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In Reply to: RE: Yes posted by drlowmu on August 23, 2016 at 12:33:04
An 11k amp is always overpriced and you probably help to pay the new Mercedes of somebody else...... Did i see a cheap EI transformer too?
Dc coupled is not a good idea, less reliable and there is always an electrolitic capaciter in the circuit path for bad sound. A normal capacitor is normally a lot better. If you want the bst is should have a 1:1 interstage to drive the powertube.
Follow Ups:
Lenin,
Respectfully, you are not well informed and not experienced in this.
But, ask yourself this : regarding coupling mechanisms :
HOW will a one-to-one interstage be better at signal transmission than three paralleled Cardas pure silver audio wires ( the direct couple mechanism )? How??
And please tell me, WHERE is there any electrolytic in such a circuit?
DC amps need not use an electrolytic, ones I make use 100% film caps everywhere !!
The amps are $15K for two monoblocks, last I saw, and READ all the user-reviews on it ( URL in my post above) obviously you have not !!
Jeff Medwin
If it is real dc coupled it should not have anywhere in the circuit a capacitor, not cathode de-coupling and not in the power supply. I doubt if you have a real dc amplifier, you have any schematic of it?Cardas silver is just a brand and just silver, nothing special to me. I have heared many fairytales about silver, silver can not do magic it is just in the mind of the person who uses it who thinks it dos magic. Btw silver is a "cheap" metal and cost less then $1/gram, even the cardas silver.
I also have heared many $10k amp/ loudspeakers and other top dollar equipment and i have never heared any of them worth the money. Some sounded really well but not worth that kind of money. It is mostly snobism.
A interstage has the best controle on the grid of the powertube.
But... If i see the work of Josh from Electronluv i will make an exception because its a peace of art if you look at it. (Not buying it for the sound)
Edits: 08/23/16
Thats incorrect.And also your comment about bias shift is also incorrect - it assumes too much, and negates certain developments (yeah I know, but I do these things).
Shane.
Edits: 08/31/16
"A interstage has the best controle on the grid of the powertube. "
Why is that?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
When using a interstage you have the possibility to have a rock solid bias because of the low dcr of the interstage. Of course you have to use a capable driver tube and use a stable fixed bias of the power tube otherwise you though away all the goods.....
Dc coupled tubes have drift ( not the best bias) and using capaciters for cathode decoupling is also not a good idea for the best performance.
An interstage can also provide for class 2, drive with grid current, if propper designed.
"...have a rock solid bias because of the low dcr of the interstage. "
I used to think that also but then someone explained that the grid current is not DC per se.
The grid current will start and stop periodically in accordance with the music signal that is causing it.
So now it is the reactance of the winding that comes into play, not the DCR.
A good grid choke (or the secondary winding of a good IT) will have a very high reactance, in many instances higher than the grid resistor that it replaced causing the bias to be less stable under class 2 conditions.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Grid current can only be there for very large signals where the grid of the powertube is driven in a postive grid signal. Then there is a much lower impedance so the driver has to be much more powerfull then normally. A normal circuit can't handle this but a powerfull driver+ interstage can.Remember this grid current is a very special situation where impedance is much different then normally so an interstage is still the best solution for a stable bias.
Edits: 08/25/16 08/25/16 08/25/16
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