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Audio and Video Talk
Valves / Vacuum Tubes
Tube based Audio amplifiers - web page
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<blockquote data-quote="Ampdog" data-source="post: 854728" data-attributes="member: 144"><p>Ah - Yes!!</p><p></p><p>An excellent overview of the many designs hatching forth in the 50s - NOSTALGIA!</p><p></p><p>The main thing not mentioned (unless I missed it) is that the writer is Mr John Linsley-Hood, himself an eminent audio designer from England, from the previous century. Pleasant and informative reading and an eye-opener regarding what could be considered the start of high-fidelity equipment. Mr Linsley-Hood also pioneered a few simple transistor designs, some of which are still in use some 60 years later (obviously now with more modern transistors).</p><p></p><p>Apart from a few errors* this article is an authoritive piece of history, setting straight many misconceptions even in its brief coverage.</p><p></p><p>Note from me: The important British article "Amplifiers and Superlatives" by Williamson and Walker; Wireless World, Sept. 1952; is worth looking up by those wishing to be set straight regarding the U.L. debate.</p><p>_________________________________________________________________________________</p><p><span style="font-size: 11px">* Mainly, certain erroneous connections of the screen bypass capacitor from screen to earth, not cathode, of pentode stages (e.g. the Leak TL12 circuit and others).</span></p><p><span style="font-size: 11px"></span></p><p><span style="font-size: 11px">Secondly: The detailed description of the Sonab amplifier more follows fig.17 than fig.16, particularly regarding the input circuit (some component values in fig. 16 are wrong).</span></p></blockquote><p></p>
[QUOTE="Ampdog, post: 854728, member: 144"] Ah - Yes!! An excellent overview of the many designs hatching forth in the 50s - NOSTALGIA! The main thing not mentioned (unless I missed it) is that the writer is Mr John Linsley-Hood, himself an eminent audio designer from England, from the previous century. Pleasant and informative reading and an eye-opener regarding what could be considered the start of high-fidelity equipment. Mr Linsley-Hood also pioneered a few simple transistor designs, some of which are still in use some 60 years later (obviously now with more modern transistors). Apart from a few errors* this article is an authoritive piece of history, setting straight many misconceptions even in its brief coverage. Note from me: The important British article "Amplifiers and Superlatives" by Williamson and Walker; Wireless World, Sept. 1952; is worth looking up by those wishing to be set straight regarding the U.L. debate. _________________________________________________________________________________ [SIZE=11px]* Mainly, certain erroneous connections of the screen bypass capacitor from screen to earth, not cathode, of pentode stages (e.g. the Leak TL12 circuit and others). Secondly: The detailed description of the Sonab amplifier more follows fig.17 than fig.16, particularly regarding the input circuit (some component values in fig. 16 are wrong).[/SIZE] [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Tube based Audio amplifiers - web page
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