All the above answers from 6L6, Tungsten, Mark Johnson, et al. are practical, but some want to go into the diminishing returns area. Naim Audio for exam;le has done alot with power supply improvements for example.
https://www.psaudio.com/blogs/pauls...are-equal-in-importance-to-amplifier-circuits
https://www.psaudio.com/blogs/pauls...are-equal-in-importance-to-amplifier-circuits
I do in fact agree with all of this, and a wise man once said, “The amplifier is nothing but an oscillator for the PSU.” So there’s absolutely merit to it.
In my experience, however, you’ll get more sonic differences and improvements by building another, different, amplifier, than twiddling with the power supply. (This is in no way implying that the VFET is bad in any way… just that different amps sound quite different, but PSUs sound quite similar.)
In my experience, however, you’ll get more sonic differences and improvements by building another, different, amplifier, than twiddling with the power supply. (This is in no way implying that the VFET is bad in any way… just that different amps sound quite different, but PSUs sound quite similar.)
I’ve tried several preamps w the amp, and it has the same signature sound w all of them. Just a bit thin…
Yeah, that was a scary execution with excessive glue over everything.
The articles were more interesting, specifically the importance of maintaining low impedance in the power supply. There are lots of ways of accomplishing this. Capacitance really is the answer. The trick is using the right sizes of capacitors to avoid inductive impedance, so a well executed supply should employ different sizes of caps to maintain a low impedance over a broad frequency range.
The articles were more interesting, specifically the importance of maintaining low impedance in the power supply. There are lots of ways of accomplishing this. Capacitance really is the answer. The trick is using the right sizes of capacitors to avoid inductive impedance, so a well executed supply should employ different sizes of caps to maintain a low impedance over a broad frequency range.
last time I looked (eons ago), I didn't found them having any ripple current capacity
maybe that changed, but I wouldn't be surprised calculating that some regular cap is giving better effective results in energy storage
You should be looking at the transformer which is included in the kit-of-all-parts sold by the diyAudio Store.
To find its manufacturer and part number, either check the circuit schematic diagrams designated by the Store (they are attached below) ...
or ...
Check the Detailed Parts Lists linked by the Store. You can answer your own question, two different ways. Have fun!!
_
To find its manufacturer and part number, either check the circuit schematic diagrams designated by the Store (they are attached below) ...
or ...
Check the Detailed Parts Lists linked by the Store. You can answer your own question, two different ways. Have fun!!
_
Last edited by a moderator:
For the audio transformer, @Mark Johnson is 100% correct and his advice is spot on.
The target is a PSU with 36VDC output.
When you rectify AC to DC the DC voltage will be 40% higher than the AC of the transformer. The diodes will steal about 1.5VDC, so for a rough example, a 20VAC transformer -
20 x 1.4 = 28
28 - 1.5 = 26.5VDC
And so forth. Using this you can determine what VAC power transformer you’ll need to build a linear PSU.
The target is a PSU with 36VDC output.
When you rectify AC to DC the DC voltage will be 40% higher than the AC of the transformer. The diodes will steal about 1.5VDC, so for a rough example, a 20VAC transformer -
20 x 1.4 = 28
28 - 1.5 = 26.5VDC
And so forth. Using this you can determine what VAC power transformer you’ll need to build a linear PSU.