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<blockquote data-quote="Ampdog" data-source="post: 624530" data-attributes="member: 144"><p>Fredep,</p><p></p><p>Very useful list that Millet one, BUT:</p><p></p><p>A casc<strong>a</strong>de topology is mentioned - that is not the same as casc<strong>o</strong>de. In cascode two valves are used in series (one on top of the other as it were). The anode voltage on the bottom one (going to the cathode of the top valve) is somewhere in the 60 - 70s, maintained by setting the top triode G1 at some 60 - 70Vdc. The top valve anode operates at some 150 - 200V, in series with the usual load resistor to B+.</p><p></p><p>Cascode triode connections exhibit pentode gains and characteristics. The figures given in that list rather suggest one valve with a CCS as anode load. The last entry for a 6SN7 with gain of some 100 would indeed suggest a cascode. (Eg. ECC88 triodes in cascode give a gain of some 150+ if memory serves.)</p></blockquote><p></p>
[QUOTE="Ampdog, post: 624530, member: 144"] Fredep, Very useful list that Millet one, BUT: A casc[b]a[/b]de topology is mentioned - that is not the same as casc[b]o[/b]de. In cascode two valves are used in series (one on top of the other as it were). The anode voltage on the bottom one (going to the cathode of the top valve) is somewhere in the 60 - 70s, maintained by setting the top triode G1 at some 60 - 70Vdc. The top valve anode operates at some 150 - 200V, in series with the usual load resistor to B+. Cascode triode connections exhibit pentode gains and characteristics. The figures given in that list rather suggest one valve with a CCS as anode load. The last entry for a 6SN7 with gain of some 100 would indeed suggest a cascode. (Eg. ECC88 triodes in cascode give a gain of some 150+ if memory serves.) [/QUOTE]
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