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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: 580355" data-attributes="member: 144"><p>As indicated earlier, no diagram differences, only component values:</p><p></p><p>R5: 100K, 47K</p><p>R12, R13: 1M, 470K</p><p>C5: 20N, 100N</p><p>Transformer secondary: 300V, 280V</p><p></p><p>The latter values as indicated on the last schematic given by Afroaudio is the latter version. As said, there were too many EL84 failures from G1 run-away with the 1M values and they were forced to lower that. The values were still within the specs for EL84 though the upper limit - apparently that limit was/is ambitious, or the slightly higher than spec.ed h.t. voltage caused trouble, or both. This was also lowered. (The EL84s are running om maximum dissipation, so with some rise in the mains voltage or the wrong tap .... )</p></blockquote><p></p>
[QUOTE="Ampdog, post: 580355, member: 144"] As indicated earlier, no diagram differences, only component values: R5: 100K, 47K R12, R13: 1M, 470K C5: 20N, 100N Transformer secondary: 300V, 280V The latter values as indicated on the last schematic given by Afroaudio is the latter version. As said, there were too many EL84 failures from G1 run-away with the 1M values and they were forced to lower that. The values were still within the specs for EL84 though the upper limit - apparently that limit was/is ambitious, or the slightly higher than spec.ed h.t. voltage caused trouble, or both. This was also lowered. (The EL84s are running om maximum dissipation, so with some rise in the mains voltage or the wrong tap .... ) [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Leak Stereo 20 restoration/mods
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