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Audio and Video Talk
Valves / Vacuum Tubes
Leak Stereo 20 restoration/mods
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<blockquote data-quote="Ampdog" data-source="post: 574149" data-attributes="member: 144"><p>The Stereo 20s mostly under my attention were as per p.3 of the above reference.</p><p></p><p>I will list my alterations only here, and proceed in a next post with technical discussion, so as not to bore those not interested.</p><p></p><p>R5 = 100K </p><p>R12, R13 = 470K (on some schematics = 1 megohm) </p><p>R18 = 15K - R18K</p><p>C5 = 470nF/630V</p><p>C9 = 150pF</p><p>C10,C11 and C12,C13 = 2 x 50 + 50?F/500V JJ capacitor</p><p></p><p>R.C in parallel with R5 (on some amplifiers but not on schematic); R = 4K7, C = 120pF in serie, across R5</p><p></p><p>Resistor over 15 ohm output terminals: 1K 5W (not in any versions, see next post)</p></blockquote><p></p>
[QUOTE="Ampdog, post: 574149, member: 144"] The Stereo 20s mostly under my attention were as per p.3 of the above reference. I will list my alterations only here, and proceed in a next post with technical discussion, so as not to bore those not interested. R5 = 100K R12, R13 = 470K (on some schematics = 1 megohm) R18 = 15K - R18K C5 = 470nF/630V C9 = 150pF C10,C11 and C12,C13 = 2 x 50 + 50?F/500V JJ capacitor R.C in parallel with R5 (on some amplifiers but not on schematic); R = 4K7, C = 120pF in serie, across R5 Resistor over 15 ohm output terminals: 1K 5W (not in any versions, see next post) [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Leak Stereo 20 restoration/mods
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