Straight batteries was least liked at the time .....![]()
Carefully designed no peeking DBT of course?

I have come to observe that there is no one answer, someone will hate any system that others might love.
I have two 500VA transformers for the 2 x 330W/4ohm amplifier. I started with two 300VA transformers for the prototype that measured 2 x 270W/4ohm.
Good if not driving lower than 4 ohm ....
Carefully designed no peeking DBT of course?
I have come to observe that there is no one answer, someone will hate any system that others might love.
Agree, but it was unanimous on the Batt supply only and split on the other setups, So yes very rare to get consensus in audio, hence why the decision on straight batteries was a surprise ...
Good if not driving lower than 4 ohm ....
I usually do not listen to sine waves at full swing, so then even for 2 ohm dips it is fine. Power just is not twice the power into 4 ohms.
Batteries are good, but a hassle to maintain.
Maintenance is not an issue, the soft laid back sound is .....
The engineering challenge is: To get the 'battery' sound from an AC outlet, without batteries. That is what I do for a living.
Maintenance is not an issue, the soft laid back sound is .....
have you ever tried doubling/tripling 🙂 ... With lead acid and pre/line stage duty behind a cap bank and regulator one could achieve voltage stiffness of micro-volts and ampage 1000X necessary.
For JC ------ From a research group in ACSP (Analog Circuits and Signal Processing --- (emphasis is mine)
"As normally happens in any area of research, the initial results are quit often derived intuitively which lead to systematic formulation of methodologies subsequently to enable the generation of all possible circuits belonging to a specific class."
THx-RNMarsh
"As normally happens in any area of research, the initial results are quit often derived intuitively which lead to systematic formulation of methodologies subsequently to enable the generation of all possible circuits belonging to a specific class."
THx-RNMarsh
What I find difficult to comprehend, is why people would go to the effort of oversized transformers and oversized reservoir capacitance, then realise they cause a spray of mains harmonics from the sharp, tall charging current pulses, then call up all kinds of chokes to migitate the oversized transformer and capacitance again.
To me that doesn't seem a very smart way to design your stuff, but probably I am missing something?
Jan
We will have to ask John et al on that one.
Reminds of the Naim (? IIRC) that had a 100VA transformer in one of their preamps when probably 15 VA would have done. I did not understand it.
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"As normally happens in any area of research, the initial results are quite often derived intuitively which lead to systematic formulation of methodologies subsequently to enable the generation of all possible circuits belonging to a specific class.


> a 100VA transformer in one of their preamps
> when probably 15 VA would have done.
> I did not understand it.
Perhaps if you had heard an A-B (15 VA vs 100 VA)
you would have understood why they did it
(even if not understanding the mechanism at work)
> when probably 15 VA would have done.
> I did not understand it.
Perhaps if you had heard an A-B (15 VA vs 100 VA)
you would have understood why they did it
(even if not understanding the mechanism at work)
Might be a good time to reference this ... http://emcesd.com/pdf/uesd99-w.pdf. This gives a flavour of the sort of thing I find is highly relevant, where some of the 'unknowns' may be lurking ...
Then guess whose designs have a cult following and are sought-after..Actually the consumer chooses 😉
Joachim's and my CTC Blowtorch uses 4 of these transformers:
John,
What rating ? 4x 36VA ?
Patrick
> a 100VA transformer in one of their preamps
> when probably 15 VA would have done.
> I did not understand it.
Perhaps if you had heard an A-B (15 VA vs 100 VA)
you would have understood why they did it
(even if not understanding the mechanism at work)
Yes, perhaps.
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