At mid frequencies too! Come to think of it, probably up to high frequncies as well! What a concept!
jan
Yes, there was a time I believed a lot of things based on reputation, authority and religion. Took me some time to start thinking for my self, but it's a great way to do things! You should try it sometime! 😉
jan
I got to play with a 1200F capacitor the other day, admittedly it was 2.7V but the impedance was amazingly low. I still say for a statement preamp batteries and filterbank/regulator are best.
No need for the Dogma Jan, I'm trying to find out where you are coming from and yes i have tried all you suggest and more, 30yrs plus of it playing around and i do think for myself , only results count. It's my experience most here are not exposed to really good hi-fi and hence shoot from the hip with text books and chemistry beacons, it's their way or the hi-way ...
Nothing to lose in exchanging view points and idea's ......
Nothing to lose in exchanging view points and idea's ......
We experimented with batteries, feeding a switching supply, batteries powering large inverter then conventional supply and straight batteries with filter bank reg as you suggest.
Straight batteries was least liked at the time .....
Yes if you use batteries there's probably no issue with oversized cap banks, the dischard is so minute and the charging relatively constant, very benign. That absence of narrow high charging pulses may be the best reason anyway for battery supplies.
Jan
No need for the Dogma Jan, I'm trying to find out where you are coming from and yes i have tried all you suggest and more, 30yrs plus of it playing around and i do think for myself , only results count. It's my experience most here are not exposed to really good hi-fi and hence shoot from the hip with text books and chemistry beacons, it's their way or the hi-way ...
Nothing to lose in exchanging view points and idea's ......
Even the ones with the really good hifi shoot from the hip, with little thinking ahead. That's my dogma.
Its better to engage brain before operating keyboard.
Jan
Less leave King Dogma out of this ....😀
The race is won by the swift , not the one with the best technique ..............
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So if a wide bandwidth transformer is not a desired quality in a power supply how do you limit the bandwidth to what you desire?
And besides a smps is there any way to make a normal linear power supply that slows the charging time so that you don't have as much power supply ripple? Is that even possible with a simple power supply and rectifier circuit with a capacitor bank?
It also appears that in an integrated amp/ pre-amp situation you would have to chose one optimization over the other, wouldn't you by necessity have to lean towards satisfying the power output over the preamp due to clipping and such in the power section?
And besides a smps is there any way to make a normal linear power supply that slows the charging time so that you don't have as much power supply ripple? Is that even possible with a simple power supply and rectifier circuit with a capacitor bank?
It also appears that in an integrated amp/ pre-amp situation you would have to chose one optimization over the other, wouldn't you by necessity have to lean towards satisfying the power output over the preamp due to clipping and such in the power section?
Twenty five years ago, I thought the same as Jan. AND I built my first Vendetta power supply with 1000uf caps and a 14 VA transformer, with a normal 1A full wave bridge. Who needed anything more?
Then I built, as I said previously, a larger supply for a popular Threshold preamp, commissioned by a customer to do so, in 1987. I built it, because I needed the work. I delivered the 'larger, and improved' power supply to the customer and left it there. It just so happens that the Threshold preamp had an XLR connector to supply the DC from the external power supply, so it was easy to change power supplies in a listening test.
Still, I ignored it, until I was at a CES and the customer asked me if I wanted to listen to the 2 power supplies, mine, and the original. I did not expect much. However, the difference was substantial, and this was confirmed by Gordon Holt, who immediately bought the improved power supply for his Threshold preamp, and I was assigned by the customer to build another. Now, you might think that this was a good thing, but after building a few power supplies, I ran out of spare parts, which made it much more expensive to build, if I was going to make an 'improved' power supply for another manufacturer's preamp. I really did not want the job.
Finally, Threshold, after initial complaints, similar to Jan's today, quietly made their OWN improved power supply, and I was let off the hook!
Now, my customer, also a Vendetta owner, reminded me that if a bigger and better power supply was better for the Threshold, it should also be better for the Vendetta. So my associate built the biggest power supply that we could fit in the existing power supply box. We went from 1K-2K to 7.5K caps, to a 30VA transformer, and dual 1A power supply bridges. It really was better, and removing the center tap got rid of a potential ground loop, as well. It was a learning experience. Years later, we upgraded the full wave bridges with discrete hi speed, soft recovery diodes and this became the D mod for existing Vendettas. Another significant improvement.
Then I built, as I said previously, a larger supply for a popular Threshold preamp, commissioned by a customer to do so, in 1987. I built it, because I needed the work. I delivered the 'larger, and improved' power supply to the customer and left it there. It just so happens that the Threshold preamp had an XLR connector to supply the DC from the external power supply, so it was easy to change power supplies in a listening test.
Still, I ignored it, until I was at a CES and the customer asked me if I wanted to listen to the 2 power supplies, mine, and the original. I did not expect much. However, the difference was substantial, and this was confirmed by Gordon Holt, who immediately bought the improved power supply for his Threshold preamp, and I was assigned by the customer to build another. Now, you might think that this was a good thing, but after building a few power supplies, I ran out of spare parts, which made it much more expensive to build, if I was going to make an 'improved' power supply for another manufacturer's preamp. I really did not want the job.
Finally, Threshold, after initial complaints, similar to Jan's today, quietly made their OWN improved power supply, and I was let off the hook!
Now, my customer, also a Vendetta owner, reminded me that if a bigger and better power supply was better for the Threshold, it should also be better for the Vendetta. So my associate built the biggest power supply that we could fit in the existing power supply box. We went from 1K-2K to 7.5K caps, to a 30VA transformer, and dual 1A power supply bridges. It really was better, and removing the center tap got rid of a potential ground loop, as well. It was a learning experience. Years later, we upgraded the full wave bridges with discrete hi speed, soft recovery diodes and this became the D mod for existing Vendettas. Another significant improvement.
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.
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