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In the Forum: Melquiades Amplifier
In the Thread: The Melquiades bass channels: the coupling capacitor.
Post Subject: more on the dc coupling schemePosted by cv on: 8/14/2007
If you study the above, you'll note that the topology involves some compromise, namely, a trade-off between a lower series resistor (for better drive of the following valve) versus a lower current draw through the CCS . This draw has to come through the anode resistor of the driver valve, so you either increase the HT, reduce the anode load resistor, or replace the anode load with some kind of active loading.
Oh - a 12AT7 is shown above cos that was already setup in the circuit package I used. Feel free to picture a 6e5p there if it helps.
Also, the CCS is showing -7mA cos I couldn't be bothered to flip the symbol around and type in +7mA...
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