Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics.

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As I said, it is not a simple C.F.

Posted by cheap-Jack (M) on February 22, 2006 at 12:31:56

In Reply to: Re: I never received any such article... posted by Mahatma Kane Jeeves on February 21, 2006 at 13:52:08:

Hi.

Per the link Tre' kindly posted, this a hi-teck cathode follower
involving the use of DC off-set servo controls, which can be a pain is not handled properly as it is right there shunting the I/P signal point.

From straightly technical view point, it is an awesome elaborated
C.F. How is the sound, anyway?

My first impression, without auditioning it, is too much SS stuffs involved & the use of a I/P iron is sort of defeating the basic concept of straight-line signal path. You can see the designer went the tedeous way of DC coupling without O/P coupling cap.

Strangely enough, I had zero idea that this C.F is I/P iron coupled. Yet I mentioned earlier about the problem of coupling properly such amp with its driver amp which most commonly come with O/P coupling capactor.

To get the best result particularly on the LF performance, an I/P iron coupled amp should not a stand-alone design. The O/P coupling cap of the driver amp, eg. phonostage or linestage, should be factored in the choice of the I/P iron of the C.F., i.e. various inductances available for the best coupling.

Given the chosen inductance of the I/P iron of the C.F, the O/P coupling cap of the driver amp should not be too samll to prevent LF bumps & transformer saturation effects, which would otherwise take toll on its sonic performance.

The designer of this C.F apparently did not worry too much on the choice of the I/P iron of the right inductances to match the upstream
driver amp.

c-J

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