Still they are publishing specifications that pertain to typical
audio performance, such as frequency response and THD. They can't
combine both quirkiness and normality.
Or can they?
Typical "I designed it that way because I could".
IMO it justifies disdain.
Le 20/02/2025 ¨¤ 16:55, John Woodgate a
¨¦crit?:
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I suspect that the weirdness is intentional.
Weird designs have existed from? the earliest day of DIY radio
receivers, before 'electronics'? was in the dictionary. I
recall a report of a circuit that had the 2 V lead-acid cell
apparently in series with the antenna circuit. Objective
performance measurements are typically not to be applied to
such designs. DO a web search for 'Bravo Audio reviews'.
On 2025-02-20 15:36, Jerry Lee Marcel
via groups.io wrote:
Le 20/02/2025 ¨¤ 15:27, Carlo a
¨¦crit?:
On Thu, Feb 20, 2025 at 05:40 AM, Andy I wrote:
There is some feedback from the audio signal
into the heater voltage. Was that intentional?? Or just an
undesirable side-effect?? I don't expect it would have
very much effect on the heater's temperature (and from
there to the triode's characteristics), but it looks
undesirable to me. Should there be filtering?
Sorry, are you asking whether the audio signal feedback into
the heater voltage comes from a design intentional choice ?
Actually I don't know since I took it from the schematic of
a commercial audio amplifier (Bravo Ocean).
It's extremely unlikely.
Heater temperature varies extremely slowly compared to audio
signals.
It could result in distortion at very very low frequencies,
definitely out of the audio band.
Now this design is weird from the start. Choosing to power a
tube circuit from 24VDC is a major flaw, unless the goal is to
create distortion.
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