Re: Tube/valve amp kit question



Bret Ludwig wrote:

> Triode amps can work well but they tend to be quite expensive or a lot
> of trouble to get to work.

Triode amps are easy to get to work, but are more expensive
because the plate efficiency is lowest.
But they give better linearity than other types of tubes
at the same power; eg, trioded EL34 in triode will have less thd than
pure pentode at 10 watts.

> EL84's are terribly nonlinear and are poor
> choices for hi-fi (they work well in guitar amplifiers where people
> WANT distortion.)

EL84 are not any more non-linear than many other tubes, and they
can be VERY linear if set up right.

> And as far as single ended goes, no conventional
> single ended amp will provide true fidelity in full-range application.

It depends what you mean by conventional.
If you mean some old SE PA amp, sure, it may have poor response.

But unconventional SE amps be they triode or multigrid types
can provide true hi-fi that many find sounds second to none.

Its not hard to make an SE amp that has low Ro, thd below 1% at full po and
declining
with Vo, wide bandwidth from 10Hz to 65 kHz, -3dB,
and low noise.

Patrick Turner.



.

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