check all the values, and make sure they are as they should be. I have connected them up to my Sansui AU101 in pre-amp mode, and they sound wonderful! But my first question/main concern is the following: Valves are (for each mono-block): 1 x GZ32 2 x GEC KT66 1 x Telefunken EF86 and 1 x Telefunken ECC83!?! I know there should be 2 x EF86 (original ciscuit). I have heard of Triode in Cascode mode mods - but I think then both EF86 valves are replaced by ECCnn valves, after the necessary circuit modifications? So what is going on here? If no circuit mods, would they even work / sound good (as they do) with an ECC83 just "dropped into" an EF86 circuit? Could this have damaged anything? If any mods have been made - which I can't see - what will happen if I remove the ECC83 and put in an EF86? I am happy to try this, if it won't do any damage, and either just work, or not work. Any advice? Thanks, Johan [/QUOTE]
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Quad II mono-block amplifier question
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