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Hi everyone.

Sorry if I'm cluttering up your forum with baby questions, please feel free to redirect me elsewhere if this is an inappropriate request for help!

After building a few amps from kits & a power amp from a well-proven circuit diagram I'm ashamed to say that I feel my basic understanding of electronics theory is poor. Could you help me along a little bit, before I try anything more demanding?

I'm struggling to interpret the tube data sheet in terms of the circuit I want to power. I don't want to show you the circuit, as I want to work the answers out for myself, but I might ask you to check me after if you don't mind.

Firstly, how can I tell what class of operation this circuit is biased to operate in? I can work out the bias voltage from the cathode resistor x current, but what does this tell me?

Secondly, how can I calculate the total current draw of the circuit? Is anode current the only current flow? (I'm looking at triodes, so I think it is...?)

Finally, for a circuit not operating in class A, how does an amplifier cope with the constantly changing voltage HT? Does a non-class A circuit ideally need a regulated supply, or can you get adequate regulation from a bleeder resistor (or some other power supply design feature I've yet to even discover!)

Can anyone help me with this, or guide me to an online resource that may be of use? I'm off to buy a book or two this weekend, but from what I've seen they tend to be pitched at a level of understanding I have yet to attain. Also worried that my maths is not going to be up to this...

Many thanks
GPO




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Topic - Back to Basics - GPO 10:23:57 03/16/07 (1)


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