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Audio and Video Talk
Valves / Vacuum Tubes
Please help identify rectifier
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<blockquote data-quote="El Sid" data-source="post: 829386" data-attributes="member: 18550"><p>The <a href="https://www.avforums.co.za/index.php/topic,69061.0.html" target="_blank">DIY EL84 amp</a> I bought from sergiochinelli has a missing rectifier. Based on the connections, possible candidates i found were these:</p><p></p><p><img src="https://i.imgur.com/WtULiQL.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I'm sure that it should be a 5U4, because the 'B+' (before filtering) comes off pin 2 (not 8), which would seem to exclude the GZ34/5AR4. Also, it goes into a 10H choke, which is what is specified in the <a href="http://www.r-type.org/pdfs/5u4gb.pdf" target="_blank">GE 5U4GB Datasheet</a>. Am i right? Of course there could be others that I didn't find, but the 5U4 seems quite common in EL84 applications. It's the empty socket in this pic:</p><p></p><p><img src="https://s9.postimg.org/h2wjtqgb3/IMG_4712.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Also, the preamp valves are ECC81 and ECC82. I'd assume the ECC81 is the first stage and the ECC82 the phase splitter? They were removed from the amp.</p><p></p><p>PS: does anyone have a 5U4 to offload? (if it's the right one) ;D</p></blockquote><p></p>
[QUOTE="El Sid, post: 829386, member: 18550"] The [url=https://www.avforums.co.za/index.php/topic,69061.0.html]DIY EL84 amp[/url] I bought from sergiochinelli has a missing rectifier. Based on the connections, possible candidates i found were these: [IMG]https://i.imgur.com/WtULiQL.png[/IMG] I'm sure that it should be a 5U4, because the 'B+' (before filtering) comes off pin 2 (not 8), which would seem to exclude the GZ34/5AR4. Also, it goes into a 10H choke, which is what is specified in the [url=http://www.r-type.org/pdfs/5u4gb.pdf]GE 5U4GB Datasheet[/url]. Am i right? Of course there could be others that I didn't find, but the 5U4 seems quite common in EL84 applications. It's the empty socket in this pic: [IMG]https://s9.postimg.org/h2wjtqgb3/IMG_4712.jpg[/IMG] Also, the preamp valves are ECC81 and ECC82. I'd assume the ECC81 is the first stage and the ECC82 the phase splitter? They were removed from the amp. PS: does anyone have a 5U4 to offload? (if it's the right one) ;D [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Please help identify rectifier
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