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Posts by kevin gilmore

So the bit about normal bias is not exactly true.   Back then when stax amps had both a regular and pro bias, the power supplies were limited to about +/-300 to +/-350V   So with a regular bias of about 260V, you could just barely with the volume cranked to the max overdrive the diaphragm. As any voltage swing that reverses the direction of the bias long term is a bad thing.   With some amplifiers these days with 500V power supplies, you can overdrive regular bias...
 I was referring to analog amplifier design. Digital amplifier design is getting better and better but at a fairly slow pace. Great for speakers especially power hungry ones, but unnecessary for headphone amplifiers. Dac design is moving ahead at lighting speed. Very hard to keep up. Stuff that was $30k+  is beaten up pretty bad by the next generation at $5k. And that generation is goingto get beat up pretty bad by the up and coming generation at less than $2k. DSD dacs...
​very carefully and with the appropriate high voltage attenuators.quantasylum qa401 works very well with input attenuators.
DIY was never about cheaper.  Well at least for many people. The market has matured.     1A   If they sell what you want and its a rational price then buy it.   1B   If they sell what you want, but the price is completely irrational, then if you can build it for a rational price with the same or         better performance, then build it.   Regardless of what anyone says, technology has not changed in the last 40 years.   2  dacs really are going to high density...
​1)  There is no such thing as NORMAL 2) the circlotron built with all emission labs 20B and all the extra stuff required to support them is $6k in tubes alone.  Probably close to $9K in parts 3) the all DHT amp which has not been published yet really is more than $18K in parts.
most of those are instrumentation pots and don't have stops at 0 or 360 degrees. you might end up with a surprise when you turn it past zero
RK50 vs P&G.   Roughly the same price, and roughly the same performance. I have a few of each.   A RK27 is a much cheaper mass market pot.
opamp input based amps (like o2) are going to clamp the audio signal when turned off to protect the chip. the solution seems obvious.
Not yet, but I expect to have a good listen soon.​ With the board space available on the plug in card, I expect that doing a native balanced dsd dac is going to be pretty easy. This could be the next big thing.
seriously, this should take you less than 10 minutes with a voltmeter to figure out.
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