Too big a subject to tackle ...

Posted by Matt Rogers on December 21, 2004 at 15:10:54:

In Reply to: Re: Discussion on zero NFB ... posted by Lew on December 21, 2004 at 07:46:09:

Dear Lew

You said: "Without NFB, it may be the circuit itself that is "ringing" and losing bandwidth."

That must be a fantastic circuit.

Basically I disagree with you. I see "good" OPT as a device that should not reduce the bandwidth of the in-going signal, which is an impossibility due to losses. But I have seen OPT that can do 10Hz to 50 kHz well without NFB in a 200 watt tube amp. I also consider OPT as a neccesary evil. OTL as good as they are, has their own set of problems.

NFB is too often used as a cure. I admire designs that prevents rather than cure.

I do agree with you that some OPT can't take NFB at all due to oscillation, but that is another cattle of fish.

You said: "All of the above having been said, there are much more
knowledgable people than either of us .. " Does this mean that we should not say anything at all, Lew?

Cheers

Follow Ups:

• Re: Too big a subject to tackle ... - Lew 07:08:35 12/22/04 (0)

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