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Audio and Video Talk
Valves / Vacuum Tubes
Mars 5-10 stereo - update
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<blockquote data-quote="Ampdog" data-source="post: 1072134" data-attributes="member: 144"><p>With due respect to to Charles, the circuits of both the Leak 2020 and TL12 are such general circuits that I do not view the suggested changes so much as changes to the particular circuits, rather than ideas pointing the way forward at the hand of said circuits for further designs. Many amplifiers followed these topologies, the Mullard 510 and 520 to name just two.</p><p></p><p>That said, the shown 2020 schematic still indicates the EL84 grid resistors as 1M, an error for which Leak paid dearly. This value falls outside the maximum allowed grid return values of 470K, only quoted as such in later data sheets. (It was found that values exceeding that caused grid run-away conditions with certain brands, as a result of which dozens of 2020's had to be recalled. Here some valve manufacturers themselves were initially in error!).</p></blockquote><p></p>
[QUOTE="Ampdog, post: 1072134, member: 144"] With due respect to to Charles, the circuits of both the Leak 2020 and TL12 are such general circuits that I do not view the suggested changes so much as changes to the particular circuits, rather than ideas pointing the way forward at the hand of said circuits for further designs. Many amplifiers followed these topologies, the Mullard 510 and 520 to name just two. That said, the shown 2020 schematic still indicates the EL84 grid resistors as 1M, an error for which Leak paid dearly. This value falls outside the maximum allowed grid return values of 470K, only quoted as such in later data sheets. (It was found that values exceeding that caused grid run-away conditions with certain brands, as a result of which dozens of 2020's had to be recalled. Here some valve manufacturers themselves were initially in error!). [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Mars 5-10 stereo - update
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