Pro Audio Design Forum

You get cleaner results that frequently lack the original character that was chased in the first place.

Doug how would you describe the character that's lost?

Maybe that's the reason for R8 here with a bipolar input NJM4580: https://www.ka-electronics.com/images/jpg/Rane_HC6_Headphone_Amp_Output.jpg We pondered R8's raison d'etre here: http://www.proaudiodesignforum.com/forum/php/viewtopic.php?f=6&t=497&hilit=rane&start=22 I also went back and...

I found another place where Jung discusses source impedance balancing for voltage followers to reduce THD in the ADI 2002 Analog Seminar series. https://proaudiodesignforum.com/images/jpg/Jung_Source_Impedance_Balance.JPG Jung, Balancing source impedance in voltage followers to reduce THD. See: htt...

I wanted to point out that one difference I experienced in my first test vs. the "slightly lowered VA power supply" observations was that the "clipping" was not due to the output hitting the rails but simply (gracefully?) running out of current due to being severely under-biased ...

I've seen the technique (figure 25) in the AD797 (bipolar input) datasheet with an added Rs of 100R.

I'm not sure where but Jung writes about this as well.

Hey Craig thank you for joining us!

I've seen that in a number of Analog Devices datasheets (both BIFET and bipolar) and have tried it myself with OPA2604s and AD823s.
It does seem to work.

ricardo wrote: The really radical part of this design and one which will give it a distinct advantage in DBLTs is its regulated PSU. Yeah, I really need to order those 18VDC laptop switchers for the 10W project. My first tests were done with a regulated lab supply. My true golden pinnae panel had a ...

John - What do you make of the feed-forward error correction? In reading it I'm reminded of the Quad current dumping topology. I never seriously looked at what Quad did but what my understanding was is that it had a small amp to handle the zero crossover region and higher power dumpers in what I sup...

I was reading about Benchmark's new power amp and found this statement: Low Gain – The AHB2 has a low gain setting that optimizes the gain structure of professional monitoring systems. Maximum rated output is reached at an input signal level of 22 dBu. This places the upstream equipment in an ideal ...

Rail voltage is +/-32VDC and the Class-A quiescent current is 3.5A per rail

Ok, so it looks like Iq = Ipeak (50W, 8 Ohms).
And a 48VCT transformer looks to be a about right.

Thanks again for sharing this with us. I hope that you continue to pursue this and share your results.