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Audio and Video Talk
Valves / Vacuum Tubes
E80CF and a new phase-splitter
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<blockquote data-quote="Moonraker" data-source="post: 1088531" data-attributes="member: 24248"><p>Radford use the Bailey circuit. Their way of indicating capacitor values is really odd, but anyway the operation is clear from the Bailey schematic.</p><p></p><p>C6 is a decoupling cap and R8 is bias. The circuit is therefore a paraphase type, but with a pentode amplifier stage which introduces an asymmetry. The high overall NFB used in such a phase splitter (to ensure unity gain of the inverting stage) will tend to minimize any HF response advantages inherent in the pentode.</p><p></p><p>Maybe they got a stock of ECF80's cheaply.</p><p></p><p>The Dynaco circuit is simply a pentode amplifier followed by a 'concertina' type splitter. Not nearly the same thing, but using a similar tube type.</p></blockquote><p></p>
[QUOTE="Moonraker, post: 1088531, member: 24248"] Radford use the Bailey circuit. Their way of indicating capacitor values is really odd, but anyway the operation is clear from the Bailey schematic. C6 is a decoupling cap and R8 is bias. The circuit is therefore a paraphase type, but with a pentode amplifier stage which introduces an asymmetry. The high overall NFB used in such a phase splitter (to ensure unity gain of the inverting stage) will tend to minimize any HF response advantages inherent in the pentode. Maybe they got a stock of ECF80's cheaply. The Dynaco circuit is simply a pentode amplifier followed by a 'concertina' type splitter. Not nearly the same thing, but using a similar tube type. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
E80CF and a new phase-splitter
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