Yes, easily. Consider, for example, these two
amplifiers:
a) Output power 30 W, THD 0.1%
b) Output power 35 W, THD 5.2%
Which would you buy??
They are the same amplifier. Similar games are
played with signal-to-noise ratio and frequency response.
On 2025-02-20 16:05, Jerry Lee Marcel
via groups.io wrote:
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?:
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.
--
OOO - Own Opinions only If something is true: * as far as we
know - it's science *for certain - it's mathematics
*unquestionably - it's religion
--
OOO - Own Opinions only
If something is true:
* as far as we know - it's science
*for certain - it's mathematics
*unquestionably - it's religion
John Woodgate