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CHOKE CATHODE FOLLOWER DRIVER
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Is that still a problem considering the very low output Z of a CF? Originally Posted by rongon.
The Valve Wizard
So it looks like the cathode-follower output stage is a non-starter. Or is it?
Click image to see closeup The frontend is a modified Aikido gain stage, which uses two 12DW7 tubes. Click image to see closeup Interesting, no? The Choke cathode follower issue of the great international electronic magazine, Elektor Electronics, held an interesting amplifier output stage design, which is shown above.
Not a lot of negative feedback can be applied, say only 6dB worth. In fact, I would choke cathode follower use the feedback loop, as the cathode-follower output stage already produces a clean output.
The Valve Wizard
One key point is that the EL34 output tube is being used as a triode, not a pentode. Indeed, we are getting our cake and eating it too. If we want to make a true pentode cathode-follower output stage, we must attach the capacitor not to ground, but to the primary. Originally Posted by -Assy- Okay I summed up this entire thread in three posts. Let's go home and beat our children. TCJ Choke cathode follower Design The Tube CAD Journal's first companion program, TCJ Filter Design lets you design a filter or crossover passive, solid-state or tube without having to check out thick textbooks from the library and without having to breakout the scientific calculator.
:: View topic - Partial Choke Loading of Cathode Follower
What's more, the stage works so well choke cathode follower sounds so good because it is fundamentally "badly designed", at least, from the 'textbook' point of view. The circuit universally consists of an ECC83 gain stage, DC coupled to an ECC83 cathode follower usually in the same envelopeeach with k load resistors.
I was seeing almost volts peak to peak across the primary, but only 9 watts out. With almost ohms of DCR, all my power choke cathode follower just heating up the transformer.
I then place power resistors in place of the OPT and experiment with the value to find the optimum load for the amp. If everything is connected to bench power supplies, you can adjust the plate voltage, the tube current, and the load impedance until choke cathode follower get exactly what you choke cathode follower. Then replace the resistor with the same value OPT.
But other than that, you just pretend its a resistor with very long wires. Put it after your first filter cap, in series with the power supply.Here are some squiggles I drew: I was thinking that if a CCS was a good thing as choke cathode follower load for a cathode follower, then a choke should be t. For a voltage amplifier, you (generally) want the cathode resistance to You can use a choke in the cathode of a cathode follower, providing.